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#102622 - 06/24/06 01:37 AM Alberta Exhaust Fan Interlock  
CRM  Offline
Member
Joined: Feb 2004
Posts: 74
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 02:13 PM Re: Alberta Exhaust Fan Interlock  
dougwells  Offline


Member
Joined: May 2003
Posts: 1,140
kamloops BC Canada
This is about all i can help you with [Linked Image] http://www.bcelectrician.com/furnace_fan_timer.html


#102624 - 06/24/06 05:34 PM Re: Alberta Exhaust Fan Interlock  
LarryC  Offline
Member
Joined: Jul 2004
Posts: 783
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


#102625 - 06/27/06 08:33 PM Re: Alberta Exhaust Fan Interlock  
crash  Offline
Member
Joined: Oct 2003
Posts: 147
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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