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#102622 - 06/23/06 10:37 PM Alberta Exhaust Fan Interlock
CRM Offline
Member

Registered: 02/29/04
Posts: 73
Loc: Alberta Canada
The Alberta Building Code requires the principal exhaust fan to be interlocked with the furnace fan. An average size home usually has 2 bathroom fans upstairs, 1 downstairs. How do I determine what is the principal exhaust fan? Do I have to interlock all the bathroom fans with the furnace. On some newer homes I've seen there is a switch in the hallway, that somehow is wired in with the fan and furnace. What is the correct way to wire the fan and furnace in a new home. Thanks for any replies.

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#102623 - 06/24/06 11:13 AM Re: Alberta Exhaust Fan Interlock
dougwells Offline

Member

Registered: 05/03/03
Posts: 1228
Loc: kamloops BC Canada
This is about all i can help you with http://www.bcelectrician.com/furnace_fan_timer.html

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#102624 - 06/24/06 02:34 PM Re: Alberta Exhaust Fan Interlock
LarryC Offline
Member

Registered: 07/05/04
Posts: 776
Loc: Winchester, NH, US
Doug, do I understand this right? When the "principal exhaust fan" is switched on, the furnace fan must also come on. It is assumed that the furnace also supplies make up air.

LarryC

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#102625 - 06/27/06 05:33 PM Re: Alberta Exhaust Fan Interlock
crash Offline
Member

Registered: 10/21/03
Posts: 130
Loc: Calgary Canada
The Alberta Building Code does not say which exhaust fan must be used as the principle exhaust fan (it can be any exhaust fan in the home except the range hood fan). However the fan must have sufficient capacity to provide 50% of the total ventilation requirements of the home (ABC 9.32.3.4.(1)). And the switch must be centrally located (ABC 9.32.3.4(4)). Also two or more exhaust fans may be interlocked together so that they function simultaneously as the principal exhaust fan (ABC 9.32.3.4.(3)).

[This message has been edited by crash (edited 06-27-2006).]

[This message has been edited by crash (edited 06-27-2006).]

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