Exhaust Rain Cap Installation

Ensure that enough exhaust piping is installed to be able to install the rain cap and clamp.

Exhaust rain cap installation.

Both horizontal and vertical exhaust stacks should extend above or away from the building. Ensure that enough exhaust piping is installed to be able to install the rain cap and clamp. Vertical stacks require rain caps which impose little back pressure and can be forced open by exhaust. The flapper damper on this type of cap may corrode allowing the flapper damper to stick open or closed.

Ensure that the exhaust piping is not in contact with the inner wall of the thimble. Use hi temperature rated sealant mil a 46106b 100 series rtv to install a bead of sealant at the gap around the perimeter of the thimble body and the. Orient the rain cap such that the counter balance is facing against the. Ensure that the exhaust piping is not in contact with the inner wall of the thimble.

1949 farmall super a rain cap modification and installation and test jan kotze. Semi circular flaps butterfly damper cover the exhaust stack when fan is off. Place the rain cap over the exhaust pipe so that the top edge of the exhaust piping is a maximum of 25 from the top edge of the rain cap clamp. If the stub section on the cap is too large crimp it with a crimping tool.

Slide the new cap into the flue. Cause the exhaust gas to be blown down towards the home. If this happens you will not be able to recognize it. Ensure that the exhaust pipe does not interfere with the rain cap closure.

Use hi temperature rated sealant mil a 46106b 100 series rtv to install a bead of. A hinged flapper damper is opened by the exhaust flow from the stack and closes when the exhaust flow stops care must be taken to ensure continued proper operation. When fan is on flaps are forced out of the way to provide a clear path for air movement. Horizontal pipe outlets should be oriented away from prevailing winds and cut at 30 to 45 angles to reduce gas turbulence and resulting noise.

Level and secure the cap. Small conical stack caps often do not completely exclude rain because rain does not always fall straight down. Stack caps that deflect the exhaust jet have a detrimental effect on exhaust plume rise. Skip navigation sign in.

Available in most sizes. This video is about modify a too small rain cap to fit my farmall super a exhaust. Periods of heavy rainfall may be accompanied by high winds that deflect raindrops under the cap and into the stack changnon 1966. Made from galvanized spiral pipe for strength and durability.

The built in gutter system is designed to prevent rain and snow from entering the stack.