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Old 12-05-2014, 11:33 AM   #1
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Unattached vent under sink

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The vent pictured leads into the belly cavity of the camper. The fresh water tank and intake use the same hole on the floor.

I need to heat this compartment for winter camping. I assume I can reconnect the vent to a furnace duct. Any suggestions for best method?


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Old 12-05-2014, 11:42 AM   #2
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First question: I can't tell from the pic if you have any available knockouts for additional ducts on the furnace case. If, so there are adapter to go to the 2" duct. That IMO is the best method for delivery of the air to the tanks.

If not, there are 4" to 2" tees which let you feed off one of the 4" ducts pictured.
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Old 12-05-2014, 11:46 AM   #3
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Reducer:
Venting Products / Boots & Adapters / 4" to 2" Galvanized Reducer/Expander - DW Inc.
and
http://www.dwincorp.com/products/41/...nized-Take-off

or

Venting Products / Boots & Adapters / 4" to 2" Galvanized Reducer/Expander - DW Inc.
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Old 12-05-2014, 03:38 PM   #4
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No knockouts. ... Would lowes sell similar items? Thanks



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Old 12-05-2014, 04:08 PM   #5
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I doubt it. Home ducts are larger diameter
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Old 12-05-2014, 04:15 PM   #6
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Dryer and exhaust fan vents? I'll take a look and post it.

By changing the 4" to 2", will this add stress to the furnace? If so, I can probably figure out a way to split the 4" into 2 2" vents and tie back into the system. If not, I'll just drop 1 of the 4" runs to a 2" and connect it direct to the existing pipe.

Thanks.


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Old 12-05-2014, 04:23 PM   #7
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Every furnace model has a minimum total outlet square inch spec. Two 2" ducts is less than one 4" in flow rate. If you have to add, do it with the tee.

two 2" ducts = 6.28 sq. in

one 4" duct = 12.56 sq. in.

Don't reduce the flow rate of the furnace below what the installation manual says. It will overheat.
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Old 12-05-2014, 04:32 PM   #8
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Are you sure there aren't more knockouts? Mine had 6 or 7. Look on all three sides. Mine had 2 on the back, and 3 on each side, as I recall. I added an extra run to the bedroom and just used the knockout and one of the collars listed above.

What furnace model and brand?
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Old 12-05-2014, 04:34 PM   #9
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Venting Products / Boots & Adapters / 4" Tee With 2" Outlet - DW Inc.

somehow my copy and paste didn't show the tee I was talking about. Try this.
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Old 12-06-2014, 05:21 AM   #10
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dznFog, Good job. You helped jasonsherman perfectly in my view. Now I know where to go if I have a furnace question!

David
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Old 12-06-2014, 07:25 AM   #11
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Thank you. I'm away from the camper for a few days, but will check for knockouts and furnace brand/model on Tuesday.

....lots of good info.


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Old 12-06-2014, 08:19 AM   #12
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Just as an FYi, On my unit the 2" line for the FW tank is in the same location as yours. Mine (because of extra knockouts) is connected directly to the furnace. I have a separate 2" duct for the B & G tanks and it utilizes one of the Tees above. It tees off the bedroom 4" duct under the wardrobe floor and enters the belly where my water lines come up.
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Old 12-09-2014, 10:18 AM   #13
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Here's the photo of the furnace details.

It's a suburban furnace.




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