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Locate the blower on the rear slope of the roof. Place it in a location to minimize duct run. The location should be free of obstacles (T.V. leads, electrical lines, etc.). If the blower top is level with the roof peak, it will not be seen from the street. Keep this approximate location in mind as you work from within the attic. 2. Mark and drill a guide hole centered between roof rafters. 11" dia. hole20." 11" dia. hole 1" OO 911/16" 20." OO 18" 125/8" 18" 1211/16" 1." dia. hole1." dia. hole Ro