nospambob wrote:
I've seen the turbine turn when there was NO wind moving the leaves
outside though it was warm inside the garage. Turbines DO NOT NEED A
WIND TO TURN. Our garage didn't have any vents as built. Find the
definition of "convection" which is what warmer air rise.

No they don't need wind to move. The natural flow of warm air will
cause them to turn, but that turning is actually slowing down the movement
of the air, you would get more movement if you removed the part that turns.


On Tue, 24 May 2005 17:44:18 GMT, "Joseph Meehan"
wrote:

nospambob wrote:
The 20° drop IS appreciated almost daily. The outrush of hot air
when the roofer cut the hole was impressive!

Which is a really good indication that you did not have enough
high vents to start with. Likely any added vent, including passive
(ridge or any non-powered roof vent) would have done very well. The
turbine vents can add some additional venting when there is a wind.

--
Joseph Meehan

Dia duit