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8'' automatic wall fan has a permanently lubricated motor, steel housing, polymeric fan blade. Built-in damper minimizes back-drafts. Built-in rotary On/Off switch. 11-1/4'' square white polymeric grille can be painted to match surrounding walls. 8-3/8'' adjusts to fit walls 4-1/2'' to 9-1/2'' thick diameter sleeve, 14-1/4'' square outside flange 180 CFM. UL listed.
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