I am installing a smaller 8k btu direct-vent heater in my ice house. It did not come with instructions and looks real easy to install, but I need to make the pipes that go out side shorter to fit a 1.5″ wall vs the 3.5″ wall of the house it came out of.
My question is, will taking and additional 2″ of piping off make a difference for proper airflow?
Thanks for any help.
Not excatly sure where your cutting, but would it be possible to make a spacer instead?
Al
Hey Al, thanks for the quick response.
I am cutting both of the galvanized intake and exhaust tubes that go through the wall. I just want to shorten them to the thickness of my thinner wall.
also, thought about the spacer, but I would like to reduce the amount it stick out outside or how much it would have to take up on the inside.
I’d be concerned with the units ability to draft if shorter, hard to say.
A call to the manufacter will probably have them saying not to touch it, because of liability
Never know though.
Al
stcroix:
First pic is stove by itself with adapter pipe sticking out??? Second pic shows outside termination??? Did the unit come with a wall thimble??? Do any instructions come with??? Does the termination tighten to the interior pipe???
Mark
Yes, that was concern also. I tried to call HomComfort and they have a message that states “There is a winter storm going through their city” and they will be “closed until further notice”.
1st pic is the units after I took off the outside termination. Not sure what a wall thimble is, that can’t be good 
No instructions.
The inner galv pipe is the exhaust, the outside pipe is the fresh air intake, I think.
And it has a threaded long screw that pulls the outside termination tight.
Not sure what else is involved but in general a shorter pipe should only increase your airflow, however slightly. The more length you have the more your flow is restricted. The more turns, the more your flow is restricted.
Quote:
Not sure what else is involved but in general a shorter pipe should only increase your airflow, however slightly. The more length you have the more your flow is restricted. The more turns, the more your flow is restricted.
On a forced draft maybe, but to short a vent on a natural draft unit may not vent well.
Al
Didn’t take the time to look too far, but here’s the manual I think?
From the manual “installed on walls 4.0-11.75 inches thick” if this is your unit. 
Most definitely, inner is exhaust and outer is the intake. Wall thimble (WT) is metallic piece that pipe runs through. Is there any possibility that you might be able to get WT, then install and block out to the horizontal termination???
Mark
Good find Czech!!! All the info is regarding the DV-8. It shows installation procedure and parts. You may have everything you need in the pdf file.
Mark
just printed, thanks for all the replies and PM’s.
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