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What is Air Duct Cleaning?
- Most people are now aware that indoor air pollution is an issue
- growing concern and increased visibility. Many companies are
- products and services intended to improve the quality of your
- air. You have probably seen an advertisement, received a coupon
- mail, or been approached directly by a company offering to clean
- air ducts as a means of improving your home's indoor air quality.
- services typically -- but not always -- range in cost from $450
- $1,000 per heating and cooling system, depending on the services
- offered, the size of the system to be cleaned, system accessibility,
- climatic region, and level of contamination.
- Duct cleaning generally refers to the cleaning of various heating
- cooling system components of forced air systems, including the
- and return air ducts and registers, grilles and diffusers, heat
- exchangers heating and cooling coils, condensate drain pans (drip
- fan motor and fan housing, and the air handling unit housing
- If not properly installed, maintained, and operated, these components
- may become contaminated with particles of dust, pollen or other
- If moisture is present, the potential for microbiological growth
- mold) is increased and spores from such growth may be released
- home's living space. Some of these contaminants may cause allergic
- reactions or other symptoms in people if they are exposed to
- you decide to have your heating and cooling system cleaned, it
- important to make sure the service provider agrees to clean all
- components of the system and is qualified to do so. Failure to
- component of a contaminated system can result in re-contamination
- entire system, thus negating any potential benefits. Methods
- cleaning vary, although standards have been established by industry
- associations concerned with air duct cleaning. Typically, a service
- provider will use specialized tools to dislodge dirt and other
- ducts, then vacuum them out with a high-powered vacuum cleaner.
- In addition, the service provider may propose applying chemical
- biocides, designed to kill microbiological contaminants, to the
- of the duct work and to other system components. Some service
- may also suggest applying chemical treatments (sealants or other
- encapsulants) to seal or cover the inside surfaces of the air
- equipment housings because they believe the sealant will control
- growth or prevent the release of dirt particles or fibers from
- These practices have yet to be fully researched and you should
- informed before deciding to permit the use of biocides or sealants
- your air ducts. They should only be applied, if at all, after
- has been properly cleaned of all visible dust or debris.
- Components of a Typical*
- Residential Heating and Cooling System
- Deciding Whether or Not to Have Your Air Ducts Cleaned
- Knowledge about the potential benefits and possible problems
of air duct
- cleaning is limited. Since conditions in every home are different,
- impossible to generalize about whether or not air duct cleaning
- home would be beneficial.
- If no one in your household suffers from allergies or unexplained
- symptoms or illnesses and if, after a visual inspection of the
- the ducts, you see no indication that your air ducts are contaminated
- with large deposits of dust or mold (no musty odor or visible
- growth), having your air ducts cleaned is probably unnecessary.
- normal for the return registers to get dusty as dust-laden air
- through the grate. This does not indicate that your air ducts
- contaminated with heavy deposits of dust or debris; the registers
- easily vacuumed or removed and cleaned.
- On the other hand, if family members are experiencing unusual
- unexplained symptoms or illnesses that you think might be related
- your home environment, you should discuss the situation with
- doctor. EPA has published Indoor Air Quality: An Introduction
- Professionals that can be obtained free of charge by contacting
- at the number listed in this guide. You may obtain another free
- booklet from IAQ INFO entitled The Inside Story: A Guide to Indoor
- Quality for guidance on identifying possible indoor air quality
- and ways to prevent or fix them.
- You may consider having your air ducts cleaned simply because
- logical that air ducts will get dirty over time and should occasionally
- be cleaned. While the debate about the value of periodic duct
- continues, no evidence suggests that such cleaning would be detrimental,
- provided that it is done properly.
- On the other hand, if a service provider fails to follow proper
- cleaning procedures, duct cleaning can cause indoor air problems.
- example, an inadequate vacuum collection system can release more
- dirt, and other contaminants than if you had left the ducts alone.
- careless or inadequately trained service provider can damage
- or heating and cooling system, possibly increasing your heating
- conditioning costs or forcing you to undertake difficult and
- repairs or replacements.
- You should consider having the air ducts in your home
- * There is substantial visible mold growth inside hard surface
- sheet metal) ducts or on other components of your heating and
- system. There are several important points to understand concerning
- mold detection in heating and cooling systems:
- > Many sections of your heating and cooling system may not
- accessible for a visible inspection, so ask the service provider
- to show you any mold they say exists.
