Micheal, was there a heat or energy recovery ventilation system?
If so post the model number please. As well sensor wiring on the cabinet harness.
Where there any sensors on the wall? Pics if there were please.
Many times air tight homes require CFM air exchange.
Typically/usually even a duct with inline fan can be tied into the HRV/ERV system.
I take images of the exterior ducts.
Count the bathroom/s, HRV/ERV and subtract the vent wall ducts. One extra wall exhaust duct is typically an inline venting system.
ndegaris
(Neil DeGaris, CMI KY License # 102167)
51
Usually on the homes that i find that have a continuous fan will have a switch located under the cover on the fan itself that the homeowner can have control over, i have yet to find one that does not have this option but there may be some that don’t
I learned something today. Thank you. I’m down with the constant fan, here in SoCal everyone is super envioro-crazy and LEED is common, however I have not seen this in practice yet. When I do, I’ll know how to explain it to my clients. It will actually be a benefit for them.
Michael, Next time you’re at one of these, take the cover down. You’ll find 2 adjustments or controls. One for speed and one for time. Here’s how it works: The fan is on all the time at the lower speed. The switch steps the speed up to the pre-set 2nd speed. But if the pre set is set to low, there won’t be any change. If you adjust that control you’ll see the change. Its a soft start type so the speed change will be gradual. (It’ll take 15-20 seconds)
Then, turn the switch off. The speed stays high for a pre-se amount of time. That’s the 2nd control.
That’s why the fan behavior is what it is. I’ll let others comment on the good or bad of having such a system, but a laundry exhaust fan is required by most of our local AHJ’s around here. And that’s the type they install.
