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Old 03-01-2014, 11:48 PM   #1
1 Rivet Member
1968 26' Overlander
Eugene , Oregon
Join Date: Jun 2013
Posts: 15
Suburban NT-30SP Replacing NT-22A

Tracker Inspired me! Many thanks for posting picks and giving me a point of reference. Doing this myself certainly save some $$$.

I took the plunge and bought a new Suburban NT-30sp to replace my Nt-22a found in my 68 Overlander International. I did a few things different than Tracker, but followed his lead, and.... who knows might burn down my trailer....... so Somebody please let me know if you see anything I've done that is of concern!!!

To start, I cut out the containment box of the original NT-22A. Started cutting with tin snips, and resorted to saw-zall to remove the sides. Then cut back the bottom to the length that corresponds with the inside back edge of the bottom duct opening in the new heater.

Then I cut 3/4" plywood, hacked out slots for the rails to fit, and fastened it to the metal box.

Then wrapped the font edge with galvanized flashing I had laying around. As you can see I was liberal with some real "Duct" tape I also had lying around.

Had to get a little creative in closing the rest of the shroud opening, so I used the steel box from the NT-22A that I had just cut out with the saw-zall and used tin snips to cut a closing steel shroud that would mate up with new NT-30sp.

The final shroud matched up pretty nicely!!! First try!

Test fit and things seem to line up!!

Finished the seal between the new heater and shroud with 1/2" fire safe rope and closed the circular side vents with galvanized sheet flashing both items waiting to be used. (One of the few times in my life I've been rewarded for being a pack-rat , and will help to perpetuate this terrible habit)

The Final product almost looks professional!

I must confess that the existing vent lines thru the skin needed to be modified a tad to work with this new position, and for some damn reason the new vent cover on the outside turned out a little crooked, (not exactly vertical). It is almost like the new header box was a little skewed, but it was probably the metal shroud's position relative to skin. Either way I know it's watertight, and..... Wait for it.....


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Old 03-02-2014, 08:00 PM   #2
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1974 31' Sovereign
Ottawa , ON
Join Date: May 2008
Posts: 11,169
Images: 25
Lookin' good, Quince! And as you say, the best part is you have heat!

If you want to see how I did that exact same job, have a look at post #165 in my thread. This ink should take you right to it.

I did many things the same, but I didn't use any wood at all. I planned it so that the exhaust holes would line up with the furnace's hot-air outlet and fresh air input.

Good work!
If it's to be, it's up to me.
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