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Author Topic: Adding Heating Vents  (Read 525 times)

glen54737

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Adding Heating Vents
« on: January 03, 2018, 08:29:53 PM »
My new motorhome is 37ft and has only 3 heating vents 1 under the bed in the back, 1 in the bathroom and 1 between the driver and passenger seats. The 1 in the bedroom blows most of the hot air so it's really hot there but the thermostat is near the front seats.

I think there should be at least 1 more register in the middle.
Does anyone know where the duct runs ?
I think I can cut into the duct if it's right under the floor but don't want to miss.

Thor Miramar 35.2 2018 my.
 
2018 Thor Miramar 35.2
2015 F-350 CC short box 6.7l 3.55 axle
2015 Alpine 3510RE-sold

Glen,Nene
Mickey & Jayco (yorkies)

Ernie Ekberg

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Re: Adding Heating Vents
« Reply #1 on: January 04, 2018, 05:55:08 AM »
Are your registers in a line? I would close off the bedroom vent, first.
Ernie Ekberg, Weatherford, Tx
Prevost Liberty Classic XL
www.ernieekbergflooring.net

Oldgator73

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Re: Adding Heating Vents
« Reply #2 on: January 04, 2018, 07:29:48 AM »
You have to be careful when adding registers to a heating/cooling system. By adding a register in the middle you could very well reduce the airflow from the registers after the added one.
Retired Air Force
2016 Winnie Drop
2016 Nissan Frontier

kdbgoat

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Re: Adding Heating Vents
« Reply #3 on: January 04, 2018, 07:57:58 AM »
If one looks at an installation manual for their furnace, one will find very specific instructions for ductwork installation on the plenum.
I know you believe you understand what you think I said,
But I am not sure you realize what you heard is not what I meant


2016 Leprechaun 319DS

Gary RV_Wizard

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Re: Adding Heating Vents
« Reply #4 on: January 04, 2018, 09:11:50 AM »
I have no idea where your ducting runs, but adding an outlet in the middle won't help get heat to the front. It sounds as though your main problem is that most of the hot air escapes via the bedroom vent. Reducing the flow there will force more toward the front outlets. 

Some outlets are adjustable but the cheaper ones are not. If you cannot partially close that bedroom vent, either partially cover it (from the rear side) or replace it with an adjustable type.

Ducting may be either flexible tubing or rectangular metal ducting. I don't know which type Thor uses in your model of coach.
Gary
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Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL

glen54737

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Re: Adding Heating Vents
« Reply #5 on: January 04, 2018, 07:05:07 PM »
If one looks at an installation manual for their furnace, one will find very specific instructions for ductwork installation on the plenum.
That may be the root cause.
So far I've been less than impressed with the build quality. That's why I think that there should have been another vent.

Gary- The bedroom vent is one of those round ones on the end of a flex duct no adjustment. I'll look into replacing it when I can.

Thanks for the suggestions
2018 Thor Miramar 35.2
2015 F-350 CC short box 6.7l 3.55 axle
2015 Alpine 3510RE-sold

Glen,Nene
Mickey & Jayco (yorkies)

ALLOY

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Re: Adding Heating Vents
« Reply #6 on: January 04, 2018, 11:35:25 PM »
Don't know about Attwood but Suburban require a min of four 4" registers.

Restricting the airflow reduces the efficiency of the furnace from bad to horrible.

Before adding you'll need to find out if there is a plenum running the length of the RV or 4" flexible ducting was used.
35' 5th