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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8267
Experience:  Furnace, A/C and heat pump specialist.
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What is the max length the vent can be on my furnace model

Customer Question

what is the max length the vent can be on my furnace model number G9MXE1002120A1
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Let me ask a couple of questions? What size vent are you using and is it straight up or how many elbows will be in vent?

Expert:  airheatman replied 1 year ago.

You can determine total allowable length including any elbows by the charts on pages 51 to 54 in this manual.,%20G9MXT,%20G9MXE%2096%20AFUE%20Installation%20Instructions.pdf

Customer: replied 1 year ago.
2 in now looking to go to 2.5 or 3 im having moister prob after my vent was replaced 3 45s 2 90s 13' of pipe
Customer: replied 1 year ago.
28' of pipe first number was wrong
Expert:  airheatman replied 1 year ago.

Sorry, got called away from my desk. Can you tell me what the altitude is where you live ? Or I may can determine if you tell me where. Then I will calculate for you.

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