Air leakage can increase heating and cooling costs over 30% and contribute to comfort, health and safety problems. Finding hidden air leakage sites, called bypasses, can be difficult without the use of a blower door. This diagnostic equipment uses a fan to pressurize (force air into) or de-pressurize (force air out of) a building. When the fan operates, it is easy to feel the effects of infiltration - air leaking through cracks in the building envelope. Blower doors have gauges which can measure the relative leakiness of a building.
A duct blaster combines a small fan and a pressure gauge to pressurize a house's duct system and accurately measure air leakage of the ductwork. This test is similiar to a pressure test of a plumbing system. Duct leakage can increase heating and cooling costs over 30% and contribute to comfort, health and safety problems.
The blower door measures air leakage into your home.
Duct testing measures leakage in your HVAC system.