Lambro 109R Roof Cap, Aluminum

A damper and screen in the aluminum wall exhaust hood vent with 1-3/4 in pipe prevents outside elements and air from entering the vent when not in use. The damper opens and allows the exhaust air to exit the vent through the sufficient opening containing the screen, which has a net-free area of 10.5 sq-in. When the screen is removed, the net-free area increases to 20 sq-in, allowing for maximum air flow. The Lambro aluminum exhaust hood vent with 1-3/4 in pipe is ideal for venting through the roof. The damper seals the vent opening when the bath fan, range hood and microwave are not running because no exhaust air exits the vent. When the appliance operates, the exhaust air pressure pushes the damper open to let the exhaust air escape from the vent. The vent is for new and replacement installations over an existing 4 in opening. The vent features an opening containing the screen with a net-free area of 10.5 sq-in, allowing for less back pressure. The net-free area of the unrestricted opening is 20 sq-in when removing the screen. The vent's manufacturing material is 22 ga aluminum for durability and will not rust to maintain longevity. Make sure to check local building codes before installation.