Why do I have an air duct were my gas water heater is. The water heater is in a small closet about 2' by 2'.
Question:
Answers:
This duct supplies combustion air for the water heater. This is the outside air that the burning gas needs. It keeps the heater from drawing air from your living space, which draws outside air into your home, cooling it down in the winter.
burning gas gives off exhaust, which is vented out your water heaters vent stack.
For ventilation. (Gas flame burning inside)
Its mandatory in every room where there is a gas burning heater. The code is always the same because that little flame burning even if the heater is not working consumes oxygen and generates CO2 as exhaust plus other gasses. CO2 is lethal for people, therefore the law force you to have a vent in the 2x2 closet. The vent needs to be not higher than x amount of feet because CO2 is a "heavy" gas and will station on the floor...and needs to exit outside from there. If the vent is in the cieling...its ok but not good, you will not pass the home inspection. Its usually 2 ft from the floor max. But it depends. God forbit if you remove it! lol
the air duct (vent stack) on top of the heater vents the used gas from the heater you got to have it
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