HVAC Dictionary – Precision Air Conditioning & Heating
Terms of Interest If You’re Curious About Comfort
Click the term to see the definition.
AC (Alternating Current)
Air Flow Volume:
Blower Door/Blower Door Fan:
An instrument used in Home Performance to help best identify the sources of air leakage in your home. A blower door consists of the door and the door fan. The door fan is nothing like a regular fan because it is a very powerful tool. The door fan is a specially designed, calibrated fan, which is temporarily mounted in the blower door that we set up inside the opening for one of the outer doors of your home. The fan is used to blow air into or out of a room, home, or building to measure the total air leakage of the location being tested.
A blower door fan works by establishing a pressure differential between the inside and the outside of an enclosure. The fan puts the home under positive or negative pressure (depending on the type of testing being done). The pressure difference forces air to leak through all of the holes in the thermal boundary of the location being tested. The amount of air that is required to maintain a constant pressure difference is equal to the amount of air that is leaking from the enclosure. A specially designed gauge is then used to measure the amount of air flowing through the Door Fan, and the pressure difference, which can be used to determine the total size of all the air leaks.
With the home under the pressure achieved through the blower door/blower fan, we then use a thermal imaging camera and tracer smoke to locate the areas of leakage so they can be sealed.
Building Performance Institute, Inc. (The):
Charging a System:
Dry Bulb Temperature:
Electronic Air Cleaner (EAC):
Gas Furnace Heat Exchanger:
High Efficiency Air Cleaner:
Using Home Performance guides us in: sealing air holes and gaps in the building envelope; adding insulation where needed; sealing ducts; adding heat recovery ventilation or other means to control and upgrade fresh air ventilation (if needed); and controlling moisture. Further, the Home Performance approach can identify whether it is appropriate to suggest upgrading the air conditioning and/or heating systems, appliances and/or lighting by replacing them with more energy efficient equipment such as ENERGY STAR rated appliances, devices, compact fluorescent lamps (CFL), or LED lamps.