Install several wooden blocks below the section of duct to.
Swamp cooler duct through roof detail.
Roof mounted are the most common although they are more difficult to maintain.
Diameter hole to be cut into the roof while not cutting through any roof joists.
Use an electric drill and drill bit to drill starter holes at the corners of the marked outline then use a saw to cut the outline.
The collar or apron can be used as an 18 inch template.
Use the cooler duct and a pencil or marking pen to mark the shape of the duct on the inside of the roof.
Keep the duct centered between the roof joists.
A typical down draft swamp cooler.
The advantage of a ground mounted version is you don t have to worry about your swamp cooler leaking through the roof.
A typical side draft cooler.
Mounted coolers are connected to ducts that bring the cooled air into the rooms of your home.
This swamp cooler installation will require a section of rigid ducting down through the roof with an end cap and a round sheet metal collar the same size as the flex duct.
2 buy a unit that can create 20 to 40 air changes per hour.
Fit the collar into the port on the side of the cooler with the section of duct extending horizontally above the duct riser at the roof.
You will also need a sheet metal can fabricated the same size as your ceiling diffuser opening and another round collar tied into the end cap.
Also this version is easier to perform maintenance on.
This may require access into the attic.
The included flex duct length is 7 feet.