Z-Flex Vent 3" or 4" Termination Hood with Backflow Preventer Damper
Vent Termination Hood with backflow preventer (damper). Single not double wall pipe, but will work properly with double wall pipe. Essential for tankless water heater venting, as it prevents freezing air from entering into the venting system and freezing the heater's pipes, damaging the heater and voiding the warranty.
Z-Vent does not manufacture a 5" vent termination hood with damper...only 3" and 4".
Flange dimensions for the 4" diameter hood: 7.25" x 7.25".
• Simple gasketed connection requires no sealant
Compatibility and cross reference:
The 4" diameter version of this item is compatible with the following tankless water heaters, as shown in their manual:
American Water Heaters GT-510-P/N Indoor Liquid Propane/Natural Gas
* Since these heaters are natural rise systems, they can only utilize a backflow preventer (damper) if they also include a low CFM booster fan and a thermostat to regulate when the fan should turn on.