If your air intake is close to the peak, it will create a low-pressure area, right under the ridge vent.
Especially if other air sources (vents) aren't close enough to the low-pressure
area to normalize the pressure.
The amount of outdoor air pulled in, will depend on the type of ridge vent.
If it's designed for a lot of flow thru, back-wards flow will happen.
That might not be good during a windy rain storm.
Make sure you have a humidity sensor on your blower control hardware.
My ridge vent is 40 feet long, so the blockage is a small percentage of the total.
I've never had any moisture problems in the attic, during the 35 years,
before we had the ridge vent installed..
So, I could block up a lot more of the vent if I really needed to.
Anyways, you can use sensors and tell if back-wards flow is occurring.
If the sensor near the vent shows 70F air, but 60F air is being pumped down,
there is cold air mixing going on.
After I plugged up the ridge vent close to the intake,
the heat of the air being pumped down, was the same as the peak sensors were showing.
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My hobby is installing & trying to repair mini-splits
EPA 608 Type 1 Technician Certification ~ 5 lbs or less..
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