Tuesday, 24 February 2026

Hi, I need help understanding the code for proper flue sizing for a furnace and hot water heater running to a common flue.

It sounds like you’ll likely need properly sized Category 1 (B-vent or C-vent) metal flue pipe, sized to handle both the 100,000 BTU fan-assisted furnace and the 40,000 BTU water heater with minimal bends, and installed per NFPA 211 clearances, but confirming exact diameters and configuration with an HVAC professional or local code inspector is essential before final purchase.

source https://www.inspectorsjournal.com/topic/19822-hi-i-need-help-understanding-the-code-for-proper-flue-sizing-for-a-furnace-and-hot-water-heater-running-to-a-common-flue/?do=findComment&comment=183254

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