Jerry Simon Posted August 26, 2020 Report Share Posted August 26, 2020 Doing new construction year-end warranty inspections for several houses in same subdivision. One complaint was that the bath exhaust fan, in only one bath of three, never turned off. Builder said this was normal. You know what I said. Just did another one in the subdivision, and one of the bath fans, different location from above, didn't turn off when its toggle-switch was turned off. Homeowner said her handyman *adjusted* the fan, and now it still runs for at least a half-hour before turning off. Any help understanding this would be appreciated. Quote Link to comment Share on other sites More sharing options...
Tom Raymond Posted August 26, 2020 Report Share Posted August 26, 2020 They make run timers that keep fans on for a set countdown after turning off the switch. Could become of these. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted August 26, 2020 Report Share Posted August 26, 2020 Perhaps it's just an Oregon thing, but timers or humidistats have been required on bathroom exhaust fans for a least two code cycles. 1 Quote Link to comment Share on other sites More sharing options...
John Kogel Posted August 26, 2020 Report Share Posted August 26, 2020 Believe it or not, the BC building Code requires the bath fan to run continuously in new construction. I think it has to do with off-gassing. Houses are built tight and locked up all the time. It is pretty standard practice to bypass the fan switch until after the code inspector has done his final inspection. 🤓 Sometimes the electrician or builder doesn't get back to installing the switch and the fan is found to be going strong a year or two later. Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted August 26, 2020 Report Share Posted August 26, 2020 Is there a provision for make-up air or is the fan just churning? Quote Link to comment Share on other sites More sharing options...
John Kogel Posted August 26, 2020 Report Share Posted August 26, 2020 (edited) Right, there needs to be an air vent, usually in a closet. I built an addition to my 1984 house in 2016 and had to install both those things in the new part for final approval, no big deal, actually. Fresh air in the closet with a vent you can screw shut any time. Edited August 26, 2020 by John Kogel Quote Link to comment Share on other sites More sharing options...
ejager Posted August 26, 2020 Report Share Posted August 26, 2020 (edited) We've got a switch next to the thermostat that turns on both the bath exhaust fan and the furnace blower motor. The switch in the bathroom won't turn the fan off if this switch turns it on. There is a fresh air intake on the return air system ahead of the furnace. I explain is as the switch you use when the heat and/or humidity levels necessitate an active changing of the air in the home - such as when you are having a house party. Most people seem to get it Edited August 26, 2020 by ejager Adding make up air info Quote Link to comment Share on other sites More sharing options...
Jim Baird Posted August 26, 2020 Report Share Posted August 26, 2020 During my visit to Dublin, Ireland I stayed in lodging where the light and exhaust fan came on when you opened the door and stayed on after your exit. Quote Link to comment Share on other sites More sharing options...
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