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amazinlittledevil 01-04-2007 08:24 PM

Building walls around a furnace
I am finishing off a basement and want to enclose my furnace in a room with a door. Does anyone know how far from the furnace the wall should be?

#CARRIERMAN 01-05-2007 08:27 AM

Hi amazinlittledevil

If you can find the owners manual to your furnace, inside the manual will be the clearance guidlines. My preference as a servicer, is enough room to comfortably service the equipment or change it out. But I believe the standard rule is 3" back and sides 18" front and 24"top. But like I said, check your manual first, this may not apply to all furnaces.

Good luck

amazinlittledevil 01-05-2007 03:10 PM

Thanks I'll try that.

redline 01-05-2007 04:21 PM

Depending on the type of furnace you may have to allow for air to enter this enclosure.

concretemasonry 01-05-2007 05:16 PM

If you have a fresh air intake into the area around your furnace, you may be required to insure that the fresh air (usually cold) gets to the furnace and is not spread into the rest of the basement.

This helps with energy, CO and venting.

amazinlittledevil 01-05-2007 05:49 PM

I do know it has a fresh air intake from outside going directly into the funace, its a white PVC pipe that reads "intake". There is also ont that reads "outlet". I'm assuming this is the fresh air for the combustion. The funrace also pulls return air from many return vents in the house. I do now that Im going to have to provide some fresh air for the gas water heater that is in the same room right next to the furnace. Im just not sure how to do that?

trollmastergeneral 01-05-2007 06:51 PM

What you should do is get two 4 inch fresh air vents.Then you can get 4 inch insulated flex to run into your mechanical room.One vent you will want up high the other you will want by the floor.:thumbsup:

amazinlittledevil 01-06-2007 10:54 AM

Once I box in this mechanical room I will have a large open space in the basement. Should the vents pull air from that space into the mechanical room or from outside?

trollmastergeneral 01-06-2007 04:36 PM

codes usualy require you to pull the fresh air from outside.The reason for this is so the air that is taken from the house and sent up the chimney is replaced so there isnt a negetive presure in the building

#CARRIERMAN 01-06-2007 04:50 PM

Hi amazinlittledevil

All the points that these guys brought up are extremly valid. You have one advantage that would make your inclosure alot easier. Apparently the furnace you have is a 90 plus furnace and does not require another source for combustion air. This will save you a ton of trouble. But without adding the combustion air into the closet you ar limited to this style of furnace, but with fuel costs skyrocketing, thats not a bad thing.

Good luck

concretemasonry 01-06-2007 04:55 PM

Building walls around a furnace
amaxinlittledevil -

Keep in mind the difference between "vents" and cold air returns.

Vents supply air for combustion.

Cold air returns allow the cold air in a room get back to the furnace to get reheated and recirculated. If you do not have returns in your basement, it can be hard to heat and the air will be stale.

The two (vents and returns) are separate and should not be confused.

trollmastergeneral 01-06-2007 04:56 PM

I beleive there is a water heater that still needs make up air

amazinlittledevil 01-06-2007 05:14 PM

The furnace has both supply air for combustion and return air vents. The return air vents are located in the upstairs as well as the basement. The fresh outdoor air for combustion goes directly into the furnace with a white pvc pipe. I now that the furnace has everything it needs to operate in an enclosed space. Im just not sure what i need to do to provide to the water heater once I close in this area with walls. Will this small room need frehs outside air or can I simply draw air in from the the rest of the basement via some vents in the walls that I build around the furnace and water heater.

Its the water heater I need to know about.

#CARRIERMAN 01-06-2007 05:22 PM

Hi amazinlittledevil

You will want to bring fresh air into it for the water heater from outside the house. Sorry, I about mislead you there. Trollmaster was on the money with his response.


amazinlittledevil 01-06-2007 07:03 PM

Thanks everyone for the good advice.

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