78318 - Multi-Pitch Roof Jack with Slide DamperDial 78318 Multi Pitch Roof Jack with Slide Damper Multi Pitch adjustable roof jacks are ideal for the installation of all major brands of residential ducted down draft coolers. Rails are pre installed to support an optional Max Aire barometric damper. Roof jacks are flanged and adjustable for flat roofs and for roofs pitched up to 6 12. 3000 to 4500 CFM jacks have 17 3 4" discharge opening. 5500 7000 CFM jacks have a 19 3 4" discharge opening.
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