Viking VCWH 1200 CFM Exterior-Power Ventilator Kit - Installation Instructions - Page 2

P R E PA R E THE INSTALLATION LOCATION ROOF INSTALLATIONS 1. Locate the ventilator 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 ventilator 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. PREPARE THE INSTAL L AT I O N LOCATION WALL INSTALLATIONS 1. Choose a position on the outside wall. Make sure that no wall studs, pipes or wires run through the opening area. 2. From inside, mark and drill a guide hole centered between wall studs. 3. From the outside, use the guide hole as a starting point to lay out the installation: A. Use a T-square to measure 913/16" to the left of the guide hole, then up 1211/16" to locate the top-left corner of the layout. B. Starting from the top-left corner, mark the rectangular cutout (18" W x 20½" H) and remove only the shingles in this area. C. Mark an 11" diameter hole centered on the guide hole. Cut this hole through the roof board(s). D. Mark and cut a 1¼" diameter hole through the roof board(s) where shown. 2" 2" 22" 6¾" 29½" 3. From the outside, use the guide hole as a starting point to lay out the installation: A. Use a T-square to measure 1113/16" to the left of the guide hole, then up 1411/16" to locate the top-left corner of the layout. B. Starting from the top-left corner, mark the rectangular cutout (22" W x 29½" H) and remove only the siding in this area. C. Mark an 11" diameter hole centered on the guide hole. Cut this hole through the roof board(s). D. Mark and cut a 1¼" diameter hole through the roof board(s) where shown. 4. For flat roof installations, build a curb that will mount the ventilator at a minimum pitch of 2/12. Discharge end of the ventilator should be pointed away from prevailing winds. 2