RV furnaces do not use a filter.
A filter would restrict the return air flow, fan can not suck enough air thru a filter and furnace would overheat due to lack of return air flow.
No filters on RV furnaces
Which is a good thing sorta......5 years is a long time not to change a filter
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31