Multi-pitch adjustable roof jacks are ideal for the installation of all major brands of residential ducted down draft coolers. Roof jacks are flanged and adjustable. The 3000 to 4500 CFM jacks have 17 and 3/4 in. discharge opening.
- Used for 3000 to 4500 CFM coolers
- Includes a slide-in winterizing damper
- Adjusts from flat up to 6/12 pitch
- Galvanized steel