Schedule 40 fitting help.

hvac122

If you do this you will lose some effeciency and some furnaces require a outside intake.
If I read your lengths right you could possibly use 2" Read the venting charts and take off for elbows. Don't oversize if not needed.

MNice

[QUOTE=hvac122;740886]If you do this you will lose some effeciency and some furnaces require a outside intake.
If I read your lengths right you could possibly use 2" Read the venting charts and take off for elbows. Don't oversize if not needed.[/QUOTE

Is there another chart to go by? The only one I have is the one I posted from the manual it came with. Im not sure what is exceptable to call a short run. Do the elbows outside count? I need to elbow up to get my 12" above grade which it will be more than that with snow fall taken into account.

hvac122

There's usually a chart which tells you exact distances and how much to take off for elbows and such. I am on a mobile and these old eyes can't make out what you posted.

MNice

Going 2in. Whats your opinion? With that goofy vent drain (per the pic) i am not going up and to the right, I am goin up and to the left. would it be better to put that "T" (drain) as close as possible to the 90* which would be directly above the furnace "or" should i place it so that it is to the left of the furnace? This would put it about 20" to the left of the 90*.