This report represents a methed of estimating the infiltration rates through high-use automatic doors. This infiltration is specified as a function of the rate of use of the door, the door geometry, and the pressure difference across the door.

Two studies were carried out to obtain the results included here. One was a laboratory study of the discharge coefficients of doors of various geometries. The other was a field study of the times for which automatic doors are open, as a function of use.