An auxiliary fan which increases the air pressure in a system; used to provide additional capability to handle peak exhaust (or supply) loads in an air-conditioned space such as a theater lobby; also used to supply air to furnaces.
An auxiliary fan which increases the air pressure in a system; used to provide additional capability to handle peak exhaust (or supply) loads in an air-conditioned space such as a theater lobby; also used to supply air to furnaces.