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Old 04-11-2013, 09:13 PM   #1
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Little or No air flow from ducted a/c

I have a 2005 Allegro Bus 40'. Noticed that air flow from all vents is very little. Compared to another MH for a friend. If i take off the filter plate where the blower discharge is visible air flow will blow you over. It appears the air is not getting into duct work. ANY SUGESTIONS
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Old 04-12-2013, 07:03 AM   #2
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I have a 2005 Allegro Bus 40'. Noticed that air flow from all vents is very little. Compared to another MH for a friend. If i take off the filter plate where the blower discharge is visible air flow will blow you over. It appears the air is not getting into duct work. ANY SUGESTIONS
If you have 2 AC systems. Check the main breakers to ensure they are on. If one system is working, there will be residual air flow in the other system, but it won't be full flow. This happened in our 2011 Phaeton.
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Old 04-12-2013, 07:11 AM   #3
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You might check the duct work for holes - mice - I had a similar problem and I used an inspection mirror to look down the duct system and discovered mice had made some holes in the duct. Fixed with metal tape and worked fine after
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Old 04-18-2013, 03:43 PM   #4
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Shouldn't the filters be on the intake side, not the outlet? Having the filters on the outlet will definately block airflow.
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Old 04-18-2013, 05:05 PM   #5
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Shouldn't the filters be on the intake side, not the outlet? Having the filters on the outlet will definately block airflow.
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Old 04-24-2013, 12:45 PM   #6
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OP's heatpump model is the same as mine...The Galley escutcheon plate has both the return air and a "Quick-dump" supply Diffuser, side-by-side and directly below the rooftop unit. Here's some quick items to check:

1. I would inspect this area to see if there is any supply air "bleeding-through to the return-air side" ; thereby not even getting a chance to feed the supply duct. Remove the filter assembly and see if you have a leak from the supply.

2. I've seen some forum reports of a expanded foam gasket seal dislodging and moving into the ductwork. Remove the escutcheon frame from the ceiling & do a hands-on inspection.

3.If you have excellent air flow at the dump grille; the distribution duct is the next item. I would shine a light down-the-length of duct and visually see if there is some sort of blockage. Your model has 2 rows of supply grilles. If one side is good & the other side slow? or, the entire length, fore and aft appear slow?

4. If the OP is not the original owner, the previous owner may have inserted something into the duct. Many-a-mod has confounded 2nd owners.

5. Your friend may have a very different unit than yours; but I believe the air flow in cubic feet per minute would not vary [not related to the BTUH capacity of the unit]. If he had 2 or more units running in unison, you would have noted that already.
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