ABS acceptable for combustion vent

[Greg Keene, CPI]

Found 2 CAT heaters in a house. These are vented catalytic gas heaters. Do they vent cool enough to use ABS for the vent line? Found them on the internet but could not find an installation book.

[Troy N. Pappas]

http://ventedcatheater.com/6.html

"Regular Schedule 40 ABS or PVC drainpipe can be used for up to 20' of additional exhaust pipe with up to four 90 degree turns. The exhaust pipe can be routed out of the back of the heater, down from the heater, to either side, or straight up. Care should be taken in routing and connecting the gas line, which should be performed by a qualified person."

Could be manufacturer specific and would recommend checking manufacturers installation instructions.

[Michael Larson]

Originally Posted by gkeene

Found 2 CAT heaters in a house. These are vented catalytic gas heaters. Do they vent cool enough to use ABS for the vent line? Found them on the internet but could not find an installation book.

Attachment 59100

It depends on the particular furnaces exhaust gas temp.

Consult the mfgs. documents.

[Greg Keene, CPI]

Thanks - could not find the manufacturer instruction on the internet.

[Michael Larson]

Originally Posted by gkeene

Thanks - could not find the manufacturer instruction on the internet.

Make and model please.

[Greg Keene, CPI]

Originally Posted by mlarson

Make and model please.

The only thing isted was the name - the data plate only listed the specs for electric and gas. Could not find anything else - it was installed in about 1971.

[Michael Larson]

You might try contacting them here.

http://ventedcatheater.com/6.html

[ROBERT YOUNG]

Originally Posted by tpappas

http://ventedcatheater.com/6.html

"Regular Schedule 40 ABS or PVC drainpipe can be used for up to 20' of additional exhaust pipe with up to four 90 degree turns. The exhaust pipe can be routed out of the back of the heater, down from the heater, to either side, or straight up. Care should be taken in routing and connecting the gas line, which should be performed by a qualified person."

Could be manufacturer specific and would recommend checking manufacturers installation instructions.

Thanks Tony. I have a starting reference.

The ID or Model plate with serial number are underneath at times.
Real buggers.

Any small pullout doorway for the pilot and temp control?

A little Mirror underneath works at finding those hidden plates with all the information.

My bore scope need 3" inches of clearance. A cell phone 1" and time the shot.

All the best.

[Cameron Anderson]

How funny, I was just about to post nearly the exact same question.

Did a manufactured home last night with a 90% and the intake and flue were both ABS. First time in 8 years I have ever seen that. I assumed on an 90% the temp would be okay but I thought I should check with the HVAC guys on here.


Also, does anyone have a good illustration of a 90% intake and flue properly exiting through the roof?

[Michael Larson]