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10-01-2016, 01:42 PM
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#1
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Seasoned Camper
Join Date: Jun 2012
Location: Devon
Posts: 92
M.O.C. #12573
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Air circulation
Hi All: We have a 2013 Montana 3800RE. We have a problem with air flow from between the stairs up to the bedroom. It is very chilly. The rig is winterized by Keystone at the factory.
I plan to block these vents. This area, in front of the stairs and the door, is the coldest spot in the rig and just below the thermostat.
Question. Is this air combustion air for the furnace ? Thanks for your help.
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10-01-2016, 03:05 PM
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#2
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Yes, that is the return air for the furnace. We block ours off in the summer and open it up in the winter when we change our floor vents from ones that shut to the ones that don't.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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10-01-2016, 04:39 PM
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#3
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Montana Fan
Join Date: May 2016
Location: Massillon
Posts: 437
M.O.C. #18658
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Combustion air is from outside the RV and is exhausted outside. The return air for the heat exchanger is under the stairs.
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10-02-2016, 12:37 AM
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#4
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Montana Master
Join Date: May 2011
Location: Hixson
Posts: 3,436
M.O.C. #11397
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I do the same as Dick blocking in warm months and not block in cold.
__________________
2018.5 Montana 3791RD
Full Timers 9/1/2010 through 1/16/2020.
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10-02-2016, 03:13 AM
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#5
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Montana Fan
Join Date: May 2016
Location: Massillon
Posts: 437
M.O.C. #18658
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In other floor ducted RV's none of them have exhibited the issue where you have to cover the floor registers for supply and return air to the furnace to keep the AC working. The fact that most owners report this working seems to indicate there is large outside air leakage into the ducts or basement duct area. Does anyone know the cause of this issue and is it worth trying to insulate or fix?
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10-02-2016, 05:34 AM
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#6
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Montana Master
Join Date: Jul 2010
Location: Lake Havasu City AZ.
Posts: 1,811
M.O.C. #10552
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Now I am confused?? In my 3582RL the heating and AC are two completely independent systems. The heating system is in the floor. And the AC system is in the ceiling no connection between the two except both are controlled by the thermostat. I did remove the wall between the basement and the main part of the RV and insulated that area. I also put filter material behind the intake vents under the stairs.
But maybe I am missing something here or just can't understand just what you guys are talking about?
__________________
Wayne and Ann Moore
2015 Ford F-350 King Ranch
Firestone air bags, bed saver.
Add 40 GAL tank in bed.
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10-02-2016, 06:13 AM
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#7
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Montana Master
Join Date: Jun 2014
Location: Vancouver Island
Posts: 894
M.O.C. #14417
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I followed the suggestions made by dieselguy http://www.montanaowners.com/forums/...rchTerms=vents and it solved the problem you are having Golferdave.
__________________
Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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10-02-2016, 09:26 AM
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#8
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Montana Fan
Join Date: May 2016
Location: Massillon
Posts: 437
M.O.C. #18658
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Is the heat duct in the floor insulated or just uninsulated sheet metal?
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10-02-2016, 09:37 AM
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#9
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Montana Master
Join Date: Jul 2010
Location: Lake Havasu City AZ.
Posts: 1,811
M.O.C. #10552
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Lenny K, that is the mod I did also. Got the idea from dieselguy. Have done it on my last two rigs. Makes a huge difference.
__________________
Wayne and Ann Moore
2015 Ford F-350 King Ranch
Firestone air bags, bed saver.
Add 40 GAL tank in bed.
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10-02-2016, 10:37 AM
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#10
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Montana Master
Join Date: Jun 2014
Location: Vancouver Island
Posts: 894
M.O.C. #14417
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It sure stopped all the drafts and as a bonus it blocked off the easy access point for rodents.
__________________
Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake
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10-02-2016, 11:09 AM
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#11
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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The metal duct in the living room is up against the floor and encased below that...at least on mine james. Dave, the floor in front of the door is pretty thin since the entry stairs fold up under it. The vented stair risers do let in a bunch of cold...especially if you have six point leveling where four of those leveling rams have huge holes into the underbelly and passthrough. ALSO...look between the bottom stair and the side wall of the entry closet. On mine, there was an opening about an inch wide by at least six inches tall. I crawled in behind that area from the passthrough and glued in a piece of wood to seal it up. John
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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10-02-2016, 03:41 PM
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#12
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Montana Fan
Join Date: May 2016
Location: Massillon
Posts: 437
M.O.C. #18658
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If the floor duct is insulated and sealed but closing off the registers helps the AC then there must be an air leak between the furnace and the floor registers unless the air is just passing through the furnace from the furnace return. The furnace can leak outside combustion air into the floor duct if the furnace gasket is not sealing? I guess it is time to start pulling the basement wall covers and have a look see.
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