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A hot second-floor bedroom, blistering roof deck, and attic insulation that feels like it is radiating heat are common signs of an attic ventilation problem. Searches for “what size attic fan needed” usually lead to a simple CFM number, but fan selection is not that simple. The right attic fan must match the attic floor area, available intake ventilation, roof configuration, climate, and whether the home already uses a whole house fan. An oversized power attic ventilator without enou …