How To Connect Ducting To A Roof Jack
Insert telescoping roof jack assembly through the opening cut on the roof.
How to connect ducting to a roof jack. Insert two additional screws along the seam with equal spacing between the three screws. Typically the duct passes through the roof jack with a rubber flange at the top of the cone of the roof jack making a water tight seal against the side of the duct. The three screws will prevent the two ducts from moving and separating at the new seam. Direct the crane operator to position the unit on the platform with the outlet port at the side facing the direction of the duct riser at the roof.
Typically the duct passes through the roof jack with a rubber flange at the top of the cone of the roof jack making a water tight seal against the side of the duct. So for your 10 diameter duct your custom roof jack should have a 10 opening at the top of the cone. So i don t know what size to make it and i think it depends on how the duct is attached to the roof jack. The roof jacks i ve seen are tapered wider at the bottom than the top.
2 fit the tapered end of the duct collar firmly. I can t find a roof jack off the shelf anywhere that will fit that large a duct so we might end up getting one made. Insert a 1 2 inch long self tapping sheet metal screw at the location where the two ducts overlap to provide a solid connection. 2 connect roof jack assembly to the furnace.
So for your 10 diameter duct your. Then just connect the feed duct to it and put a few short screws through it and wrap it with aluminum tape. Installing the roof jack 1. Then screw the ply to the roof deck.