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JLewis

03:49PM | 09/19/00
Member Since: 09/18/00
1 lifetime posts
Bvhvac
I have a 100 year old house with a boiler almost as old. I will be doing a complete renovation includeing replaceing the heating system. I have baseboard hot water in about one third of the house. How do i design a central air system , includeing size, ducts, returns, and vent placements?

Thank for your help!
Jon

HOLLYWOOD

04:00AM | 09/23/00
Member Since: 02/19/00
206 lifetime posts
Size A/C needed: Rough estemate only:
L X W X H X (6) div by 60 min div by 400 cfm= TONNAGE REQUIRED. The figure of (6) is air change per hour and is usually 5. Since your house is older I made it 6.
Once you find you tonnage needed, Now youcan start sizing duct. There are charts for this.
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