I need to relocate the vent termination for my BradfordWhite gas HW heater. Model M1TW50S6FBN, 50gal. 40,000 BTU input.
The current location is now posing a trip hazard for my deck stairs in addition to being below the snow clearance height. There are several concerns that I need to consider with the new placement.
NFGC - Code states:
12.9.2 A mechanical draft venting system of other than direct-vent type shall terminate at least 4 feet below, 4 feet horizontally from, or 1 foot above any door, operable window, or gravity air inlet into any building.
12.9.3 The vent terminal of a direct-vent appliance with an input of 10,000 Btu/hr or less shall be located at least 6 inches from any air opening into a building, and such an appliance with an input over 10,000 Btu/hr but not over 50,000 Btu/hr shall be installed with a 9 inch vent termination clearance, and an appliance with an input over 50,000 Btu/hr shall be at least a 12 inches vent termination clearance.
explanation of the code: Subsection 12.9.3 permits the vent terminals of direct vent appliances to be located much closer to air inlets than is provided for with mechanical draft equipment. There is often a mis application of rules for mechanical draft to direct vent equipment. The vent gases from direct vent equipment disperse rapidly upon leaving the vent terminal, even when the terminal is located under an open window.
installation instructions/code also state that the exhaust needs to be 4' to the side of a combustion air inlet to any other appliance. also, 24" vertically to an unventilated sofit
What I cannot determine what my unit is classified as. It's listed as a "power vented gas water heater" but is it a "mechanical draft venting system' or a "direct vent".
I also have two concerns. 1) how far horizontally does this need to from the input for my 95% furnace (the furnace is a dual pipe configuration - intake and exhaust are both piped to the outside) and 2) can this unit exhaust 24" below an openable window. The window is a bump out 24" above the proposed vent termination.
thanks
The current location is now posing a trip hazard for my deck stairs in addition to being below the snow clearance height. There are several concerns that I need to consider with the new placement.
NFGC - Code states:
12.9.2 A mechanical draft venting system of other than direct-vent type shall terminate at least 4 feet below, 4 feet horizontally from, or 1 foot above any door, operable window, or gravity air inlet into any building.
12.9.3 The vent terminal of a direct-vent appliance with an input of 10,000 Btu/hr or less shall be located at least 6 inches from any air opening into a building, and such an appliance with an input over 10,000 Btu/hr but not over 50,000 Btu/hr shall be installed with a 9 inch vent termination clearance, and an appliance with an input over 50,000 Btu/hr shall be at least a 12 inches vent termination clearance.
explanation of the code: Subsection 12.9.3 permits the vent terminals of direct vent appliances to be located much closer to air inlets than is provided for with mechanical draft equipment. There is often a mis application of rules for mechanical draft to direct vent equipment. The vent gases from direct vent equipment disperse rapidly upon leaving the vent terminal, even when the terminal is located under an open window.
installation instructions/code also state that the exhaust needs to be 4' to the side of a combustion air inlet to any other appliance. also, 24" vertically to an unventilated sofit
What I cannot determine what my unit is classified as. It's listed as a "power vented gas water heater" but is it a "mechanical draft venting system' or a "direct vent".
I also have two concerns. 1) how far horizontally does this need to from the input for my 95% furnace (the furnace is a dual pipe configuration - intake and exhaust are both piped to the outside) and 2) can this unit exhaust 24" below an openable window. The window is a bump out 24" above the proposed vent termination.
thanks