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Gmh95/gch9 manual calls for 3 inch exhaust pipe?

Gmh95/gch9 manual calls for 3 inch exhaust pipe? 3 inch seems large for a 90k btu..I was going to run 2 inch book says 3...the run is about 18 feet..Thanks!

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Furnaces must be vented EXACTLY as specified by the mfr or you WILL have problems - they spend a lot of time and money coming up with those specs. then design the furnace based on them.

Posted on Oct 07, 2009


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Can I get more horse power? 1998 Chevy Silverado w/V8 350?

Reducing the pipe diameter will improve scavenging and increase fuel economy at the expense of power large free flowing exhaust is important for max power. If you want more power the simple answer is use the bolt-on supercharger kit available as an after market option.

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I have a Goodman GMH95/GCH9 furnace. The blower runs but no flame. LED is on (normal operation) checked fuse ok. held down fault button-6 flashes. didnt look like the draft blower turned on when a call for...

Hello, you can check the resistance of the motor by turning power off to the furnace and disconneting tje two wires which go to the motor. Take a meter and check the resistance, you should have resistance, if not the motor is bad. A rollout switch is a normally closed switch so you will chevk its resistance aswell, if the switch is open that signals a problem with the burner flames and you not read resistance. If the switch is closed and good you will read resistance.

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Size of the exhaust vent pipe on a 75 gallon gas water heater? Is it the same size as on a 50 gallon water heater. Brand is GE, mfg 2008

I believe it takes 4" vent pipe up to 100,000 BTU
BTUs are shown on label side of tank.

Does new water heater have power vent? What does manual say?
Are you experiencing vent problem now? When you light a match and put it under vent stack, does smoke immediately get pulled upward? Are furnace and waster heater connected to same venting. Is there dark exhaust stain around vent hood? Does exhaust vent back out of vent hood when furnace kicks on? Are flue pipes stained with rust and white coating? Are vent pipes vertical, or are there level runs? Are the pipes made of galvanized and screwed together with 3 screws at each joint?

Frankly I would double-triple-check any internet answer dealing with possible CO poisoning at your home.
1) Ask local plumber for specific code in your area.
2) Call gas company
3) Post question on pro water heater forum:
4) Read whole manual for new water heater before buying.
5) Contact manufacturer.

Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 30, 2011 | Water Heaters

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Hi, my 200sx has been fitted with an exhaust (not by me) which has a stainless steel 3inch pipe running from the cat-back, but goes in to a backbox which has what looks like a 1, maybe 1 1/2 inch pipe in...

Hi,,,,yes that is a huge restriction and realy insane,,,,,get rid of that pea shooter and put 3 inch,,im suprised it hasnt done any enginge damage.

good luck

Mar 24, 2011 | Exhaust for Nissan 200SX

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New gmh95/gch9 system. getting a diag. code 3 flashes, [pressure switch area]. all flues clear, hoses clear,drain lines working. left side down application and i just installed kit #000143- flue drain ....

I like the unit.How new?Check the pitch/tilt of flues they cant sag or haue dip/low spots.How many 90degree elbows on exaust pipe?Approxmately how/long many feet is pipe?

Mar 27, 2010 | Goodman Heating & Cooling

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Furnace will not shut off after the setting is reached. have changed thermostat. Temperature reading goes down on thermostat, furnace still runs. Model : Goodman furnace,gmh95/gch9

Check if your thermostat is set on 'o fan' setting.
If it is, trey to set it on 'Auto-fan' instead.
since it seem as if the heating does go off,only the fan may be running continuously.
this is possible if the thermostat is incorrectly set or installed.
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Generally speaking, too small a gas line will not inhibit the heater from lighting; it just won't burn efficiently and you will likely shorten overall heater life due to burner corrosion and soot buildup on the heat exchanger. Unless the total run of pipe to the heater is under 20' the pipe should have been 1-1/4" or larger, depending on what type of pipe was used.

That said, you should probably contact Pentair to arrange for a warranty service call to examine why the heater is not lighting. If the tech sites installation issues, be sure to get it in writing so you can go back to the plumbers for corrective action.

Contact Pentair. Select service providers and heaters and you should find someone local...

In case you do not have it, here is your owner's manual.

Oct 11, 2009 | Pentair MASTER TEMP HEATER 400 000 BTU NG...

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I have a Goodman GMH95/GCH9 furnace, the integrated control module LED is flashing eight(8) time and the troubleshooting chart only goes to seven(7)

open the front door to the furnace to access the controls there should be a red button try pushing it to reset

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