If flat roof, what is the space and size that needs ventilation? If flat sounds like there won't be much natural air movement via convection..My roof is flat with soffits all around
Very familier with ac expense but never had noises from heat expansion and contraction - have lived in hot southern climes most all my life and through several houses. I can see where flat roof can get very hot due to no nature convenction air flow - hot air rises, but if flat you have no where for it to go. So some sort of powered ventilator may well be a good thing. I like the solar powered fan units.Live in warm climate, over 100 degrees in summer. Trying to both lower ac expense and quiet heat expansion and contractio noise in attic. Familiar with this?
I have 5 "pancake style" power vent fans. All are "Thermal Overload Protected"---Why would someone need additional protection with inline fuse.From what I have read and experienced with these type fans: They do work to move air through the attic area if the attic area is configured properly. They DO NOT work with ridge vents, understandably. IF you have both soffit venting and gable vents, they do not work efficiently as they will draw air from the source of least resistance. I have come across this situation and shown the homeowner the inefficiency of this. Blocking off the gable vents improved air flow via the soffit venting. One thing I will say: Most of these units have no provisions to shut off power IF the motor locks up, which is common with these. There have been a number of home fires in my area which were ruled as caused by these attic fan motors "locking up", then overheating and starting the fire. When I install, or replace a motor on, these I also add an inline fuse just for the fan motor. Depending on a circuit breaker, which may/probably has, other applications just is not safe to me.