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If filters are used on gravity intake, size intake ventilator to keep intake losses below 1/8” SP. • Avoid fans blowing opposite each other, When necessary, separate by at least 6 fan diameters. • Use Class B insulated motors where ambient temperatures are expected to be high for air-over motor conditions. • If air moving over motors contains hazardous chemicals or particles, use explosion-proof motors mounted in or out of the airstream, depending on job requirements. * Process Ventilation • Collect fumes and heat as near the source of generation as possible.

Since these are relatively new products, several different test standards have emerged to evaluate the performance of these products under severe wind and rain weather conditions. In addition, manufacturers have developed their own standards to help evaluate the rain resistance of their products. Specifying engineers should become familiar with the differences in various rain and pressure drop test standards to correctly evaluate each manufacturer’s claims. /h) Wet Wall Water Flow Rate L/s (gpm) Airflow Through Louver m/s (fpm) Dade Co.

28 System Design Guidelines General Ventilation • Locate intake and exhaust fans to make use of prevailing winds. • Locate fans and intake ventilators for maximum sweeping effect over the working area. • If filters are used on gravity intake, size intake ventilator to keep intake losses below 1/8” SP. • Avoid fans blowing opposite each other, When necessary, separate by at least 6 fan diameters. • Use Class B insulated motors where ambient temperatures are expected to be high for air-over motor conditions.

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