hvac - Water Heater Gas B-Vent Install - Home Improvement Stack Exchange
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Gas Water Heater Vent Codes & Standards 15 water heater venting checkpoints
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2021 International Residential Code (IRC) - APPENDIX AB SIZING OF VENTING SYSTEMS SERVING APPLIANCES EQUIPPED WITH DRAFT HOODS, CATEGORY I APPLIANCES AND APPLIANCES LISTED FOR USE WITH TYPE B VENTS - AB102.2
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