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Your cart is empty.Duct Collar has suburban RV furnaces and its duct outlet sizes are suitable for NT-24SP, NT-30SP, NT-34SP and NT-40 are sides 4 inches round and bottom - 10 inches x 3-1/4 inches.
Randy Baxter
September 3, 2025
fits perfectly
Iamedgeman
August 24, 2025
The doctor collars seemed to work pretty well. Tip is that you may need to bend the collar seat to make them tighter. They seemed a little loose when I first put them on the furnace. You will also need a way to clamp the doctor worked to the duct collar. We ended up using 4" a band clamps. Zip ties may work as well.
Three Dog
August 12, 2025
Had wondered if it was what I needed.BINGO fits perfect. Exact match to heater box. Flange is sturdy perhaps even better than factory installed flange.Nice smooth edge so getting ducting on was easy.
SAMUEL ARTHUR WISE
August 1, 2025
good quality, fits furnace, could be less expensive
Notabiker
July 17, 2025
I had one duct for the whole back half of the camper and that blew toward the side door so I used this and some vent pipe and an outlet grill from the auction site to add a vent pointing towards the back.
Bernard Woodard
June 12, 2025
Came in good order and was a perfect fit. Installed it with no problems at all. Spend a little time thinking about the design and the heater box. Your first idea on how it is to be installed may not be the correct way. But design is perfect.
Texjoeb
June 4, 2025
good product and a good price, used on my Atwood since the price was much lower and they worked fine.
T Tass
April 22, 2025
fully functional but had to be bend into correct shape before they could be used. they arrived bend out of shape. metal they are made from easily bends.
Jeff
April 18, 2025
Exactly what we needed! worked great and was easy to reinstall onto our trailer furnace!
Matt W.
April 15, 2025
Added ducts to an atwood furnace to help cut down its short cycling due to not enough air flow and it reaching the high temp limit too fast
Customer
April 3, 2025
The price sucks....theyre probably make for .50 a piece
Elwin Phillips
April 2, 2025
Works great with suburban furnace
Hanes
February 3, 2025
Worked
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