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01-13-2015, 07:18 AM
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#1
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Senior Member
Join Date: Jul 2014
Location: Nevada
Posts: 2,695
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Underfloor Heater Ducting
During our current travels in chilly snowbird country, I've been thinking about previous posts I've read concerning low flow from the floor ducts and excessive, connecting ducting to the registers.
Our SRX seems to be generating more than adequate heat, and I was thinking that perhaps Keystone ran extra ducting on purpose to provide more heat to the belly area, i.e. more surface area for radiant heating. Having said that, I have no idea what our underfloor ducting looks like...and I probably won't unless it is absolutely necessary to breach that area.
Whadda ya think?
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Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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01-13-2015, 07:46 AM
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#2
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Senior Member
Join Date: Feb 2013
Location: Lacey, WA
Posts: 503
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I agree. I'm not going in there unless I have to.... then I will sort out the plumbing.
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Lee & Christie
1970 F250 Highboy 4x4
2013 Cougar 21RBSWE
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01-13-2015, 07:59 AM
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#3
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,326
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IMO: extra ducting=extra $, and I haven't found an RV maker yet that isn't trying to cut costs.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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01-13-2015, 09:35 AM
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#4
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Senior Member
Join Date: May 2013
Location: Reedsport
Posts: 322
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D-185,
I agree with you. If it ain't broke don't fix it!
I did have low flow issues with the bedroom and did drop the belly and was able to correct the issue (extra ducting doing a 360 prior to reaching duct). But if you have no issues that you know of or suspect I'd leave it alone unless of course you enjoy rolling around on your back (a lot), punching a hole in your fresh water tank (don't ask ). Although while I was there I put in some foil backed bubble type insulation. Don't know if it really did any good but I felt better for doing it .
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2007 Keystone Cougar 243RKS
2019 Ford F150 S/Crew ECOBoost
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01-13-2015, 10:30 AM
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#5
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Site Team
Join Date: Feb 2014
Location: W. Texas
Posts: 17,676
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I agree with the other posts.....if it's doing the job, leave it alone. The duct that is furthest from the furnace on our trailer puts out less air than the one closest in the bathroom....which will run you out of the place. Overall it does an acceptable job throughout the trailer so I'm in no hurry to pull of the underbelly.....especially this time of year
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01-13-2015, 08:23 PM
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#6
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Senior Member
Join Date: Jul 2014
Location: Nevada
Posts: 2,695
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Quote:
Originally Posted by chuckster57
IMO: extra ducting=extra $, and I haven't found an RV maker yet that isn't trying to cut costs.
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That did occur to me, but why then is there extra ducting as reported by some on this forum?
__________________
Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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01-13-2015, 08:38 PM
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#7
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,326
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I don't have that answer, but I'm thinking it has something to do with making a run with the "end of the roll" and if it were cut, the left over would be too short to do anything with. Sounds like just the opposite of what I was saying before, but trash costs money to haul away and a bunch of ends adds up quick. Leftover lumber and wall paneling are made into shipping containers so that waste is kept to a minimum.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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01-14-2015, 02:14 AM
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#8
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Senior Member
Join Date: Jan 2014
Posts: 487
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Quote:
Originally Posted by chuckster57
I don't have that answer, but I'm thinking it has something to do with making a run with the "end of the roll" and if it were cut, the left over would be too short to do anything with. Sounds like just the opposite of what I was saying before, but trash costs money to haul away and a bunch of ends adds up quick. Leftover lumber and wall paneling are made into shipping containers so that waste is kept to a minimum.
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They're probably pre-cut to a few different lengths and you grab the one that will reach. If the trailer is four feet shorter than the one that the tube fits perfectly, just coil up the excess. Trimming takes extra time.
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Pilot for fun, Computer geek for a living, and happy 5er owner who wants more time to go play in the camper!
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01-14-2015, 04:09 AM
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#9
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Senior Member
Join Date: Aug 2012
Location: Waco, Tx
Posts: 5,457
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Quote:
Originally Posted by chuckster57
I don't have that answer, but I'm thinking it has something to do with making a run with the "end of the roll" and if it were cut, the left over would be too short to do anything with. Sounds like just the opposite of what I was saying before, but trash costs money to haul away and a bunch of ends adds up quick. Leftover lumber and wall paneling are made into shipping containers so that waste is kept to a minimum.
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Not all of it.. I found enough saw dust and chunks of wood to build a couple of shipping containers in the heat run of my 333MKS..
