![]() Quick Simple Check for Air Flow at Return RegistersĪ simple test for air movement at the return air inlet is illustrated in our sketch. ![]() Don't leave the door interlock switch bypassed or taped - doing so is dangerous.Īt BLOWER DOOR SWITCHES. Watch out: it may be necessary to temporarily tape or bypass a blower door compartment interlock switch to try this subjective test. So a certain amount of "pull" of air rushing into the blower that also wants to re-close the blower compartment door is normal. Watch out: don't leave the cover off of an air handler - it's potentially very dangerous, as we explainĪlso keep in mind that a properly-working air handler or blower assembly will always be running with negative air pressure in the blower compartment - otherwise it wouldn't be moving any air through the duct system. ![]() Really this is the best approach once you've eliminated very obvious mistakes like those listed Have the HVAC system examined by a professional:.Watch out: See our safety warnings just below. We have opened a cover just a few inches and released it to hear it slam with tremendous force against the blower cabinet when the system lacked adequate return air. If by opening the cover on a blower assembly or air handler unit you feel a dramatic increase in the airflow coming out of the building's air supply registers, then the system is probably return[-air starved. Temporarily or momentarily opening an air handler cover:.Such as holes cut into an existing return air duct, or worse, openings cut to admit more "makeup" air into the air handler from an un-conditioned space such as an attic or crawl area. Visual inspection for prior attempts to "improve" return air.Is the return air inlet size (length x width) smaller than the cross section of the air inlet end of the air handler or blower assembly? A mismatch in return air inlet grille or duct size will reduce the system's effectiveness. If there is only a single air return inlet, where is it located? Is the return isolated from some rooms in the building if the doors to those rooms are closed? Visual inspection for inadequate return air:.There are several easy and amateur ways to check for an air conditioning or warm air heating system that is not getting enough return air. Add More Return Air Inlets & DuctingĪdding additional return air inlets and ducts to increase airflow to the air handler is an effective way to improve air conditioning or or warm air heating system performance, provided that the system is in fact running "air starved". Here you will find a list of "Improvements" to "fix" inadequate return air ducts & airflow for air conditioners and furnaces addressing the blower and supply duct system. How to Check or Detect Air Flow at the Return Register Inlets. How to increase air conditioning or heating return air flow to improve system performance Return air adequacy on heating and air conditioning duct systems. How to Increase Return Air Flow or Supply in Heating or Air Conditioning Duct Systems We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. The photograph above shows a return air inlet grille for a commercial office space after theĪir conditioning return register and ducts were increased in size as part of improvements in the building cooling system. Inadequate return air seriously limits both air flow rates and also the degree to which building air is cooled (or heated) by the HVAC system. Problems with return air inlet size, location, and ductwork. How to increase HVAC system return air to increase heating or cool air output by improving the flow of return air to the air handler. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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