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Old 06-02-2023, 11:54 AM   #1
Montana Fan
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Join Date: Sep 2018
Location: Mountain Home
Posts: 114
M.O.C. #22661
RV Air Flow

Looking to improve the airflow in my 2018 Montana High Country with a Dometic Blizzard AC/Heat Pump in the living area. From the interior I donít see any access with out removing ceiling panels?
Do not see the Dometic Blizzard listed on the Rv Air Flow web page?
Am I missing something or is this only accessible if I pull panels and or access from the top??
Idaho, 2017 Montana HC 380, Cummins Onan Gen,Step Above Morey steps, Progressive 50 amp surge protector
Winegards Playmaker Satellite Dish,Anderson Hitch, Solara Slide-out Toppers
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Old 06-02-2023, 01:47 PM   #2
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Join Date: May 2019
Location: Alton
Posts: 2,505
M.O.C. #24086
Do a search on Air Conditioning ducts.
Many threads on improving Airflow due to collapsed duct work.
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
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Old 06-03-2023, 08:34 AM   #3
Seasoned Camper
Join Date: Dec 2018
Location: El Cajon
Posts: 86
M.O.C. #23160
From the roof, you can remove the plastic outer cover, and the styrofoam inner cover to see the air flow path.
2019 3120RL
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Old 06-03-2023, 08:50 AM   #4
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Join Date: Mar 2019
Location: Milwaukie, OR
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M.O.C. #23668
You have the ďWhisper QuietĒ system, just as we do. There is no interior access. Itís challenging to try to improve the air flow the way you might be hoping.

On ours I removed the exterior cover as suggested. Also the foam insert as well as the fan assembly. I could then reach down into the air chamber. First thing I discovered on mine is that it was very well installed with lots of HVAC aluminum tape. I used some more tape to try to smooth out some of the angles to improve air flow but gained minimal improvement.

From the inside you can open the air return vent covers to see how the ducting looks. Many, mine included, are slightly collapsed. Using some 1 1/4Ē plastic pipe you can wedge pieces in the duct to open it back up. You should also remove every ceiling vent to check the seal from the vent to the duct to make sure all are well sealed and that the vents are not sticking up into the ducts, which reduce air flow. Make sure they are flush to the duct floor. Get a boroscope to check all of the ducts to make sure they are clear. Mine we all nicely open (except the return ducts as I stated)

All of that is about all you can do on our systems. Do you have a 2nd AC in the bedroom? Mine didnít. Once I had one installed, and having done the other things I mentioned above, we have greatly improved air flow and cooling. With both ACís running we remain comfortable in hot weather.
Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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