This Alpine AH4000-7121 15" to 26" Telescopic and Adjustable Roof Jack has some small denting around the edges of the unit incurred during shipping. For detailed photos please click 'See Additional Images' above. This Alpine AH4000-7121 15" to 26" Telescopic and Adjustable Roof Jack meets the full manufacturer's specifications, comes with the full manufacturer's warranty, and includes Alpine's premium guarantee.
This roof jack is the only piece needed to vent your Alpine mobile home furnace. For proper fit, measure from the base of the furnace to the flange on the top of the roof. Note: Hydroment Sealant is the only substance approved for installation of roof jacks.