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Old 11-04-2014, 08:20 AM   #15
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Filters are typically installed on RV furnaces only when the air return intake is in the floor where dust tends to roll n and settle. Most are not and the air is sucked directly into the side of the furnace housing, in an area that typically does not have a lot of dust. But if you see dust bunnies in that area, maybe a filter would be a plus.

RV furnaces move a relatively small volume of air compared to a house furnace and [in most cases] don't get used 24/7/365, so seldom have dust problems internally or at the intake. They may, however, build up dust in the outlet tubing. If you observe that problem, consider adding a filter.
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Old 11-04-2014, 08:47 AM   #16
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I'm new to rving and would like to no why they aren't not recommended?
71camaro
Because the furnace manufacturer "says so" is a good enough reason for me.
Read your Furnace Owner's Manual.

Who knows what is best for your furnace than the manufacturer??

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Old 11-04-2014, 09:03 AM   #17
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The reason the a/c units have filters is the spacing between the fins in the coil where the heat is transferred are very close together and can catch dirt and particles in the air and clog the coil. The furnaces have large spaces between the heat exchanger and unless a large chunk of something get thru the return grill will not plug up with common dust and dirt.
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Old 11-04-2014, 09:24 AM   #18
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71camaro
Because the furnace manufacturer "says so" is a good enough reason for me.
Read your Furnace Owner's Manual.

Who knows what is best for your furnace than the manufacturer??

Mel
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WOW! I guess I just can't help some people. Just so you know the manufactures are in the business to sell equipment. Your furnace will out last your warranty without a filter.
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Old 11-04-2014, 09:47 AM   #19
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I'm a HVAC contractor, not very familiar with your furnace. I would recommend all furnaces with a blower have a filter
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71camaro
Read your Furnace Owner's Manual.
Who knows what is best for your furnace than the manufacturer??
Mel
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WOW! I guess I just can't help some people.
71camaro
IMO advising owners to add a furnace filter when the furnace maker DOES NOT RECOMMEND a filter "helps" no one.
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Old 11-04-2014, 10:53 AM   #20
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"We recommend an annual inspection by a qualified service technician" Mel do you do this every year? "Also, you as the owner/user should inspect the furnace monthly during the heating season" My point is that the manufacture recommends many things, Not all of them are for your benefit. I base my recommendations on 35 years experience of taking care of all types or HVAC equipment. I'm the guy in the middle of a blizzard at 11 pm you call to repair your furnace, not the manufacture. In my business "says so" without explanation isn't a good answer.
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Old 11-04-2014, 11:15 AM   #21
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My point is that the manufacture recommends many things, Not all of them are for your benefit. I base my recommendations on 35 years experience of taking care of all types or HVAC equipment. I'm the guy in the middle of a blizzard at 11 pm you call to repair your furnace, not the manufacture. In my business "says so" without explanation isn't a good answer.
71camaro
Understood

BTW, I'm the guy I will call to repair my 18 year old unfiltered RV furnace at 11 pm in the middle of a blizzard, (if it ever needs fixing).

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Old 11-04-2014, 03:43 PM   #22
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I didn't know I opened up such a can of worms with this topic, maybe I should have asked about tires or oil.
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Old 11-05-2014, 04:12 AM   #23
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I didn't know I opened up such a can of worms with this topic, maybe I should have asked about tires or oil.
Don't worry about it.
This is to be expected when every one has an opinion and some can't accept anyone not in agreeance. This is allowable as long as it does not become personal and the debate remains civil. As the old saying is, "Take it with a grain of salt".
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Old 11-05-2014, 07:45 AM   #24
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My apologies for getting off the question, if I can help you in any way let me know.
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Old 11-05-2014, 07:57 AM   #25
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I didn't know I opened up such a can of worms with this topic, maybe I should have asked about tires or oil.

Hope no one took this wrong, I was kidding around, tires and oil subject is notorious for being controversial. The great thing about this site I believe is everyone is truly trying to help each other. We all have different levels of knowledge, and experience, and we all have opinions.
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Old 11-05-2014, 09:05 AM   #26
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Mel,

I agree with you... The manufactures recommendations is driven mostly by the liability of thief products and the cost of litigation, not necessarily by what's best for the longevity of the unit. They must believe no filter is the safest. I would rather have safety and piece of mind.

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Old 11-05-2014, 09:28 AM   #27
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Mel,
I agree with you... The manufactures recommendations is driven mostly by the liability of thief products and the cost of litigation, not necessarily by what's best for the longevity of the unit. They must believe no filter is the safest. I would rather have safety and piece of mind.
Randy W
Maximum airflow through the furnace, to prevent the heat exchanger from over heating, is the primary reason no filters are rec-commended. Sail switch operation, hopefully would shut the furnace down, in the case of a major restriction. But because any furnaces I've worked on have no sensors for exchanger temperature, best to keep all the air possible flowing through the unit. JMHO, of course.
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Old 11-05-2014, 10:19 AM   #28
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All UL listed forced air furnaces have a high temperature limit. Incase of duct blockage or motor failure. Just trying to help not start a argument.
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