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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a Modine hot dawg propane heater garage...it has a 3"

Customer Question

I have a Modine hot dawg propane heater for my garage...it has a 3" vent discharge port. I am running a vertical vent no more than 15 feet...can it all be 3" galvanized B-vent?
Submitted: 11 months ago.
Category: HVAC
Expert:  airheatman replied 11 months ago.

Absolutley can be double wall B vent. What size is heater? BTUS will determine requires diameter

I see now it is 45,000, Let me look this up right quick

Customer: replied 11 months ago.
45,000
Expert:  airheatman replied 11 months ago.

The 3" TYpe B double wall is fine.

Note from manual the 3" is large enough for up to 75,000 BTU.

"A3. All heaters come with a factory installed vent adapter for attaching the vent pipe to the heater (3” for model sizes 30-75, 4” for model sizes 100-125). Attach the vent pipe to the adapter with 3 non-corrosive screws. (Drill pilot holes through the vent pipe and adapter prior to screwing in place)."