Length of flue pipe

[kurt]

What's the maximum length for direct vent (PVC) flue pipe?

Had one today w/6 heating system's; one of them had flues approx. 33' long going out the wall.

[Terence McCann]

This may help Kurt.

http://www.alpinehomeair.com/related/Go ... ctions.pdf

[Bill Kibbel]

"What's the maximum length for direct vent (PVC) flue pipe?"

I think that is determined by the manufacturer. I saw one that was 45' that was listed as acceptable.

Do you have the pipe diameter, # of elbows, furnace manufacturer and model # ?id="blue">

[kurt]

Originally posted by inspecthistoric

"What's the maximum length for direct vent (PVC) flue pipe?"

I think that is determined by the manufacturer. I saw one that was 45' that was listed as acceptable.

Do you have the pipe diameter, # of elbows, furnace manufacturer and model # ?id="blue">

I've been to the Lennox site, & couldn't find anything that applied. I know that it varies, and different mfg's. have differing requirements.

I just thought maybe someone would have the magic link for a "standard" industry limitation.....

[kurt]

Originally posted by Terence McCann

This may help Kurt.

http://www.alpinehomeair.com/related/Go ... ctions.pdf

Thanks; that's sorta what I was looking for. A general length listing, so to speak...

[Neal Lewis]

The vent pipe sizing table for the Lennox G26 Cat IV furnace says for a 3" exhaust the maximum lenght is 130 feet, straight run with no elbows. 90 degree elbow is equivalent to 5 feet; 45 is 2 1/2 feet.

[kurt]

Thanks Neal; that's (again) sort of what I was looking for. Just trying to get a general idea of the parameters.

Ya know, this little place is starting to be a pretty good reference source; way to go, Mr. O'....

[MechAcc]

Originally posted by Neal Lewis

The vent pipe sizing table for the Lennox G26 Cat IV furnace says for a 3" exhaust the maximum lenght is 130 feet, straight run with no elbows. 90 degree elbow is equivalent to 5 feet; 45 is 2 1/2 feet.

On 90 degree there are short sweep and long sweep elbows. The long sweep is equivalent to 5 feet. The short sweep is 10 foot equivalent.