Soffit venting


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Old 06-04-13, 01:32 PM
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Soffit venting

When installing soffit vents to make use of the ridge vent we have, should the slits in the soffit vents face towards the house or away. Or does it matter?

Thank you
 
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Old 06-04-13, 01:38 PM
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Interesting question; I had to go look at mine to see what they look like. Mine are non-directional, so no help to compare. My inclination would be to face them out, but let's wait and see what one of the pros has to say.
 
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Old 06-04-13, 01:55 PM
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Not a pro, but I would face them towards the house. They will look better, similar to a return air vent facing the floor on an HVAC system. I don't think it will affect the airflow to the attic either direction.
 
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Old 06-04-13, 04:17 PM
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Under natural pressures the air flow is so slow it doesn't matter. However, wind driven ventilation can be good or bad. It can greatly increase the air exchange, but includes the risk of moisture being carried in. On average, facing out will pose little risk and improve your ventilation. But, if you have steady moist air, say fog off the ocean, then face them inward to reduce the risk. Light fluffy snow can also follow a stream of air and accumulate to some scary amounts. First hand experience.

I checked your location and it doesn't look like snow is a big concern, MS.

Since you probably use air conditioning, how much vent area (NFA) do you have high vs low?

Bud
 
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Old 06-04-13, 04:19 PM
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I agree with Tolyn... if the louvers are parallel with the house, you install them so that you can't see straight up into the soffit, just like a cold air return in the baseboard... so that you can't see straight into the ductwork.
 
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Old 06-05-13, 06:19 AM
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Not sure what "vent area (NFA) do you have high vs low" so I can not answer the question.
 
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Old 06-05-13, 06:56 AM
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NFA means Net Free Area. All vents have that on the packaging somewhere. It's basically the amount of open area to allow airflow. If it was a vent with a single louver 1/2" wide by 12" long it would have an NFA of about 6 sq in.

You want your intake to be at least as big as the exhaust or bigger.
 
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Old 06-05-13, 12:43 PM
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Right now there are no soffit vents, but do have a ridge vent so I will need a large number or a continuous soffit vent. Thanks.
 
 

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