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Thanks I just checked with Bradford White and they specify 2 in^2 / KBTU of vent area per grill high and low if your exchanging air internally or 1 in^2 of area if your exchanging from outside. 40,000 BTUs = 80 or 40 in^2. So a 10 x 10 vent should be good. Would a larger vent be better? So I...

Terry, Thanks for the info. So it sounds like the only way to remove the heat generated from the water heater is temperature controlled exhaust fan system?

Terry, Thanks for the clarification. The side wall to the left of the water heater is an exterior wall. Could I convert the current venting to a direct vent through the exterior wall to the outside like this image to help reduce the heat build up in that room when the water heater is running...

below are image of the water heater, the exhaust pipe from the water heater is 3"

We recently had a 25 year old 50 gallon gas water heater replaced with a Bradford White with a direct vent. The water heater is in the laundry room which is about a 8 x 8 room inside the house. What we are now noticing that when the laundry room is closed, that room gets really hot. The source...