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Old 11-05-2014, 11:26 AM   #29
Join Date: Oct 2014
Posts: 40
I did some research on this type of furnace. If you put a filter on it and it creates to much restriction it will not allow the sail switch to activate the main control board. The limit switch is a back up to the sail switch in the same circuit in case of over heating, witch could be caused by a defective gas regulator or air flow. So if you put a filter that was to restrictive for the furnace it will not allow the burners to light, a dirty filter will have the same effect on a furnace that is recommended to have a filter. Basically if you put a filter on your rv furnace and that is to restrictive it won't hurt it, it just won't run. It needs at least 75% of it rated air flow to activate the sail switch , protecting it self from damage. Hope this helps

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Old 11-05-2014, 05:27 PM   #30
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I'm like you 71camaro...I put filters on nearly everything that moves air. I mounted a low restriction filter on my converter...it gets really loaded after 60 days AND I mounted a fan for the compartment.

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Old 11-06-2014, 05:43 PM   #31
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I buy and use Filtrete sheet-type filter material and make/cut mine to fit the return air grill, works very well. Also you may buy 2"X10" filters that fit under your heat registers, made specifically for this application; an added result is, these filters prevent dirt and stuff from falling into the heat duct-work.
Suburban might not like it, but they worked great in our 5er for 8 years. I now use them in the MH LP furnace registers. My basement air came with a 16"X20" pleated filter installed, which is changed monthly during summer months.

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