- > You should be aware that although a substance may look like
- a positive determination of whether it is mold or not can be
- only by an expert and may require laboratory analysis for final
- confirmation. For about $50, some microbiology laboratories can
- tell you whether a sample sent to them on a clear strip of sticky
- household tape is mold or simply a substance that resembles it.
- > If you have insulated air ducts and the insulation gets
- moldy it cannot be effectively cleaned and should be removed
- replaced. If the conditions causing the mold growth in the first
- place are not corrected, mold growth will recur.
- > Ducts are infested with vermin, e.g. (rodents or insects);
- > Ducts are clogged with excessive amounts of dust and debris
- particles are actually released into the home from your supply
- Other Important Considerations...
- Duct cleaning has never been shown to actually prevent health
- Neither do studies conclusively demonstrate that particle (e.g.,
- levels in homes increase because of dirty air ducts or go down
- cleaning. This is because much of the dirt that may accumulate
- air ducts adheres to duct surfaces and does not necessarily enter
- living space. It is important to keep in mind that dirty air
- only one of many possible sources of particles that are present
- homes. Pollutants that enter the home both from outdoors and
- activities such as cooking, cleaning, smoking, or just moving
- cause greater exposure to contaminants than dirty air ducts.
- there is no evidence that a light amount of household dust or
- particulate matter in air ducts poses any risk to health.
- EPA does not recommend that air ducts be cleaned except on an
- basis because of the continuing uncertainty about the benefits
- cleaning under most circumstances. If a service provider or advertiser
- asserts that EPA recommends routine duct cleaning or makes claims
- its health benefits, you should notify EPA by writing to the
- listed at the end of this guidance. EPA does, however, recommend
- you have a fuel burning furnace, stove, or fireplace, they be
- for proper functioning and serviced before each heating season
- protect against carbon monoxide poisoning. Some research also
- that cleaning dirty cooling coils, fans and heat exchangers can
- the efficiency of heating and cooling systems. However, little
- exists to indicate that simply cleaning the duct system will
- your system's efficiency.
- If you think duct cleaning might be a good idea for your home,
- are not sure, talk to a professional. The company that services
- heating and cooling system may be a good source of advice. You
- want to contact professional duct cleaning service providers
- them about the services they provide. Remember, they are trying
- you a service, so ask questions and insist on complete and knowledgeable
- Suggestions for Choosing a Duct Cleaning Service Provider
- To find companies that provide duct cleaning services, check
- Pages under "duct cleaning" or contact the National Air Duct
- Association (NADCA) at the address and phone number in the information
- section located at the end of this guidance. Do not assume that
- cleaning service providers are equally knowledgeable and responsible.
- Talk to at least three different service providers and get written
- estimates before deciding whether to have your ducts cleaned.
- service providers come to your home, ask them to show you the
- contamination that would justify having your ducts cleaned.
- Do not hire duct cleaners who make sweeping claims about the
- benefits of duct cleaning -- such claims are unsubstantiated.
- hire duct cleaners who recommend duct cleaning as a routine part
- heating and cooling system maintenance. You should also be wary
- cleaners who claim to be certified by EPA. EPA neither establishes
- cleaning standards nor certifies, endorses, or approves duct
- Do not allow the use of chemical biocides or sealants unless
- understand the pros and the cons (See "Unresolved Issues of Duct
- Check references to be sure other customers were satisfied and
- experience any problems with their heating and cooling system
- Contact your county or city office of consumer affairs or local
- Business Bureau to determine if complaints have been lodged against
- of the companies you are considering.
- Interview potential service providers to ensure:
- * they are experienced in duct cleaning and have worked on systems
- * they will use procedures to protect you, your pets, and your
- from contamination; and
- * they comply with NADCA's air duct cleaning standards and, if
- ducts are constructed of fiber glass duct board or insulated
- internally with fiber glass duct liner, with the North American
- Insulation Manufacturers Association's (NAIMA) recommendations.
- Ask the service provider whether they hold any relevant state
- As of 1996, the following states require air duct cleaners to
- special licenses: Arizona, Arkansas, California, Florida, Georgia,
- Michigan and Texas. Other states may require them as well.
- If the service provider charges by the hour, request an estimate
- number of hours or days the job will take, and find out whether
- will be interruptions in the work. Make sure the duct cleaner
- will provide a written agreement outlining the total cost and
- the job before work begins.
