Featuring weatherized, direct drive, non-explosion-proof design, Intelli-Sense Multi-Speed Blowers are controlled by 2- or 3-position switch. Units can exhaust fume hoods from 3–7 ft in width at full sash open height and 100 fpm face velocity. Phenolic coated steel models are recommended for low to moderately corrosive applications, while fiberglass units suit highly corrosive environments. For extremely corrosive atmospheres produced by high order oxidizers, PVC models are available.