Generator Exhaust Pipe Through Trailer Roof

Roof jacks are critical in complying with local fire and safety regulations by protecting wall and roof material from exhaust pipe heat.

Generator exhaust pipe through trailer roof.

In poor weather the plan was to run the generator in the garage and pipe the exhaust through the port in the door. A double wall pipe or at least a larger piece of sheet metal similar to a bulkhead fitting will suffice. I welded 1 3 4 exhaust pipe onto the muffler end it was a good bit larger so had to fill in. 2 each 3 inch drain pipe 4 foot length longer if your motorhome is tall.

It got rid of the exhaust fine but 3 unexpected problems came about. Double walled metal thimbles must be 153mm 6 inches larger than pipe diameter. Roof jacks are designed for non combustible metal enclosures only. I had 10 of 1 5 iron pipe which gave me about 8 sticking past the door on the outside.

1 inch stainless steel exhaust pipe parking air heater fuel tank diesel gas vent hose. It utilizes a tubing and coupling system to raise the generator exhaust above the top level of your rv. You want at least 1 foot above the roof line. They provide transitions for exhaust piping where it is necessary to pass exhaust pipe through walls and roofs safely to the outside atmosphere.

Trying to vent engine drive exhaust from enclosed trailer. Then took a 90 degree exhaust and turned it down to adapt it to 3 double wall gas vent pipe. This was a little onan 5cck. This was to go through the plywood floor.

The exhaust flue must be placed inside the walls extending up to the top of the building. Pipes passing through wooden walls or roofs require single walled metal thimble guards 305mm 12 inches larger than the exhaust pipe diameter. 1 each 3 inch drain pipe 1 foot length with cutout 2 each 3 inch drain pipe couplers. Hapco insulated exhaust roof and wall thimbles are recommended for use with exhaust pipes that must pass through a structure.

The venting system is designed specifically for rv generators to help provide fresher air around rvs plus minimize generator noise. Venting welder generator exhaust from enclosed trailer you will want to isolate the pipe as it passes through the trailer. The thimbles prevent exhaust pipe heat from being transmitted to the combustible material. One was the amount of heat produced.

Because of a long equivalent length of the exhaust flue about 40 50 ft and bends the calculated pressure loss exceeds that suggested for the generator. The thimble must conform to the national fire protection association bulletin nfpa 110 and local building codes.