While the debate about the value of periodic duct cleaning continues, no evidence suggests that such cleaning would be detrimental, provided that it is done properly. Bottom line: Don't panic if you have a heat pump and if cold air blows out of your duct work for a little while on and off while you run your heat at home. To find companies that provide duct cleaning services, check your Yellow Pages under "duct cleaning" or contact the National Air Duct Cleaners Association (NADCA) at the address and phone number in the information section located at the end of this guidance. This is because much of the dirt in air ducts adheres to duct surfaces and does not necessarily enter the living space. All of the products discussed above are registered solely for the purpose of sanitizing the smooth surfaces of unlined (bare) sheet metal ducts. Manufacturers of products marketed to coat and encapsulate duct surfaces claim that these sealants prevent dust and dirt particles inside air ducts from being released into the air. Take care to protect the duct work, including sealing and re-insulating any access holes the service provider may have made or used so they are airtight. 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. If you have a restrictive duct system, you could reduce the air flow enough to freeze the evaporator coil, burn out the compressor, or crack the heat exchanger. Moreover, there is no evidence that a light amount of household dust or other particulate matter in air ducts poses any risk to your health. EPA does, however, recommend that if you have a fuel burning furnace, stove or fireplace, they be inspected for proper functioning and serviced before each heating season to protect against carbon monoxide poisoning. Most often this air will feel cold when the fan is “on” but if you don’t notice a change in your overall home’s temperature most likely this is just blowing out room temperature air. Insist that the service provider give you knowledgeable and complete answers to your questions. Whether or not you decide to have the air ducts in your home cleaned, preventing water and dirt from entering the system is the most effective way to prevent contamination (see How to Prevent Duct Contamination). A cleaning could make the difference between a satisfied client and a sour one. Should You Have the Air Ducts in Your Home Clenaed? If not properly installed, maintained and operated, these components may become contaminated with particles of dust, pollen or other debris. Most often, he won’t know for sure until he squints his eyes and turns the unit on. Remember, a combination of these elements may be present. Prior to any cleaning, retrofitting, or replacing of your ducts, the cause or causes must be corrected or else the problem will likely recur. Bottom line: Don't panic if you have a heat pump and if cold air blows out of your duct … Factors such as adhesion (how easily the dirt sticks to the duct) or fan power can determine how much the particles stack up in the ductwork before they come out. To prevent water condensation, the heating and cooling system must be properly insulated. Pay particular attention to cooling coils, which are designed to remove water from the air and can be a major source of moisture contamination of the system that can lead to mold growth. The thermostat is set to “on” rather than “auto” When your thermostat is set to “on”, the fan in your … To prevent dirt from entering the system: Use the highest efficiency air filter recommended by the manufacturer of your heating and cooling system. However, a light amount of household dust in your air ducts is normal. A fairly large, stiff-bristle paintbrush is … For example, if the directions indicate "rinse with water", the added moisture could stimulate mold growth. Once fiberglass duct liner is contaminated with mold, cleaning is not sufficient to prevent re-growth and there are no EPA-registered biocides for the treatment of porous duct materials. Find a NADCA professional duct cleaner near you. Again, regular AC maintenance is one of the best ways to prevent problems like air conditioner vents not blowing in one room of your house. If moisture is present, the potential for microbiological growth (e.g., mold) is increased and spores from such growth may be released into the home's living space. Are newly installed access doors in sheet metal ducts attached with more than just duct tape (e.g., screws, rivets, mastic, etc.)? Is the return air plenum free of visible dust or debris? Air duct cleaning service providers may tell you that they need to apply a chemical biocide to the inside of your ducts to kill bacteria (germs) and fungi (mold), and prevent future biological growth. Get estimates from at least three service providers. A licensed and experienced HVAC … Learn as much as possible about air duct cleaning before you decide to have your ducts cleaned by reading this guidance and contacting the sources of information provided. To find out … If you determine or suspect that there is mold growth, a rodent or insect infestation, or dust making its way into your home through your air ducts, or if you're worried about consistent … As noted earlier, only an expert can positively identify a substance as biological growth and lab analysis may be required for final confirmation. No. (rodents or insects). $1500 for pleasant smelling spray in air ducts (mold remediation) and 3 year service agreement. Do not allow the use of chemical biocides or chemical treatments unless you fully understand the pros and the cons (See "Unresolved Issues of Duct Cleaning). $1500 for pleasant smelling spray in air ducts (mold remediation) and 3 year service agreement. While the targeted use of chemical biocides and sealants may be appropriate under specific circumstances, research has not demonstrated their effectiveness in duct cleaning or their potential adverse health effects. If you point a flashlight into the cooling coil, does light shine through the other side? Everything was fine until the air conditioner came on. Phone: (703) 684-0084 As the air moves through the duct, it encounters a reducer and then a smaller duct.What do we know about the flow here? Can You Use A Pressure Washer to Clean Dirty Gutters? It depends on how dirty the ductwork is and how much particulate is loose (and how fine your cheesecloth is). Most experienced contractors have seen dirt in ductwork an inch deep or more. Website: Regulating Antimicrobial Pesticides. Cold air return blowing cold air - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. We’ve seen these dust explosions occur in houses, in operating rooms, and in the president’s office of the largest medical center west of the Mississippi—all over the boss’s $2000.00 suit. Contact your county or city office of consumer affairs or local Better Business Bureau to determine