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Thank you for these replies. I agree that I could have substantial 'make up air vents' just in doors that don't shut well, gaps over basement windows, and lots of other places. I also agree that...

Hi, I have a large Victorian home (3800 sq ft) that was gutted and foamed, has high insulation storms and some basement insulation, so it is fairly tight. However, with 9-10 foot ceilings and a...

A client would like to install 6 Rinnai LP DVs on 2 levels for a total of 3500 sq ft heatable space and an overall BTU load of 143K. The rooms are all very large with excellent passive air flow. ...