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When a vent is less than 10 feet high, the vent should be at least as large as the flue collar outlet.b) Vents for draft hoods or flue collars 12 inches in diameter or less should NOT be reduced more than one pipe size.
Use duct tape to attach a 6-inch-diameter elbow to the vent cap. 11. From outside, slide the vent cap into the hole and secure it to the mounting plate with self-tapping screws. 12. From inside the kitchen, slide an elbow through hole and onto vent cap elbow. Secure with duct tape. 13. Screw the vent-hood mounting brackets to kitchen wall; be sure to drive the screws into wall studs. 14. Slide the vent hood into the brackets and secure with screws driven into wall studs. 15. Make the electrical connections to provide power to the vent hood's light and exhaust fan. 16. Install the vertical cover to conceal the exposed ductwork.