Z-Flex Venting Accessories - Water Heater Accessories - 2SVSFSSF03 3" Fire Stop Support Z Flex Z Vent SS Venting - For AquaStar 2700ES, 2400ES, 2400E Models3" fire stop support Z-Flex Z-Vent stainless steel venting (2SVSFSSF03) for the Bosch AquaStar 2700ES / Bosch AquaStar 2400ES / Bosch AquaStar 2400E / Bosch AquaStar 250SX / Bosch 635ES tankless water heater for use when venting through a floor. The fire stop support is required when running Z-Vent stainless steel venting vertically through a floor. The Bosch AquaStar 2700ES / Bosch AquaStar 2400ES / Bosch AquaStar 2400E requires 3" stainless steel venting for Category III Gas Appliances. Our Z-Flex Z-Vent venting meets these requirements and is rated AL29-4C. Z-Flex Z-Vent is approved for Category I (vertical only), II, III & IV applications and is designed for use with boilers, high efficiency gas and oil heaters and water heaters where cool flue gases are vented under pressure. Z-Vent contains a built-in, fail-safe gasket and locking band connection. No sealant is required.
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