Blower Door Test

Related terms

• Air Leakage (AL)

  The rate of air infiltration through a window assembly; lower is tighter and more efficient.

• Boiler

  A heating appliance that heats water for radiators, baseboard, or radiant floors (hydronic heat) rather than blowing warm air.

• Backwater Valve

  A check valve in the building drain preventing municipal sewer backups from flooding the home. A recommended add in basement remodels.

• Bonding (Pools/Gas/Water)

  Tying metallic systems together so they can't carry a dangerous voltage difference. Specific bonding is required for gas piping, water li…

• Backflow Preventer

  A device stopping contaminated water from being siphoned back into the potable supply. Code-required at hose bibs, irrigation, and boilers.

• Box Fill

  The NEC limit on how many conductors/devices fit in an electrical box. Overfilled boxes overheat and are a common inspection failure.

• Backdrafting

  Combustion gases (including CO) being pulled back into the house instead of up the flue, often from negative pressure caused by exhaust f…

• Branch Circuit

  Wiring from a breaker to the outlets/devices it serves. Circuit count and dedicated circuits are core to any kitchen, bath, or addition.