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There are two approaches to this problem: use dual pole switches to control the fan and each light simultaneously -- this is the best approach if the lights and fan all are on the same circuit from the panel use a dual relay to control the fan circuit from the light circuits -- this is the best approach if the fan and lights are on separate circuits, or if ...


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Sure, you could exhaust a jet engine through a 4" pipe but the problem is the velocity of the air. As the size decreases the velocity increases for any given cubic feet per minute rate of exhaust. So, what you have to do is calculate the velocity of the air through a 4" pipe given the CFM of the fan. And then will that velocity cause an objectionable ...


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I had this problem a while back - simple, use a two gang 2-way switch and wire the fan up as if it was a 2-way lighting circuit, one switch controls the fan, the other controls the light - no backfeed, fans operate when needed (client will have no automatic control however, unless you install a flush PIR in between switch and fan) Dont forget your 3-pole ...



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