Jeff Remas Posted January 4, 2009 Report Share Posted January 4, 2009 You are inspecting a 20 year old home that is not considered to be unusually tight construction. The family has recently finished the basment and has framed around the utility area creating a separate, nice size utility/mechanical room of 12'x12' with 8' ceilings. The room is sealed from the rest of the basement. All combustion air comes from within the room. In the room is an electric hot water heater and a gas fired hot water boiler for the hot water baseboard. The boiler has a 60,000 BTU input rating and a 52,000 BTU output rating. We now know that there is not enough combustion air available in the room. The boiler needs 3000 cu feet of combustion air and only has 1152. The homeowner has decided to bring in fresh air from the outside for combustion air. What size opening to the exterior is needed to accomplish this? How can this be accomplished. Quote Link to comment Share on other sites More sharing options...
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