My HVAC guy installed these soffit vents for the bathroom exhaust fans in our new construction. https://www.homedepot.com/p/Everbilt-4-in-Spring-Loaded-Exhaust-Hood-in-White-BPSH4WHD/203626494 We have wrap around porches so they are actually installed in the porch ceiling near the outside edge. They look nice and are spring loaded so I appreciated what I thought they would do.
I also purchased some nice Panasonic exhaust fans https://www.build.com/panasonic-fv-0511vq1/s1400393?uid=3309191 that has an ECM controlled motor that supposedly can maintain ideal CFM's with regard to variable back pressure. 110 CFM.
My issue is that these exhaust caps only open 3/16" or so when the fan is running. I can't imagine that is enough space for a significant amount of airflow to exhaust from the bathroom. I'm not sure if the issue is spring pressure on the damper/lid, or negative pressure in the house. Entire house is spray foamed but we have make up air that is tied into each dehumidifier which is tied into each air handler on each floor.
Thoughts?
I also purchased some nice Panasonic exhaust fans https://www.build.com/panasonic-fv-0511vq1/s1400393?uid=3309191 that has an ECM controlled motor that supposedly can maintain ideal CFM's with regard to variable back pressure. 110 CFM.
My issue is that these exhaust caps only open 3/16" or so when the fan is running. I can't imagine that is enough space for a significant amount of airflow to exhaust from the bathroom. I'm not sure if the issue is spring pressure on the damper/lid, or negative pressure in the house. Entire house is spray foamed but we have make up air that is tied into each dehumidifier which is tied into each air handler on each floor.
Thoughts?