3799703 is referenced by 21 patents and cites 9 patents.

An enclosed ventilating unit for circulating air through a portable sound control room, including a casing adapted to be mounted on the wall of the sound control room, a fan unit in the casing, means resiliently mounting the fan unit in the casing to absorb vibration, and sound insulating means lining the interior of the casing to absorb sound, whereby the sound and the vibration of the fan unit and the sound of air flow are substantially minimized in the ventilating unit without transmission into the sound control room or to the surrounding space.

Ventilating unit for sound control room
Application Number
Publication Number
Application Date
May 24, 1972
Publication Date
March 26, 1974
Douglas Daryl D
Urch Harvey M
Paine David L
Hofgren Wegner Allen Stellman & McCord
Wenger Corporation
F24f 13/18
F24F 13/24
F24F 13/00
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