AIR LEAKAGE INTO AND OUT OF BUILDINGS THROUGH WALL CRACKS AS WELL AS WINDOWS AND DOORS.

Air that leaks into a building through cracks or gaps.

the introduction, usually unintentional, of unconditioned outdoor air into a mechanically heated and/or cooled building. Air infiltration can occur through any opening in the home's structure, including seams where walls meet other walls, window or door frames, or chimneys; holes where wires or pipes penetrate walls, floors or ceilings/roofs; and between the loose-fitting meeting rails of double-hung windows or a door door bottom and door threshold. It is one of the major cause of unwanted heat gain and loss and personal discomfort in buildings.

The amount of air that passes through a window vent and perimeter frame, or a door panel and perimeter frame. Standards are set by AAMA for the amount of air infiltration allowed in a window or door.

The amount of air leaking in and out of a building through cracks in walls, windows and doors.

Leakage of air into rooms through cracks, windows doors and other openings.

Amount of air infiltrating and escaping through cracks in walls, windows and doors.

Air infiltration refers to how much air can get through the window frame. It's expressed as how many cubic feet of air pass through a square foot of the frame, per minute.

Air that passes through or between a window or door sash and frame.

The ratio of air leaking through cracks in building.

The amount of air that passes between a window sash and frame. In windows it is measured in terms of cubic feet or air per minute, per square foot of area. The lower the number, the less air the window lets pass through.

The air that leaks in around doors, windows, and electrical outlets, etc. which can be a major source of heat loss.

Air passing through a door system when the door is under pressure, usually from wind.