8. Secure the humidifier housing to the opening at the top and bottom using sheet metal screws.
9. Use the 6 in. (155 mm) starter collar as a template to mark the opening for the bypass.
10. Carefully cut the opening for a 6 in. (155 mm) starter collar. See Fig. 5. Use a drill, punch or awl to start the cut
in the middle of the circle. Cut in an outward spiral to assist in controlling the cut.
Fig. 5. Cutting bypass opening.
11. Assemble the summer shutoff damper into the starter collar. Verify that the damper rotates freely between the
open and closed positions. Make sure the handle is accessible. Mark the damper Closed position as Summer
and the Open position as Winter. See Fig. 6.
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