Gauranteed to eliminate all odours and heat in less than 10 seconds
First time you’ve seen one Jim?
Never seen a set up like this. It was in a 3 season cottage
They were quite common around here at one time.
They work great and can reduce the need for air conditioning a lot if your area cools off in the evening.
I thought it was a handymans idea. It did work well at cooling the place off.
They were popular here in 70’s and 80’s. I recommend these for cold months.
http://www.pesinc.org/Seal_A_Fan(Whole_House_Attic_Fan_Cover).htm
http://www.conservationstrategies.com/ShutterMate-Insulated-Whole-House-Fan-Cover/productinfo/3538/
Thanks for the info guys.
I have the exact same one in my house Jim…works great…cools the house off in 5 mins in spring and early summer…never …ever…turn that thing on in winter…ever…
I often see these installed in a home built with engineered trusses. Generally they will only have to cut through one to make it fit but sometimes they cut two 
Over 30 years of renovation experience and i have never seen this before. We are always learning in this business
Very common here also in the homes around mid 70’s. Always found in hall ways to pull large amounts of air out in the summer.
I see them here at least once a week and have one in my own house they are intended to be used only with open windows as they will put the home in a negative pressure and can cause back draft on gas WH
Attic fan.
That’s not really the correct term. An Attic Fan is used for ventilating the attic.
The one Jim posted is called a Whole House Fan.
That is correct Christopher however I have seen the Attic Fans that do ventilate the attic not the home of heat. Turbo vents have replaced this practice.
I feel turbo vents should never be installed in Canada.
The wind blows and the negative attic pressure pulls heat and moisture from the home .
Yes Roy if they don’t have proper soffit vents you are correct and this should be noted on the report.
That’s what their purpose is, to ventilate the Attic, Not the home living space.
Quote:
Originally Posted by kwood http://nachi.cachefly.net/forum/images/2006/buttons/viewpost.gif
*That is correct Christopher however I have seen the **Attic Fans that do ventilate the attic not the home of heat. *Turbo vents have replaced this practice.
http://www.buildingscience.com/documents/published-articles/pa-crash-course-in-roof-venting[FONT=AvenirLTStd-Heavy][size=1][FONT=AvenirLTStd-Heavy][size=1]
[size=3]step 4
[/size][/size][/FONT][/size][/FONT][FONT=AvenirLTStd-Medium]Building codes suggest balancing the intake and exhaust ventilation.
The code, however, is wrong, and I’m working hard to get it changed.
More ventilation at the eaves than at the ridge will slightly pressurize the attic.
A depressurized attic can suck conditioned air out of the living
space, and losing that conditioned air wastes money.
For best results, provide between 50% and 75% of the ventilation space at the eaves; a 60/40 split is a good sweet spot.
The code specifies 1 sq. ft. of net free-vent area (NFVA) for
every 300 sq. ft. of attic space.
(Keep in mind that different vent products have different NFVA
ratings.)
Here’s how to do the math for a 1200-sq.-ft. attic.
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Agreed Roy!