- What to Expect From an Air Duct Cleaning Service Provider
- If you choose to have your ducts cleaned, the service provider
- * Open access ports or doors to allow the entire system to be
- and inspected.
- * Inspect the system before cleaning to be sure that there are
- asbestos-containing materials (e.g., insulation, register boots,
- etc.) in the heating and cooling system. Asbestos-containing
- materials require specialized procedures and should not be disturbed
- or removed except by specially trained and equipped contractors.
- * Use vacuum equipment that exhausts particles outside of the
- use only high-efficiency particle air (HEPA) vacuuming equipment
- the vacuum exhausts inside the home.
- * Protect carpet and household furnishings during cleaning.
- * Use well-controlled brushing of duct surfaces in conjunction
- contact vacuum cleaning to dislodge dust and other particles.
- * Use only soft-bristled brushes for fiberglass duct board and
- metal ducts internally lined with fiberglass. (Although flex
- also be cleaned using soft-bristled brushes, it can be more
- economical to simply replace accessible flex duct.)
- * Take care to protect the duct work, including sealing and
- re-insulating any access holes the service provider may have
- used so they are airtight.
- * Follow NADCA's standards for air duct cleaning and NAIMA's
- recommended practice for ducts containing fiber glass lining
- constructed of fiber glass duct board.
- How to Determine if the Duct Cleaner Did A Thorough Job
- A thorough visual inspection is the best way to verify the cleanliness
- of your heating and cooling system. Some service providers use
- photography to document conditions inside ducts. All portions
- system should be visibly clean; you should not be able to detect
- debris with the naked eye. Show the Post-Cleaning Consumer Checklist
- the service provider before the work begins. After completing
- ask the service provider to show you each component of your system
- verify that the job was performed satisfactorily.
- If you answer "No" to any of the questions on the checklist,
- indicate a problem with the job. Ask your service provider to
- any deficiencies until you can answer "yes" to all the questions
- Post-Cleaning Consumer Checklist Yes No
- Did the service provider obtain access to and clean the
- entire heating and cooling system, including ductwork and
- all components (drain pans, humidifiers, coils, and fans)?
- Has the service provider adequately demonstrated that duct
- work and plenums are clean? (Plenum is a space in which
- supply or return air is mixed or moves; can be duct,
- joist space, attic and crawl spaces, or wall cavity.)
- Is the heat exchanger surface visibly clean?
- Cooling Components
- Are both sides of the cooling coil visibly clean?
- If you point a flashlight into the cooling coil, does light
- shine through the other side? It should if the coil is clean.
- Are the coil fins straight and evenly spaced (as opposed to
- being bent over and smashed together)?
- Is the coil drain pan completely clean and draining properly?
- Are the blower blades clean and free of oil and debris?
- Is the blower compartment free of visible dust or debris?
- Is the return air plenum free of visible dust or debris?
- Do filters fit properly and are they the proper efficiency
- as recommended by HVAC system manufacturer?
- Is the supply air plenum (directly downstream of the air
- handling unit) free of moisture stains and contaminants?
- Metal Ducts
- Are interior ductwork surfaces free of visible debris?
- (Select several sites at random in both the return and
- supply sides of the system.)
- Fiber Glass
- Is all fiber glass material in good condition (i.e.,
- free of tears and abrasions; well adhered to underlying
- Access Doors
- Are newly installed access doors in sheet metal ducts
- attached with more than just duct tape (e.g., screws,
- rivets, mastic, etc.)?
- With the system running, is air leakage through access
- doors or covers very slight or non-existent?
- Air Vents
- Have all registers, grilles, and diffusers been firmly
- reattached to the walls, floors, and/or ceilings?
- Are the registers, grilles, and diffusers visibly clean?
- System Operation
- Does the system function properly in both the heating
- and cooling modes after cleaning?
- How to Prevent Duct Contamination
- Whether or not you decide to have the air ducts in your home
- committing to a good preventive maintenance program is essential
- minimize duct contamination.
- To prevent dirt from entering the system:
- * Use the highest efficiency air filter recommended by the manufacturer
- of your heating and cooling system.
- * Change filters regularly.
- * If your filters become clogged, change them more frequently.
- * Be sure you do not have any missing filters and that air cannot
- bypass filters through gaps around the filter holder.
- * When having your heating and cooling system maintained or checked
- other reasons, be sure to ask the service provider to clean cooling
- coils and drain pans.
- * During construction or renovation work that produces dust in
- home, seal off supply and return registers and do not operate
- heating and cooling system until after cleaning up the dust.
