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Old 03-24-2016, 06:41 AM   #11
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X 2 no need for it and have had campers for over 7 years without an issue. If it was needed FR would have installed them years ago. Later RJD
FR cuts costs wherever they can, just like most production facilities. FWIW I had a 1975 Airstream that came with: furnace filter, torsion axles WITH shock absorbers, water filtration system, adjustable water pressure regulator and the list goes on. None of which are on many RV's today.

Just because a manufacturer didn't put it on there doesn't mean you don't need it! I would rather replace a filter than tear down a furnace and clean duct work due to gunk build up.

I suspect most people don't run there furnaces enough or keep their RV long enough to have problems. I have torn down a few older RV furnaces and the amount of garbage that was in the blower compartment was mind boggling, also a fire hazard.

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Old 03-24-2016, 08:21 AM   #12
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Before installing a filter on your return air to the furnace you might want to read the owners manual about restricting return air flow. There's a reason a filter isn't installed and no, it's not about cost. Does anyone read the manuals that comes with the installed RV appliances?

An RV furnace is a completely different animal than a house furnace.
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Old 03-24-2016, 08:25 AM   #13
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Oakman is correct, rv furnaces draw the air from outside, not inside.
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Old 03-24-2016, 09:53 AM   #14
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I believe only the combustion air is drawn from outside. The inside air is recirculated just like in your home
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Old 03-24-2016, 11:37 AM   #15
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Beachcamper is right. The air in this discussion is recirculated air from the inside.....but I repeat.....my 40 year experience in the heating/AC business has taught me that filtration for furnaces can be a fatal mistake.
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Old 03-24-2016, 12:06 PM   #16
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I’ve been RVing for 15 years and I’ve yet to see a filter on the RETURN air flow to an RV furnace. As Oakman said, read your owners manual for goodness sake.

I’ve been a home owner for over 40 years and I’ve yet to see a house furnace that didn’t have a filter. The owners manual for a house furnace will even tell you what type and size filter to use.
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Old 03-24-2016, 12:26 PM   #17
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ManlyMan.....X2....I fully agree with you.....like I've been saying,,,,,a house AC NEEDS filtration or you'll pay me or other repairmen lots of money to clean your coils or replace them. FURNACES DON'T HAVE COILS....I did it for 40 years, and I was good at what I did. I know what I'm talking about. One exception: If you have hairy pets,,,,very hairy that lose fur,,,,,,it wouldn't hurt to have a very light filter on the intake for big fur,,,,,but it's not necessary at all. But if you DO have one,,,,as I've said before,,,,,make darned sure that you don't forget about it, because you'll create a potentially dangerous situation.
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Old 03-24-2016, 12:27 PM   #18
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Before installing a filter on your return air to the furnace you might want to read the owners manual about restricting return air flow. There's a reason a filter isn't installed and no, it's not about cost. Does anyone read the manuals that comes with the installed RV appliances?

An RV furnace is a completely different animal than a house furnace.
I hardly doubt most folks read. Yes these furnaces are totally different than a home. I had a 1982 Winnebago that I kept for 17 Years and never a problem with furnace. BTW it's not FR cutting the cost it is the suppliers. Later RJD
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Old 03-24-2016, 02:04 PM   #19
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Oakman is correct, rv furnaces draw the air from outside, not inside.
After looking at the manual, the air IS recirculated inside the camper. Sorry about that folks.
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Old 03-24-2016, 03:22 PM   #20
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Yes I DID read the manual. The only thing is says is that it needs 80 square inches of return air space. It doesn't say jack about whether you can use a filter or not. I would much rather clean pet hair out of a filter than the freaking blower box. FWIW yes FR does build to a price point and buys less expensive things to keep the profits up and the costs down. Many of the appliances are built to specifications provided by the RV companies. They can ask for whatever they want and it will be provided at a price. Yes the appliance manufacturers build things and sell them to the RV assemblers. I have worked in a variety of industries and cost vs profits is a primary driver in just about everything.

Also I have taken apart my fair share of furnaces in houses as well as RV's and while there are some differences there are more similarities than not.

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