Air Infiltration

Uncontrolled inward leakage of air (that may contain entrained water vapor) through cracks and insterstices in any building element and around windows and doors of a building, caused by the pressure effects of wind or the effect of differences in the indoor and outdoor air density (from Gatley, Understanding Psychrometrics).

Related terms: Air Leakage

Related resources: Review of Residential Ventilation Technologies, BA-1203: Measure Guideline–Wood Window Repair, Rehabilitation and Replacement, CP-9404: Measured and Predicted Energy Savings from an Industrialized House; Residential Ventilation and Latent Loads