- * Remove dust and vacuum your home regularly. (Use a high efficiency
- vacuum (HEPA) cleaner or the highest efficiency filter bags your
- vacuum cleaner can take. Vacuuming can increase the amount of
- the air during and after vacuuming as well as in your ducts).
- * If your heating system includes in-duct humidification equipment,
- sure to operate and maintain the humidifier strictly as recommended
- by the manufacturer.
- To prevent ducts from becoming wet:
- Moisture should not be present in ducts. Controlling moisture
- most effective way to prevent biological growth in air ducts.
- Moisture can enter the duct system through leaks or if the system
- been improperly installed or serviced. Research suggests that
- condensation (which occurs when a surface temperature is lower
- dew point temperature of the surrounding air) on or near cooling
- of air conditioning units is a major factor in moisture contamination
- the system. The presence of condensation or high relative humidity
- important indicator of the potential for mold growth on any type
- duct. Controlling moisture can often be difficult, but here are
- steps you can take:
- * Promptly and properly repair any leaks or water damage.
- * Pay particular attention to cooling coils, which are designed
- remove water from the air and can be a major source of moisture
- contamination of the system that can lead to mold growth. Make
- the condensate pan drains properly. The presence of substantial
- standing water and/or debris indicates a problem requiring immediate
- attention. Check any insulation near cooling coils for wet spots.
- * Make sure ducts are properly sealed and insulated in all
- non-air-conditioned spaces (e.g., attics and crawl spaces). This
- help to prevent moisture due to condensation from entering the
- and is important to make the system work as intended. To prevent
- water condensation, the heating and cooling system must be properly
- * If you are replacing your air conditioning system, make sure
- unit is the proper size for your needs and that all ducts are
- at the joints. A unit that is too big will cycle on an off
- frequently, resulting in poor moisture removal, particularly
- with high humidity. Also make sure that your new system is designed
- to manage condensation effectively.
- Unresolved Issues of Duct Cleaning
- Does duct cleaning prevent health problems?
- The bottom line is: no one knows. There are examples of ducts
- become badly contaminated with a variety of materials that may
- risks to your health. The duct system can serve as a means to
- these contaminants throughout a home. In these cases, duct cleaning
- make sense. However, a light amount of household dust in your
- is normal. Duct cleaning is not considered to be a necessary
- yearly maintenance of your heating and cooling system, which
- regular cleaning of drain pans and heating and cooling coils,
- filter changes and yearly inspections of heating equipment. Research
- continues in an effort to evaluate the potential benefits of
- In the meantime...
- * Educate yourself about duct cleaning by contacting some or
all of the
- sources of information listed at the end of this publication
- asking questions of potential service providers.
- Are duct materials other than bare sheet metal ducts more likely
- contaminated with mold and other biological contaminants?
- You may be familiar with air ducts that are constructed of sheet
- However, many modern residential air duct systems are constructed
- fiber glass duct board or sheet metal ducts that are lined on
- with fiber glass duct liner. Since the early 1970's, a significant
- increase in the use of flexible duct, which generally is internally
- lined with plastic or some other type of material, has occurred.
- of insulated duct material has increased due to improved temperature
- control, energy conservation, and reduced condensation. Internal
- insulation provides better acoustical (noise) control. Flexible
- very low cost. These products are engineered specifically for
- ducts or as ducts themselves, and are tested in accordance with
- standards established by Underwriters Laboratories (UL), the
- Society for Testing and Materials (ASTM), and the National Fire
- Protection Association (NFPA).
- Many insulated duct systems have operated for years without supporting
- significant mold growth. Keeping them reasonably clean and dry
- generally adequate. However, there is substantial debate about
- porous insulation materials (e.g., fiber glass) are more prone
- microbial contamination than bare sheet metal ducts. If enough
- moisture are permitted to enter the duct system, there may be
- significant difference in the rate or extent of microbial growth
- internally lined or bare sheet metal ducts. However, treatment
- contamination on bare sheet metal is much easier. Cleaning and
- with an EPA-registered biocide are possible. Once fiberglass
- is contaminated with mold, cleaning is not sufficient to prevent
- regrowth and there are no EPA-registered biocides for the treatment
- porous duct materials. EPA, NADCA, and NAIMA all recommend the
- replacement of wet or moldy fiber glass duct material.
- In the meantime...
