ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Photocell
by Docholiday. 01/22/18 10:52 AM
AreMetal Ladders Ever OK For Electrical Work?
by gfretwell. 01/22/18 01:15 AM
VDE 0100 to introduce AFCIs
by sparky. 01/20/18 05:09 PM
MRI LED lights dimmer control replacement - wow!
by Potseal. 01/19/18 08:52 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 14 guests, and 15 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Furnaces in Garages Require FIre Dampers #154512
05/07/06 04:28 PM
05/07/06 04:28 PM
M
mhulbert  Offline OP
Member
Joined: Oct 2004
Posts: 132
Anaheim, CA USA
I've worked in a few houses, all built in the '80s that had the furnace in the garage. Typically, the return air would enter through a built plenum benaeth the unit, and there would be ducting abouve it going back into the house. My question is this: if the house requires 1 hour seperation from the garage, why were there no fire actuated dampers on the return and supply of these furnaces? Was the one hour seperation not required back then? Is there an exception for residences?

BTW, these were all located in southern California.

Thanks,
mike

Building Codes & Related References
Re: Furnaces in Garages Require FIre Dampers #154513
05/08/06 12:17 AM
05/08/06 12:17 AM
G
gfretwell  Offline

Member
Joined: Jul 2004
Posts: 9,167
Estero,Fl,usa
I suppose it depends on what code you are on but the "1 hour" fire rating usually only applies to dwelling space above a garage.
I have asked about fire dampers myself and that is what I hear. They use garden variety hollow core passage doors between the garage and mud room or laundry room here in Florida.


Greg Fretwell
Re: Furnaces in Garages Require FIre Dampers #154514
05/23/06 05:26 PM
05/23/06 05:26 PM
P
pwood  Offline
Member
Joined: Feb 2003
Posts: 67
castella,calif usa
mike,
302.4 exc#3 of the calif bldg. code(1997 u.b.c.)states no damper required if ducts are 26 guage and no openings in the garage.

Re: Furnaces in Garages Require FIre Dampers #154515
05/23/06 08:06 PM
05/23/06 08:06 PM
M
mhulbert  Offline OP
Member
Joined: Oct 2004
Posts: 132
Anaheim, CA USA
pwood,
I don't have the building code so let me ask some more questions:
-if the ducts are thicker than 26 gauge, is that OK?
-By no openings, do you mean that there are nor registers in the garage?

Thanks,
Mike

Re: Furnaces in Garages Require FIre Dampers #154516
05/24/06 11:06 AM
05/24/06 11:06 AM
P
pwood  Offline
Member
Joined: Feb 2003
Posts: 67
castella,calif usa
mike,
the 26 guage is a minimum thickness and no openings are allowed in the garage.no registers or returns,only the unit with supply and return directly to and from the house.


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
CDS
CDS
Nicholson Ga
Posts: 34
Joined: June 2006
Show All Member Profiles 
Top Posters(30 Days)
Admin 21
Potseal 15
sparky 15
Popular Topics(Views)
243,595 Are you busy
180,393 Re: Forum
170,862 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.028s Queries: 14 (0.005s) Memory: 0.9686 MB (Peak: 1.1064 MB) Zlib enabled. Server Time: 2018-01-22 18:07:27 UTC