"Reading the Invisco description you will find that it is designed to be surrounded by cellulose to cover the bottom damper entirely. The thermally broken assembly allows the top damper to be freezing while the bottom one is at room temp.
I think cost of operation is always a factor but I am not sure I would leave it just cfm. What about watts to operate? What about the heat/cold transfer from the attic? What about the perfect connection of conditioned to unconditioned space I…"
You are the first person who has ever told me they prefer lower CFM. What you left out is that their price in dollars per CFM is the highest in the industry.
You will be interested to know that Invisco has R50 insulated dampers…"
I just searched this forum for "Whole House Fan", but I didn't find much about them (except this and this).I'm curious to hear what experiences you all may have with these simple and relatively inexpensive devices out in the real world.Here are some pictures and a basic definition of the…See More
"I no longer have my subscription to the Home Power Magazine but these figures were pulled from the article that was once linked including that a screen requires increasing size for flow. The resistance of the screen reduces flow. It is in the…"
I read your blog with some interest. You say
" Per the Home Energy Magazine article referenced for this page lets go with a 4,800 cfm fan. We need a minimum of 6.4 square feet of free air for the unit to run proper.…"
"I do not like them and I am in Southern California. I think the whole house fan in prescriptive measures for title 24 3013 is a colossal mistake.
My blog regarding whole house fans here http://www.rede3.com/Whole_House_fans.html
Is this really the link you offered?
About compromising the thermal boundary, there are two sources for very effective R rated ceiling interfaces - one offers a clamshell motorized…"
"Tom, great new post! Thank you for the focus.
As you know, the term "whole house fan" is a unique "long tail keyword" that describes a very specialized ventilation system.
For the record, the CEC IS just about the most…"
"Excellent snapshot, Griffin. You didn't happen to notice the fan manufacturer's name on this one, did you?I am more familiar with the traditional louvered units that install in the ceiling plane, but I have been interested in these newer…"
"I was aware of but unfamiliar with them until moving to Southern California in 2012. After seeing several dozen of them, I can get behind their theory of operation, although I don't like the trade off of a compromised thermal boundary. From the…"
"In Connecticut’s climate, I am not in favor of them .
Either they are the big old style that move 3-5000 cfm and are not easily insulatable, or they are newer ones that seal and are somewhat insulated, but move a lot less air.
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