Air Barrier Effectiveness Calculator

Calculate infiltration heat loss and determine effective leakage area from air barrier performance.

Conditioned space volume
ft³
Blower door test result, tight: <1.5, average: 3-7, leaky: >10
ACH50
Winter heating setpoint
°F
Winter design temperature
°F
Local average wind speed
mph
Floor to ceiling height
feet

Results

Natural Air Changes per Hour-ACH
Infiltration Airflow-CFM
Infiltration Heat Loss-Btu/h
References: ASHRAE Fundamentals Ch. 16 - Ventilation and Infiltration, ASTM E779 - Air Leakage Testing