- Experts do agree that moisture should not be present in ducts
- moisture and dirt are present, the potential exists for biological
- contaminants to grow and be distributed throughout the home.
- moisture is the most effective way to prevent biological growth
- types of air ducts.
- * Correct any water leaks or standing water.
- * Remove standing water under cooling coils of air handling units
- making sure that drain pans slope toward the drain.
- * If humidifiers are used, they must be properly maintained.
- * Air handling units should be constructed so that maintenance
- personnel have easy, direct access to heat exchange components
- drain pans for proper cleaning and maintenance.
- * Fiber glass, or any other insulation material that is wet or
- moldy (or if an unacceptable odor is present) should be removed
- replaced by a qualified heating and cooling system contractor.
- * Steam cleaning and other methods involving moisture should
- used on any kind of duct work.
- Should chemical biocides be applied to the inside of air ducts?
- Air duct cleaning service providers may tell you that they need
- a chemical biocide to the inside of your ducts to kill bacteria
- and fungi (mold) and prevent future biological growth. Some duct
- cleaning service providers may propose to introduce ozone to
- biological contaminants. Ozone is a highly reactive gas that
- regulated in the outside air as a lung irritant. However, there
- considerable controversy over the necessity and wisdom of introducing
- chemical biocides or ozone into the duct work.
- Among the possible problems with biocide and ozone application
- * Little research has been conducted to demonstrate the effectiveness
- of most biocides and ozone when used inside ducts. Simply spraying
- otherwise introducing these materials into the operating duct
- may cause much of the material to be transported through the
- and released into other areas of your home.
- * Some people may react negatively to the biocide or ozone, causing
- adverse health reactions.
- Chemical biocides are regulated by EPA under Federal pesticide
- product must be registered by EPA for a specific use before it
- legally used for that purpose. The specific use(s) must appear
- pesticide (e.g., biocide) label, along with other important information.
- It is a violation of federal law to use a pesticide product in
- manner inconsistent with the label directions.
- A small number of products are currently registered by EPA specifically
- for use on the inside of bare sheet metal air ducts. A number
- products are also registered for use as sanitizers on hard surfaces,
- which could include the interior of bare sheet metal ducts. While
- such products may be used legally inside of unlined ducts if
- directions are followed, some of the directions on the label
- inappropriate for use in ducts. For example, if the directions
- "rinse with water", the added moisture could stimulate mold growth.
- All of the products discussed above are registered solely for
- purpose of sanitizing the smooth surfaces of unlined (bare) sheet
- ducts. No products are currently registered as biocides for use
- glass duct board or fiber glass lined ducts, so it is important
- determine if sections of your system contain these materials
- permitting the application of any biocide.
- In the meantime...
- Before allowing a service provider to use a chemical biocide
- duct work, the service provider should:
- * Demonstrate visible evidence of microbial growth in your duct
- Some service providers may attempt to convince you that your
- ducts are contaminated by demonstrating that the microorganisms
- in your home grow on a settling plate (i.e., petri dish). This
- inappropriate. Some microorganisms are always present in the
- some growth on a settling plate is normal. As noted earlier,
- expert can positively identify a substance as biological growth
- lab analysis may be required for final confirmation. Other testing
- methods are not reliable.
- * Explain why biological growth cannot be removed by physical
- such as brushing, and further growth prevented by controlling
- If you decide to permit the use of a biocide, the service provider
- * Show you the biocide label, which will describe its range of
- * Apply the biocide only to un-insulated areas of the duct system
- proper cleaning, if necessary to reduce the chances for regrowth
- * Always use the product strictly according to its label instructions.
- While some low toxicity products may be legally applied while
- of the home are present, you may wish to consider leaving the
- while the biocide is being applied as an added precaution.
- Do sealants prevent the release of dust and dirt particles into
- Manufacturers of products marketed to coat and seal duct surfaces
- that these sealants prevent dust and dirt particles inside air
- from being released into the air. As with biocides, a sealant
- applied by spraying it into the operating duct system. Laboratory
- indicate that materials introduced in this manner tend not to
- coat the duct surface. Application of sealants may also affect
- acoustical (noise) and fire retarding characteristics of fiber
- lined or constructed ducts and may invalidate the manufacturer's
- Questions about the safety, effectiveness and overall desirability
- sealants remain. For example, little is known about the potential
- toxicity of these products under typical use conditions or in
- they catch fire.
- In addition, sealants have yet to be evaluated for their resistance
- deterioration over time which could add particles to the duct
- In the meantime...
