Attic fan ventilation question


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Old 07-06-14, 11:33 AM
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Attic fan ventilation question

My father house attic from the top view the attic is shaped like a T. The fan is on one of the short ends of the T. I think the fan needs to be more powerful to pull the heat out of the attic. The roof is ventilated and the fan is over 30 yrs old. What should my father look for in a new fan to correct this issue? Size of motor etc.
 
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Old 07-06-14, 01:19 PM
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How is the roof ventilated ?

Soffet vents all along the soffet usually help
 
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Old 07-06-14, 01:29 PM
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It doesn't matter where the fan is located as long as it is in the attic and not boxed off in another space. The fan reduces the attic pressure EVERYWHERE in the attic. That lower pressure then works with a higher pressure outside to push outside air in through all vent openings. As PJ asked, what are those other vent openings?

Powered attic ventilators will also cause air inside your house to flow through leaks into the attic (expensive if you air condition). The correct solution is a search and seal effort between the house and attic followed by plenty of insulation, as well as being sure there is sufficient vent area.

Bud
 
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Old 07-06-14, 02:15 PM
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Ridge vent along peak roofline. The ends of the T are vented. He has the European style central air conditioning. I just feel the attic fan needs more power.
 
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Old 07-06-14, 02:27 PM
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Old 07-07-14, 07:09 PM
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The ends where the roofline meets the gutters are vented
 
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Old 07-17-14, 08:39 AM
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there are low vents so I guess the attic is ok. I was thinking he should replace or upgrade the 30+ year old fan to something stronger.
 
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Old 07-17-14, 08:51 AM
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You don't need a lot of airflow. It doesn't need to be a wind tunnel. You want a nice gentle flow of heated air leaving the attic being replaced by cooler air from outside..... not from inside the house.
 
 

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