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How-to-install-attic-fan-cover, to install an attic fan, first measure the attic and then use the chart below to select the proper size fan. note: this chart is based on a roof pitch of 4/12. if the roof is framed more steeply, you have more cubic feet of air to move, and you should consider increasing the attic fan size to the next larger fan in the chart.. Beware of low quality knock offs that have received poor reviews! the battic door 3' x 4' whole house attic fan ceiling shutter seal is an energy-saving insulating seal for whole house attic fans.