A blower door is a powerful fan that is affixed into a door frame to the exterior and pulls air out of your home. This lowers the inside air pressure and increased outside air pressure flows through any cracks or openings. An energy audit may include using a smoke pencil to air leak detection with a blower door test. A blower door test is a diagnostic procedure performed by a certified professional to identify air leakage in a building. The test simulates a 20-mile-per-hour wind blowing on the top, the bottom, and all sides of a home or building. Wherever air can enter through gaps, cracks, or other voids, it will. The blower door test is an important tool
Channel B of the DG-700 is actually measuring a pressure at the flow sensor of the fan and converting the pressure to flow based on the Devise and Configuration settings on the gauge. Appendix B of the blower door manual has Flow Conversion Charts that allow you to determine what fan pressure the gauge was reading during the test.
Step 4: Turn off thermostats, air conditioners and fans. After taking care of your windows and doors, the thermostat must be turned down. The blower door sucks air out of your home to create an increase in air movement. If your heater is on, it will increase the amount of air being pulled out. Also, any air conditioners or fans must be turned
A blower door is a tool that depressurizes a house; this depressurization exaggerates the home’s air leaks, making the leaks easier to measure and locate. An energy-efficient house must be as airtight as possible. Many older U.S. homes are so leaky that a third to a half of the home’s heat loss comes from air leaks. A blower door test is a simple yet crucial step for homeowners seeking to improve their home’s energy efficiency. By identifying and addressing air leakage, you can significantly reduce your energy consumption and enjoy a more comfortable living space. The blower fan starts when the fan limit switch turns it on. When the temperature dial on the fan limit switch has rotated enough to represent a pre-set temperature (the FAN-ON temperature setting) the the fan limit switch turns on the furnace blower fan. The blower fan moves warm air into the occupied space.

The maximum air leakage rate for any dwelling unit under any compliance path shall not exceed 4.0 air changes per hour - 4ACH Testing shall be conducted with a blower door test at a test pressure of 0.2 inches w.g. (50 Pa). Exception: Additions tested with the existing home having a combined maximum air leakage rate of 7 air changes per hour.

How Does a Blower Door Test Work? A blower door is a diagnostic tool that includes a powerful, variable-speed fan, an air pressure gauge, an adjustable frame, and a flexible fabric panel. During the test, the fan is mounted inside the frame of a central exterior door, like your front entry door, and the panel is used to cover the open doorway.
Door vents can also be used to manage airflow. The Blower Door Test measures flow out of the building and can be used to measure flow between sections of the building. Windows Windows are over-rated as a solution to energy efficiency. Poorly sealed windows can be a significant source of air leakage that is easily remedied without replacement.
Work performed in existing buildings generally does not trigger a blower door test unless the work area is thermally isolated from existing construction. The reasoning is that since existing construction is not subject to testing, and may not comply with the prescribed infiltration threshold, testing both areas would potentially invalidate the
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