- Most organizations concerned with duct cleaning, including EPA,
- NAIMA, and the Sheet Metal and Air Conditioning Contractors'
- Association (SMACNA) do not currently recommend the routine use
- sealants in any type of duct. Instances when the use of sealants
- appropriate include the repair of damaged fiber glass insulation
- combating fire damage within ducts. Sealants should never be
used on wet
- duct liner, to cover actively growing mold, or to cover debris
- ducts, and should only be applied after cleaning according to
- other appropriate guidelines or standards.
- To Learn More About Indoor Air Quality
- U.S. Environmental Protection Agency
- Office of Radiation and Indoor Air
- Indoor Environments Division
- (6604J) 401 M St., S.W.
- Washington, DC 20460
- (202) 564-9370
- (202) 565-2038 (fax)
- E-mail: firstname.lastname@example.org
- World Wide Web Site: http://www.epa.gov/iaq/
- Indoor Air Quality Information Clearinghouse (IAQ INFO)
- P.O. Box 37133
- Washington, DC 20013-7133
- 1 (800) 438-4318
- (202) 484-1307
- E-mail: IAQINFO@aol.com
- Useful EPA publications available free of charge from either
- The Inside Story: A Guide to Indoor Air Quality
- Indoor Air Pollution: An Introduction for Health Professionals
- Residential Air Cleaning Devices: A Summary of Available Information
- Consumer Research Council (CRC) IAQ Checklist
- P.O. Box 12099
- Washington, DC 20005-0999
- Ask for: How Healthy Is The Air In Your Home?
- (Free. Send a self-addressed, stamped standard size business
- To Learn More About Air Duct Cleaning
- National Air Duct Cleaners Association (NADCA)
- 1518 K Street, NW Suite 503
- Washington, DC 20005
- (202) 737-2926
- Ask for: Introduction to HVAC (Heating, Ventilating, and Air
- Conditioning) System Cleaning Services (Although intended for
- customers, information can be useful to consumers.)
- North American Insulation Manufacturers Association (NAIMA)
- 44 Canal Center Plaza,
- Suite 310
- Alexandria, VA 22314
- (703) 684-0084
- Ask for: Cleaning Fibrous Glass Insulated Air Duct Systems; Recommended
- Other Useful Resources
- For a free list of state and local consumer protection agencies
- Better Business Bureaus:
- Consumer's Resource Handbook
- Consumer Information Center
- Pueblo, CO 81009
- For Information on Antimicrobial Biocides:
- National Antimicrobial Information Network (NAIN)
- 1 (800) 447-6349.
- Email: email@example.com
- Consumer Checklist
- Learn as much as possible about air duct cleaning before you
- have your ducts cleaned by reading this guidance and contacting
- sources of information provided.
- Consider other possible sources of indoor air pollution first
- suspect an indoor air quality problem exists in your home.
- Have your air ducts cleaned if they are visibly contaminated
- substantial mold growth, pests or vermin, or are clogged with
- substantial deposits of dust or debris.
- Ask the service provider to show you any mold or other biological
- contamination they say exists. Get laboratory confirmation of
- growth or decide to rely on your own judgement and common sense
- evaluating apparent mold growth.
- Get estimates from at least three service providers.
- Check references.
- Ask the service provider whether he/she holds any relevant state
- licenses. As of 1996, the following states require air duct cleaners
- hold special licenses: Arizona, Arkansas, California, Florida,
- Michigan and Texas. Other states may also require licenses.
- Insist that the service provider give you knowledgeable and complete
- answers to your questions.
- Find out whether your ducts are made of sheet metal, flex duct,
- constructed of fiber glass duct board or lined with fiber glass
- the methods of cleaning vary depending on duct type. Remember,
- combination of these elements may be present.
- Permit the application of biocides in your ducts only if necessary
- control mold growth and only after assuring yourself that the
- will be applied strictly according to label directions. As a
- you and your pets should leave the premises during application.
- Do not permit the use of sealants except under unusual circumstances
- where other alternatives are not feasible.
- Make sure the service provider follows the National Air Duct
- Association's (NADCA) standards and, if the ducts are constructed
- flex duct, duct board, or lined with fiber glass, the guidelines
- North American Insulation Manufacturers Association (NAIMA).
- Commit to a preventive maintenance program of yearly inspections
- heating and cooling system, regular filter changes, and steps
- moisture contamination.