4-speed, 115V/60Hz blower, maximum 1,654 CFM at 1" static pressure. Draws 9 amps. A useful fan for delivering air into air circulation systems for growing rooms, spawn laboratories and incubation chambers. Also ideal for blowing air into 2 x 4 foot HEPA filters (use highest speed). Note: not for free air delivery. Must be used with at least .8" static pressure (all of Fungi Perfecti's HEPA filters are 1" static pressure).