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Old 11-11-2019, 12:16 PM   #1
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Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thoughts


I already have an attic exhaust fan (temperature controlled set at 80 degrees F).

It still gets hot up there and I have things in storage up there such as pictures and all holiday decorations, books, tables/chairs, clothing.

I was thinking of their installing a fanless vent on the opposite side of the house of where the exhaust fan is OR I was going to go one step further and install
a temperature controlled AIR INTAKE fan to pull air INTO the attic to make it even cooler.

(Im in New Jersey USA).

Thoughts?
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Old 11-11-2019, 12:41 PM   #2
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


Talk about your venting, ridge vents, soffit vents whats there now eh? (I think that's how Neal would say it )
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Old 11-11-2019, 01:56 PM   #3
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


Quote:
Originally Posted by 3onthetree View Post
Talk about your venting, ridge vents, soffit vents whats there now eh? (I think that's how Neal would say it )
The house is a ranch.
There are vented soffits on all four sides where air comes in
such as in these images attached.
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Old 11-11-2019, 02:27 PM   #4
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


Is the second picture original plywood soffits and you boxed them in with the new perforated lapped panels?
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Old 11-11-2019, 03:30 PM   #5
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


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Originally Posted by 3onthetree View Post
Is the second picture original plywood soffits and you boxed them in with the new perforated lapped panels?
My bad, that is from Google, not my house.
The second image with boxed in panels is not my house.

My house has nothing covering the inside of the vented soffit siding.
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Old 11-11-2019, 03:49 PM   #6
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


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My bad, that is from Google, not my house.
Good, cause I couldn't figure out if that was a treated 4x4 as a fascia board.

Do you have upper vents - ridge cap or box vents? How close is the power vent to them? Are all the lower soffit vents clear from insulation or any wood blocking (from the attic can you see light between the heels of the rafters)?

Backing up, what is the higher attic temp causing? Have you taken the temp, or just hear the power vent running from mid-morning to dusk on a hot day? A difference of 20d is not cause for alarm in itself. Is getting it "cooler" just for the stored stuff?
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Old 11-11-2019, 04:15 PM   #7
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


The third picture shows two roof lines above the soffit pictured. Is that your house? If so can you give us a whole house shot or two. I'm concerned that the soffits are actually venting into the attic.

Also as 3-tree asked, what do you have for high soffits?

And where are you? Cold climates also need winter ventilation and 80 isn't going to work.

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Old 11-11-2019, 09:03 PM   #8
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


Quote:
Originally Posted by 3onthetree View Post
Good, cause I couldn't figure out if that was a treated 4x4 as a fascia board.

Do you have upper vents - ridge cap or box vents? How close is the power vent to them? Are all the lower soffit vents clear from insulation or any wood blocking (from the attic can you see light between the heels of the rafters)?

Backing up, what is the higher attic temp causing? Have you taken the temp, or just hear the power vent running from mid-morning to dusk on a hot day? A difference of 20d is not cause for alarm in itself. Is getting it "cooler" just for the stored stuff?

All 3 photos are not my house unfortunately.
There are no "non moving/dead" vents on the roof anywhere.
Just one exhaust fan on the roof off center to the West.
I have no other "openings" to all air in.
The attic temperature is comparitively cool compared to other attics
because I have the exhaust fan temperature sensor gauge set to very low (like 80 degrees F).
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Old 11-11-2019, 11:27 PM   #9
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


The static air vents on the roof are there to exhaust the hot air. The soffit vents are the intake to allow cooler air to be drawn into the attic where it is exhausted by the static vents (and your power vent). Looks like you need to add some static vents on the upper roof or a ridge vent to allow the warm moist air to exit the attic.

I have a power attic fan in my upper attic (tri-level house) and I have it set to run at something like 105 degrees. It only runs during hot summer days or days where it's warm out with lots of direct sunlight. I have a remote temperature probe up there and it reads 32 degrees right now, where the outdoor temps are at 18 degrees. In New Jersey it looks like the temperature was in the mid 60's today. If your attic temps were in the 80's you definitely need some more vents. Is your insulation adequate for your climate?
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Old 11-12-2019, 06:29 AM   #10
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


I think you should store heat sensitive things some place else. Maybe the photos? I also didn't know the exhaust thermostat can be set that low. If you are that worried about things, attic should be renovated into a conditioned space and AC.
If the exhaust fan is rated for 1000 cfm, you should have corresponding inlet. Check the websites for the chart. Inlet does not have to be active, just a hole. Your soffit and ridge vents, if you have them, counts into the equation. If you have vented soffit covers, make sure the soffit is fully open. Sometime, holes are cut into soffits and just covered with vinyl.


BTW, if attic air is circulate, it also brings in moisture. Books and such may get damaged. I don't mean water damage but could get moldy.

Last edited by carpdad; 11-12-2019 at 06:31 AM.
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Old 11-12-2019, 09:11 AM   #11
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Re: Attic Fan Question: Already have an temp controlled exhaust fan - Intake fan thou


Can we clarify? If I am reading correctly, you have vinyl soffit vents to let air into the attic. You also have gable vents on each end of the attic, one of which has an exhaust fan. No ridge vent, or roof vents. You're asking if you should put an intake fan on the opposite gable vent?

IME, facts is just facts—the attic will get hot, unless you insulate the heck out of the roof.

Last edited by huesmann; 11-12-2019 at 09:13 AM.
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