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usedTP t1_j9ujhdp wrote

If you keep the door closed, the vent fan won't move much air unless you cut some soffit vents or box vents down low. With the soffit vents you don't have to deal with shingles.

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AggravatingTart7167 OP t1_j9um54p wrote

Thank you both. Going to drill out some soffit vents (wood trim) and put in the gable vent. Probably looking at a new roof in the next two years anyway, so just trying to get things going in the right direction. No pun intended.

Put two in the attic in my old house for HVAC, it set the one at 120ish and seemed to run nonstop from June-October.

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nhskimaple t1_j9y49dc wrote

But do you have a flat soffit or a sloped soffit?? Sloped makes venting more complex and it’s completely untrue that you need soffit and roof vents for venting to work well.

Also it’s way way more complex to size all of this. Look in the IRC there is an entire code section on how to calc and what’s required Chapter 8

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Senior_Cheesecake155 t1_j9ukhul wrote

I'd imagine it depends on how the garage is oriented. You're right that only one vent fan won't work as it needs to pull air from somewhere. Typically a house with gable vents would have one at each end of the house. I'd look to go that route if the garage is situated like that.

I'm not sure what you mean about dealing with shingles, though. Gable vents are in the peak of the end wall, not on the roof.

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usedTP t1_j9ulf2o wrote

Box vents are on the surface of the roof.

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Senior_Cheesecake155 t1_j9umaue wrote

right, but OP said gable vent, not box vent.

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usedTP t1_j9umz9n wrote

And I said gable vent too. A gable vent requires a supply whether it is an open door, box vent, soffit vent, ridge vent, or gable vent on the other end. Have I covered everything?

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AggravatingTart7167 OP t1_j9v4d8e wrote

I’m good! Thank you.

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usedTP t1_j9vq59x wrote

That's good to know. If I can help you, I will. Thank you and have e a nice weekend.

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SpringNo1275 t1_j9wgwh7 wrote

Cable vents on both of the gables rely on each other for a cross breeze. Gable vents are not compatible with soft advent or ridge vent. If you have soffit vent and ridge vent, the gable vents must be closed off. I've been a roofer for 18 years

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