Special Features:

Designed for opening 4 ft w x 7 ft ht; 1600 fpm air velocity measured at points 3 ft above floor; air intake ports located on both ends and provided w/dampers for velocity control; departure from cited document: as modified by air intake location, intake dampers and elec characteristics

Properties:

A nonpositive displacement mechanical device having an axial or centrifugal fan impeller inclosed within a housing with an exhaust nozzle and baffles. It is designed to move air across an open entrance to provide an air barrier to minimize heat loss or gain and repel flying insects. It may include a means of heating the exhaustible air.