if complaints have been lodged against any of the companies you are considering. Educate yourself about duct cleaning by contacting some or all of the sources of information listed at the end of this publication and asking questions of potential service providers. If any of the conditions identified above exists, it usually suggests one or more underlying causes. It seems cold air is now blowing out of the intake vent and hot air is blowing out of the vents. Save Share. It might be something else. How to Check Furnace Ducts for Blockage 1. Protect carpet and household furnishings during cleaning. E-mail: info@nadca.com A careless or inadequately trained service provider can damage your ducts or heating and cooling system, possibly increasing your heating and air conditioning costs or forcing you to undertake difficult and costly repairs or replacements. These cover interpretation laws, rules and regulations, and registration and re-registration of antimicrobial chemicals and products. Duct cleaning has never been shown to actually prevent health problems. So you will feel air blowing through your vents but the air is not heated or cooled by your furnace system. Whatever the cause, once a duct system It has been proven by many reputable sources that air duct cleaning is necessary to improve indoor air quality. Since conditions in every home are different, it is impossible to generalize about whether or not air duct cleaning in your home would be beneficial. Little research has been conducted to demonstrate the effectiveness of most biocides and ozone when used inside ducts. All over her paintings. Knowledge about the potential benefits and possible problems of air duct cleaning is limited. This will help to prevent moisture due to condensation from entering the system and is important to make the system work as intended. The use of insulated duct material has increased due: Internal insulation provides better acoustical (noise) control. If the disconnected or leaky ductwork is in an unconditioned dusty area like an attic, it will suck up the … We had a client, a college, which experienced the shower of particles every Monday morning after the HVAC system had lain quiet -over the weekend. On 1st service call (6 months later), they tried again to upsell. If you do decide to have your air ducts cleaned, take the same consumer precautions you normally would in assessing the service provider's competence and reliability. All over her beautiful carpet. Ducts don't make much noise on their own. If your filters become clogged, change them more frequently. Make sure the duct cleaner you choose will provide a written agreement outlining the total cost and scope of the job before work begins. ... causing the rivots to pop out. Air duct cleaning service providers may tell you that they need to apply chemical biocide to the inside of your ducts as a means to kill bacteria (germs) and fungi (mold) and prevent future biological growth. (Select several sites at random in both the return and supply sides of the system.). During construction or renovation work that produces dust in your home, seal off supply and return registers and do not operate the heating and cooling system until after cleaning up the dust. Other states may also require licenses. Consult an HVAC Professional. Use well-controlled brushing of duct surfaces in conjunction with contact vacuum cleaning to dislodge dust and other particles. Cleaning and treatment with an EPA-registered biocide are possible. (ORIGINALLY PUBLISHED IN THE AIR CONDITIONING NEWS). Are you still getting cold air from your furnace? RV A/C Blowing Styrofoam From The Ceiling Ducts. RV A/C Blowing Styrofoam From The Ceiling Ducts. When the fan begins to blow, check all of the vents in... 2. Ducts are infested with vermin, e.g. Do not assume that all duct cleaning service providers are equally knowledgeable and responsible. This simple process, regardless of what type of fuel you use, is how your furnace is … You may have a closed damper that’s blocking … Sign 1: Dust blowing out the supply grates. Controlling moisture is the most effective way to prevent biological growth in all types of air ducts. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. Now those noisy air ducts are intruding on your solitude. Phone: (703) 308-0127 / Fax: (703) 308-6467 Pollutants that enter the home both from outdoors and indoor activities such as cooking, cleaning, smoking, or just moving around can cause greater exposure to contaminants than dirty air ducts. Neither do studies conclusively demonstrate that particle (e.g., dust) levels in homes increase because of dirty air ducts or go down after cleaning. Using a damp microfiber cloth, reach into the duct as far as you can and wipe the … Whether of not you decide to have the air ducts in your home cleaned, committing to a good preventive maintenance program is essential to minimize duct contamination. In addition, sealants have yet to be evaluated for their resistance to deterioration over time which could add particles to the duct air. Moreover, there is no evidence that a light amount of household dust or other particulate matter in air ducts poses any risk to health. Everything was fine until the air conditioner came on. If you think duct cleaning might be a good idea for your home, but you are not sure, talk to a professional. You may also want to contact professional duct cleaning service providers and ask them about the services they provide. This constant problem of “dirt blowing out” is normally simply a very dirty duct system which needs cleaning. These services typically — but not always — range in cost from $450 to $1,000 per heating and cooling system, depending on: They may also propose the application of a "sealant" to prevent dust and dirt particles from being released into the air or to seal air leaks. Monday-Friday 8:00 AM - 5:00 PM EST It can force infected mucous into the lacrimal duct and eye, spreading infection. Sealing duct air leaks can help save energy on heating and cooling bills. While the vent covers dry, insert the dryer vent brush into the duct as far … Use vacuum equipment that exhausts particles outside of the home or use only high-efficiency particle air (HEPA) vacuuming equipment if the vacuum exhausts inside the home. But this is not a good idea. Some duct cleaning service providers may propose to introduce ozone to kill biological contaminants. Send Us a Message or Call Us Now! Sealants should never be used on wet duct liner, to cover actively growing mold, or to cover debris in the ducts, and should only be applied after cleaning according to NADCA or other appropriate guidelines or standards. Laurel, NJ  08054 1200 Pennsylvania Avenue, N.W. A number of products are also registered for use as sanitizers on hard surfaces, which could include the interior of bare sheet metal ducts.