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Old 11-06-2014, 05:38 AM   #15
Rivet Master
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1964 22' Safari
1968 26' Overlander
Beaver County , Pennsylvania
Join Date: May 2008
Posts: 599

I was thinking machining it out of a solid chunk of aluminum. Your sketch is great, but I'm not sure how thick the lower edge would need to be for the exhaust plate to be flush. I took a quick look on for aluminum bar stock. They have inch thick X 6 inch wide bar of 2024 T3 (same as sheet on pre 1969 trailers) for about $35 per foot. That could end up being a pretty expensive wedge, but the machining would be pretty straightforward.


I'm leaning toward the NT30 also. Seems like plenty of heat output for a 26 ft. I plan to put the plenum above the floor and under the new support I build. I'll use the single cold air return as a hot air duct and add the other vents from the plenum. I like your idea of leaving a inch gap, although, I may add inch insulation board. I need to raise the new furnace 6 inches, so with inch top and bottom and inch for the support, I'll still have enough duct height to easily handle a 4 inch duct. Thanks for you insights and experience.


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Old 11-06-2014, 07:22 AM   #16
Rivet Master
1981 31' Excella II
New Market , Alabama
Join Date: Sep 2011
Posts: 5,706
I could probably make some of these things if we had some folks interested.


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