Models G (direct drive) and GB (belt drive) are spun aluminum fans designed for roof mounting on curbs for general exhaust applications with relatively clean air. Wheels are backward inclined (non-overloading) and are available in standard and high pressure designs. Motor and drive frame are mounted to the fan on double studded isolators for true vibration isolation. Capacities up to 42,000 cfm or up to 3 in. wg.