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Old 02-18-2016, 11:10 AM   #1
Join Date: Oct 2011
Posts: 40
Furnace filter on 2011 Allegro?


We have a 2011 Allegro 32CA that we are getting ready for camping for 2016!

I have washed all of the ceiling return air filters for the A/C's but I would also like to clean or replace the filter for the furnace. Is there one and Where can I find it?


Howard Janin

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Old 02-18-2016, 12:06 PM   #2
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Most all RV furnaces don't have a filter because it might restrict air flow. You could check at the return grill in your RV, but I don't think you'll find anything. If you try to install a filter, the reduced air flow might cause the furnace to fail to work because there's a 'sail switch' in the furnace that won't trigger the furnace if air flow isn't strong enough to push it closed.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 02-18-2016, 03:05 PM   #3
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no filters on furnace
2018 Allegro Bus 37AP
2014 Phaeton 40 QBH (sold)
2018 Jeep Recon
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Old 02-18-2016, 03:58 PM   #4
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No return air flow because it can restrict return air to furnace which can cause the heat exchanger to overheat........if overheated the high temp limit switch will trip furnace.

Also can cause issues trying to light off furnace due to lack of proper air flow.

RV Furnaces are marginal on air flow to begin with and doesn't take a lot to upset the required air flow
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ace, furnace

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