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Old 10-10-2009, 01:06 PM   #1
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Furnace front clearance


Dear All,

My name is Carol. We just took over a construction project from bank. It is about 60-70% done. We are trying to pass the rough framing inspection next week.

This a 2 story duplex in San Jose, California. I noticed the furnace in 2nd story utility closet seats very close to the edge (about 2 1/2 inch.) I did some research on internet and find out the clearance at front of the furnace is suppose to be 6". I also looked up the manufacture specifications and it requires only 3" for the front clearance. But, after adding the thickness of the door, we only have 1 1/2 inch for the clearance.

The back of the furnace is already against the wall and have no space to move further. The unit is completed connected with pipes that goes to each room. It is very difficult to extend the back side of the utility closet to move the furnace.

Anything we can do other than push the wall out and move the furnace? May be have a different type of door for the utility closet?

Thanks in advance!



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Old 10-10-2009, 03:50 PM   #2
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Furnace front clearance


There should be a label inside the furnace that states the clearances.
Take the doors off of the furnace and look on the sides for the label.
Where does the furnace get it's combustion air supply from?

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Old 10-10-2009, 04:25 PM   #3
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Furnace front clearance


Should have 24" clearance from the front for service and a non combustible door with at least 1 sq ft. free air opening for combustion/100,000 BTUs.

Last edited by yuri; 10-10-2009 at 04:45 PM.
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Old 10-10-2009, 05:37 PM   #4
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Quote:
Originally Posted by yuri View Post
Should have 24" clearance from the front for service and a non combustible door with at least 1 sq ft. free air opening for combustion/100,000 BTUs.
I agree.
However, the furnace will still be serviceable with the door installed.
I think what the OP is looking for is clearance from combustibles.
The furnace is located on the second floor.
Even with a vented door, where would this combustion air come from?
Around here, we install a combustion air intake from the outdoors to the furnace area.
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Old 10-10-2009, 06:25 PM   #5
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Furnace front clearance


Depends how airtight the house is. A combustion air pipe is a very good idea as long as it does not get kinked/blocked etc etc. I would use a metal louvered door also.
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Old 10-10-2009, 07:04 PM   #6
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Quote:
Originally Posted by yuri View Post
Depends how airtight the house is.
There you go.
This is a new home.
Chances are it is well sealed.
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Old 10-10-2009, 08:16 PM   #7
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Rob, did you know all our furnaces will have to be 90% efficient Jan1/2010. Oh Joy! http://www.hrai.ca/
Check the whats new column. "Changes to furnace standards". Venting is going to be a huge pain in the azz with some homes.
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Old 10-10-2009, 08:45 PM   #8
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Hi All,

Thanks for the info provided.

Sorry for not been clear - the clearance is from the combustible.
I found 3" front clearance from combustible on the installation guide.
There is a opening to the attic to get the combustible air.

Thanks!
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Old 10-10-2009, 09:23 PM   #9
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Quote:
Originally Posted by yuri View Post
Rob, did you know all our furnaces will have to be 90% efficient Jan1/2010. Oh Joy! http://www.hrai.ca/
Check the whats new column. "Changes to furnace standards". Venting is going to be a huge pain in the azz with some homes.

Not trying to Hi-jack but I sure feel sorry for the headaches ahead for you guys in Canada. I can only think of the headaches here in the US if this standard was put into effect here.

On a side note I wish it was here. With all this stimulas money flying around here it should have went to the tax payers to do something like this than pad all the overpaid CEO's
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Old 10-10-2009, 09:34 PM   #10
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We have some overpaid politicians and Senators that are not worth their keep here. Going to make life interesting in some of the rowhouses that are close together/Archie Bunker type neighborhoods where they are 4 feet apart. It is always the poor people who get shafted.
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Old 10-10-2009, 09:47 PM   #11
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Yuri,

Are you sure you are not in the US.

Story sound pretty close to home.
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Old 10-10-2009, 11:43 PM   #12
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Ok, back to my question,

The manufacture required clearance from the combustible is 3".
The code is 6".
I only have 1 1/2". What can I do other than move the wall?

Thanks!
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Old 10-11-2009, 06:45 AM   #13
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yuri answered your question.
A non-combustible door.
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Old 10-11-2009, 09:14 AM   #14
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Furnace front clearance


If the door is solid/no louvers and very close to the front of the furnace it may interfere with the furnace's ability to suck air in for the burner and become a safety hazard as well as trip the pressure switch. A louvered metal door will allow sound into the house. A sealed combustion high efficiency furnace would be a better choice. It needs to be vented thru the roof or outdoors thru a wall. Life is not easy.
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Old 10-11-2009, 10:49 AM   #15
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Thanks a lot!

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