If your attic soars above 100 degrees and reaches the 150 mark its time to consult.
Do attics need more than 1 attic fan.
Without exception you should talk to a professional to determine what your home requires.
As wind passes over an externally baffled ridge vent it creates low pressure zone drawing air from the attic.
I also tested the ceiling fan and the recessed lights didn t have covers and not sealed and there was a 1 4in gap around the lights and still no pull of smoke.
The moving air tries to cool down all the wood attic framing as without the fan the temperature.
Attic insulation that is less than r 19.
That paper notes data measured at fsec and elsewhere show that attics with nominal natural ventilation and at least r 19 ceiling insulation do not need powered vent fans.
In some worst case instances attic fans can actually create more problems than they solve.
With the attic fan on i tested the outlets and light switches in two rooms below the attic fan and the smoke puffer didn t get pulled.
Does my home need attic ventilation fans.
That said air resistance and interference such as vent grates reduces the area of true ventilation.
For more natural exhaustion of the fans air outdoor you may need to increase the attic ventilation to 5 or more attic vents than the common area for proper functionality.
Ideal attic temperatures shouldn t be more than 10 to 20 degrees hotter than outside temperatures.
However there are certain circumstances where they can prove useful.
Attic ventilation fans could be effective if your home has.
It may be starting to sound like attic ventilation fans aren t worth the hassle and could cause more problems than they solve.
Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation.
The faster the wind moves over the baffle the greater the pressure it creates.
Also you should buy or build a tight sealing cover if your whole house fan doesn t have one.
If you want your home air conditioner to cool you better then you might want one or two attic fans.
If however the ridges are more than 3 feet apart in height only ventilate the higher one or separate the attics.
Such fans cost more to operate than they save in reduced cooling costs so they are not recommended q.
