On Sun, 16 Apr 2006 21:45:29 -0500, "HeyBub"
wrote:

rob wrote:
On Sun, 16 Apr 2006 15:53:41 -0500, "HeyBub"
wrote:

CJT wrote:

Put up a turbine. A decent 12" one with ball bearings will do a
great job.

If by turbine you mean those gadgets that spin in the wind, I
disagree; they seem pretty useless to me.

"Depending upon the diameter of the vents and the wind speed
outdoors, the turbines can expel vast quantities of humid air...

"A small 12 inch diameter turbine vent with a constant wind speed of
5 miles per hour (mph) can remove 347 cubic feet of air per minute
(cfm) from the attic space. A single 14 inch diameter turbine vent
that is subjected to 15 mph winds can expel up to 1,342 cfm of air!

"If the winds are still, the vents still allow air to drift up and
out of the attic space..."

A roof turbine operates at no cost, requires zero maintenance, and
lasts for many, many years.

Well yes and no. As another poster said, for winter, you will have to
have a way to cover it or cut off the circulation so the cold air
doesn't get in.

"Ventilating attic spaces in winter months is often more important than
venting them in summer.



Agreed. I don't think one should cover them up unless the attic is
finished and heated. For some reason, I was thinking of a finished
(heated) attic in my original post but didn't say that so it was a
misleading statement and not applicable in ALL situations.