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re: suggestions on cutting energy bill --
21 jan 2006
wrote:
>one other thing not mentioned yet is thermostatically-controlled attic
>ventilation. works great for me in sw ct, so i don't know how you
>survive without one from june to october in tx.
anything you can do with a fan can be done with soffit and gable vents,
with no electrical energy. with a ft^2 of vent area at top and bottom
and an h' height diff and dt (f) temp diff, cfm = 16.6asqrt(hdt).
for example, an attic with 2 2'x2' gable vents and equal soffit vent area
and h = 8' and dt = 10 f would have 16.6x2x2x2sqrt(8x10) = 1188 cfm of
airflow. i'd close the gable vents in wintertime with plywood doors
hinged at the top.
nick
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