12/28/2023 0 Comments Cfm airflow in home![]() ![]() In the Jones home, these tests revealed that airflow was extremely unbalanced both upstairs and downstairs, and room to room. This offered a way to diagnose issues and improve airflow on a room-by-room basis. With these measurements, it was time to measure the airflow at each register. The furnace was located on the western side of the home’s basement. Air handler flow measured 536 CFM, and static pressure in the supply plenum was 0.53 in W.C. The home measured a good air tightness of 2.4 ACH50. The basement was mostly finished and conditioned, and the home’s walls and attic were well insulated. The first step in diagnosing the issue from an HVAC perspective was to gather measurements and observations about the 3,100-square-foot home, and test flow at each register. DIAGNOSING THE SOURCE OF COMFORT PROBLEMSĬomfort issues plagued the Jones family because their home was poorly balanced, even though their furnace and air conditioner were both functioning properly. This service can help improve customer satisfaction because new systems deliver air as promised, creating a positive return on investment for your customer and reducing the volume of callbacks for comfort issues. Residential registers also have lower airflow than commercial ones, which can be more difficult to measure.ĭespite these challenges, there’s an opportunity for residential HVAC companies to set themselves apart in the market by offering airflow balancing. This presents a key hurdle in residential testing because there is a wide variety of register shapes and sizes that need to be tested, and they are almost always smaller than typical commercial vents.Īccessing these registers is another obstacle, with crown molding, toe-kick and other placements making it difficult to achieve a good seal. ![]() Most hoods are designed for commercial applications with large 24-by-24-inch openings. The cost of equipment is only one part of the equation. There are a number of challenges that greet HVAC technicians who undertake airflow balancing. Airflow capture hoods are the recommended tools to gather flow measurements. The process starts with all dampers fully open to measure how much air each register delivers, then dampers are closed in rooms that are getting too much airflow relative to the required flow. Technicians open or close dampers based on how much airflow each register receives and what is needed to condition a room based on its load calculation. ![]()
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