| [GMCnet] Extra long screw for furnace exhaust [message #331571] |
Mon, 30 April 2018 21:53  |
Richard Denney
Messages: 920
Registered: April 2010
Karma:
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Senior Member |
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The stock center screw that connects the vent with the exhaust tube on the
Suburban furnace is 3-1/4” by #8. It’s designed for wall thicknesses up to
2-1/4”—about 1/4” less than the side of the coach. The new furnace requires
about that much more screw length because the threaded hole is deeper in
the tube by a bit.
I have completely struck out on finding a #8 sheet metal screw that is
longer than the special 3-1/4” screw Suburban provides. Nothing at McMaster
or any of the other usual suspects. Suburban sells exhaust vent assemblies
for thicker walls (not that anyone keeps them in stock), but the screws
don’t come with them and they don’t seem to be available separately. My
exhaust and intake tubes fully engage the furnace, so I don’t need that
item, but a screw a half-inch longer would be nice.
The furnace isn’t going anywhere and I can live without the screw, I
suppose, but I would prefer to have one in there.
Any ideas?
Rick “who wouldn’t have thought a #8x4” sheet metal screw would be that
hard to find” Denney
--
Rick Denney
73 x-Glacier 230 "Jaws"
Off-list email to rick at rickdenney dot com
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