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Old 05-13-2021, 06:03 PM   #1
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Possible FIRE HAZARD

I have a 2015 Columbus 375RL with a propane furnace. I took a look under the furnace and the floor is burnt. The furnace is mounted about 1 1/2 inches above the linoleum floor. See pictures, I would not use your furnace until it is inspected. See the bottom picture you can see the color of the floor in my camper, compare to floor under the furnace.

Possible FIRE HAZARD


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Old 05-14-2021, 08:17 AM   #2
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I can understand your concern from the pictures I don't see any burning I do see the floor has appearance has changed I suspect due to the proximity of the bottom of the furnace. Not unlike color changes in areas with direct sunlight. you could very easily install some 26 gauge sheet metal to cover the area under the furnace.
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Old 05-14-2021, 08:25 AM   #3
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Yes, I can see where the floor is heat discolored. At a minimum I would inspect the heat exchanger in that furnace for a possibly crack.
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Old 05-14-2021, 08:28 AM   #4
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Is photo #1 with the furnace removed?
If so, what does the furnace case look like?

I'm not saying there isn't an issue but there have been several reports of discoloring vinyl flooring just from sunlight. It could also discolor from heat.

I'd want to reserve judgement until I seen what the furnace case looks like.
If it is discolored too, then you better be looking into the inside.
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Old 05-14-2021, 09:52 AM   #5
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burnt floor

I noticed the floor under the furnace looked burnt. There is a lot of heat that comes out of the bottom of the furnace when it is running. I am very surprise that the furnace is mounted so close to the floor with no heat protection. I put a piece of tin on the floor under the furnace. My post was a heads up to check your furnace, I don't want to see anyone have a fire. The pictures are with the furnace in place the last two pictures are rotated 90 degrees. It would be interesting to know what the furnace manufacture specifications are for clearances.
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Old 05-14-2021, 10:14 AM   #6
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I found a picture on line it show that usually there is a hold under the furnace i/e the floor for heat to go downward. But when they installed the furnace no hole for heat to flow. So it blows on the floor.
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Old 05-14-2021, 10:45 AM   #7
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Quote:
Originally Posted by ajaxzcars View Post
I found a picture on line it show that usually there is a hold under the furnace i/e the floor for heat to go downward. But when they installed the furnace no hole for heat to flow. So it blows on the floor.
Don't know anything about a hole beneath RV furnaces. This is the only precautions to take for an RV Suburban furnace.

3. When an appliance is installed directly on carpeting, tile or other combustible
material, other than wood flooring, the appliance shall be installed on a metal or
wood panel extending the full width and depth of the appliance. If preferred, the
carpeting, tile or combustible materials, other than wood may be cut away the
full length and depth of the appliance plus the appliance minimum clearances to
combustibles.
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Old 05-14-2021, 01:14 PM   #8
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Some R/V furnaces that are designed to be floor mounted to work with an in floor ducting option do in fact, have a removable panel (knockout) on the bottom of the furnace to allow the air to blow directly into the in floor duct.

Furnaces utilizing the flexible (slinky) ducting does not get that panel removed.

The OP mentioned a lot of air blowing out from under the furnace.
I think I'd try to see if that floor knockout was removed by mistake or possibly came loose.

I'll again mention, I'd be looking at the outer case on the underside of the furnace for clues.
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Old 05-14-2021, 01:54 PM   #9
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here is the picture I found on the web. The furnace blows in the floor duct.
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Old 05-14-2021, 03:57 PM   #10
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I don't think the opening is on the bottom. The unit says vertical mounted which would mean the side openings are still used. Oh well.
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