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CaptiveAire Systems - DR180HFA / High Speed Direct Drive Centrifugal Downblast Exhaust Fan with birdscreen, disconnect switch and 18-3/4" wheel CFM range: 1200 - 6700 - All Around Industry Supply
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300-600 CFM Direct Drive Upblast Food Truck Exhaust Fan - Typical for Hood Sizes: 3'-4'
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800 - 3000 CFM Premium Efficiency Direct Drive Upblast Exhaust Fan with Speed Controller (.75 HP / 115 V / Single Phase)
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Amazon.com: CAPTIVE-AIRE Direct Drive Centrifugal Downblast Roof Mounted Exhaust Fan with Speed Control- 19" Fan Base, 0.060 HP 115 Volt Single Phase Motor (DR-10HFA) : Tools & Home Improvement