Return air fan Zoning is the best thing you Air Handling Unit / AHU components The AHU supply unit consists of an intake section, panel, and bag filters, a mixing damper section, chilled water supplied cooling, and a supply fan. This addendum also adds a dynamic reset to S-R-DIFF, which is the airflow differential between supply air and return air fans required to maintain building pressure at desired pressure when using the Return Fan Tracking control option. Stat should not be near a supply vent that does that. Oct 1, 2024 ยท However, what stood out was that each AHU has a separate exhaust fan installed, functioning as a return fan for the AHUs. The return fan, which operates whenever the supply fan does, pulls return air from the occupied space and pressurizes the return air plenum at the air handler. Price and other details may vary based on product size and color. On larger high volume systems (air) it is difficult to naturally remove enough air from the conditioned space without the aid of a return fan to "pull" the air from the building fast enough to keep the building from over pressurizing while bringing in outside air. If any amount of ducted return air is used, then a return fan should be used. However, in my experience it is often unstable and leads to building static pressure problems, especially if two supply fans are being used with one return fan or vice versa. If cooler air pools around the thermostat, the AC will run less. adp zjk6u 87wqcu e0s0 w6rdz ykbayh 7rihz81 3a7lni qi0jxy i9tc