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2015 Ford F350 DRW 6.7 Diesel XL
2020 Avalanche 313 RS
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01-14-2015, 07:59 AM
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#10
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Senior Member
Join Date: Jul 2014
Location: Nevada
Posts: 2,695
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Quote:
Originally Posted by chuckster57
I don't have that answer, but I'm thinking it has something to do with making a run with the "end of the roll" and if it were cut, the left over would be too short to do anything with. Sounds like just the opposite of what I was saying before, but trash costs money to haul away and a bunch of ends adds up quick. Leftover lumber and wall paneling are made into shipping containers so that waste is kept to a minimum.
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Well, if I do have extra ducting in my SRX, then I'm grateful for it after the chilly weather we've been experiencing in west and south Texas. The heater works well and the floor is warm. Tucson later today!
__________________
Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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01-14-2015, 12:54 PM
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#11
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Senior Member
Join Date: Jan 2013
Location: Winterset, Ia
Posts: 280
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Question on my Alpine in the bathroom floor register there is alot of airflow. this is a short run from furnace could i put a adjustable diffuser in and not cause any problems with furnace overheating overall air flow is acceptable throughout but thought it might help balance it out. i have already straigtened duct work out.
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01-14-2015, 01:15 PM
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#12
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,326
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You sure can, won't hurt a thing. Air will take the path of least resistance, so adding resistance in the bath will cause the air to exit somewhere else.
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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01-14-2015, 01:32 PM
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#13
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Senior Member
Join Date: Jan 2013
Location: Winterset, Ia
Posts: 280
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Thanks
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01-22-2015, 07:22 PM
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#14
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Junior Member
Join Date: Dec 2014
Location: charleston, SC
Posts: 5
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the ducting goes past the end registers and does provide radiant heat to the enclosed underbelly. it is designed that way. each register is checked for air flow at the factory and is quite adequate. A problem exists if a register is having low flow.
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10-20-2015, 12:26 PM
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#15
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Member
Join Date: Sep 2013
Location: las vegas nv
Posts: 72
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I have a fuzion 342 and this past weekend I was checking out my heater and I have no air flow in the garage vent. Is the only way to check the connection is taking the underbelly off? I looked at the furnace and I am guessing there is duct work attached to the bottom as well as what is visible on the back of the furnace? All the other floor vents have good airflow. Is there a diagram that shows heat duct work lay out?
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2006 Dodge Ram 3500 a little of that a little of this. 2005 "POS" Forest River All American Sport. Soon to be a Fuzion fz331
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10-20-2015, 12:40 PM
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#16
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Site Team
Join Date: Mar 2009
Location: Fraser Valley BC Canada
Posts: 7,015
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If you can, just "peel back" enough of the coroplast/underbelly off so you can see the ductwork. Check for kinks or loose connections and fix if necessary. Sorry, there are no diagrams showing the layout of the ductwork, plumbing or electrical layout.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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10-20-2015, 01:15 PM
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#17
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Member
Join Date: Sep 2013
Location: las vegas nv
Posts: 72
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Sounds good thanks as some of these other posts mentioned I may just use a pro pain space heater. But I will definitely check the duct work first. Thanks
Sent from my iPhone using Tapatalk
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2006 Dodge Ram 3500 a little of that a little of this. 2005 "POS" Forest River All American Sport. Soon to be a Fuzion fz331
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10-20-2015, 01:38 PM
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#18
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Site Team
Join Date: Jul 2014
Location: Modesto
Posts: 20,326
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Do not use a propane space heater indoors. It consumes oxygen for the flame and produces carbon monoxide.
That's the main reason your furnace is vented to the outside and the refer cabinet is sealed
__________________
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.
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10-20-2015, 04:09 PM
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#19
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Senior Member
Join Date: Apr 2011
Location: Arrey,
Posts: 2,368
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Desert185, Howdy;
Here's a wee bit of 'lite' reading that can help you out if you truly would like
to tighten up your heating system and square away your under belly area,
Get comfortable, and happy reading and learning ...
http://www.keystonerv.org/forums/showthread.php?t=19807
hankaye
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Striving for a less complicated life since 1949 ...
Home: 2008 Cougar 278 RKS
T.V.: 2004 F-250 4X4, Level III BulletProofed , Detroit Tru-Track Differential (915A550)
Dog: 2006 Border Collie (Rascal) aka Maximum fur dispersal unit. (08/04/2006 - 12/16/2017) RIP.
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