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![Larson Electronics - 18" Explosion Proof Exhaust Fan - 3990 CFM - 1/2HP, 480V AC 3PH - Roof Mount](https://www.larsonelectronics.com/images/product/addpic2large/265173.JPG "Larson Electronics - 18" Explosion Proof Exhaust Fan - 3990 CFM - 1/2HP, 480V AC 3PH - Roof Mount")
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