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Old 03-21-2016, 08:13 PM   #1
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Cool Add Furnace Air Filter

After learning there is NO air filter in my 2015 Prism's furnace system, I decided to add a filter myself by attaching one directly behind the furnace air return louver assembly. This assembly is directly below the propane oven.

I cut the filter from a stock 12" X 24" X 1" home air filter to match the Prism's air louver assembly.

The pics below illustrate how I did this.

https://www.dropbox.com/s/abft1x7q7t...moved.jpg?dl=0

https://www.dropbox.com/s/e5v96epmwi...ilter.jpg?dl=0

https://www.dropbox.com/s/c87pyr8pbj...tView.jpg?dl=0

https://www.dropbox.com/s/57x7bo8fx4...stall.jpg?dl=0

Has anyone else installed some kind of aftermarket or DIY furnace air filter?
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Old 03-21-2016, 09:58 PM   #2
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Add Furnace Air Filter

I added a filter on our Freelander.

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Some have voiced concern about restricting air flow. However, I have not had any problems. This might be due to there being about a 1/2" gap at the top over the louvre. My main concern was keeping pet hair from getting to the unit. It seems to have done that very well.

I made the channel out of aluminum angle from HD. The filter just slips in and out from the top. Getting the louvre out is the hard part.
I also put a thin strip of foam under the louvre at the floor to keep things from getting under that way.
Paul
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Old 03-21-2016, 09:59 PM   #3
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Nope, but now you have me thinking....

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Old 03-22-2016, 03:09 AM   #4
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I like it. Plan to do something similar. Right now I have a piece of insect screen attached to the back for catching pet hair

Love the drawer retainer.. I also have a very similar set up. Wonder if forest river will be using string/bungee cord for all the drawer clasps
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Old 03-22-2016, 03:51 PM   #5
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WOW you made a very nice setup, i have had 3 coaches with the same type of setup, with a large metal cover over the heat return, and with having dogs and a bird that travel with us, i have always just used a universal filter and cut it to fit, and it has always keep the return/ heater clean from all the dirt and dust.
I have never had any issue with doing this (air restriction) and you also get a side benefit as it makes the heater QUIETER as the filet blocks some of the noise of the heater it self.
Hope this helps and Happy camping
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Old 03-22-2016, 06:19 PM   #6
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Dennise,,,,,I've been in the heating/AC business for 40 + years,,,,,the reason for a filter on ac's is to keep crap off the evaporator coils,,,,killing your efficiency. There're no coils on the furnace. Putting a filter on the intake of the furnaces serves absolutely no good purpose. If you do insist on doing it,,,,,make DARNED SURE that it stays clean.... otherwise your hi-temp limit switches on the furnace with try to keep the furnace from overheating. I don't recomment doing it.....there COULD be a serious safety issue.
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Old 03-22-2016, 06:32 PM   #7
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Did anyone consider using this? No framework needed. Just cut to fit.
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Old 03-22-2016, 11:36 PM   #8
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Quote:
Originally Posted by Grampa Jim View Post
Dennise,,,,,I've been in the heating/AC business for 40 + years,,,,,the reason for a filter on ac's is to keep crap off the evaporator coils,,,,killing your efficiency. There're no coils on the furnace. Putting a filter on the intake of the furnaces serves absolutely no good purpose. If you do insist on doing it,,,,,make DARNED SURE that it stays clean.... otherwise your hi-temp limit switches on the furnace with try to keep the furnace from overheating. I don't recomment doing it.....there COULD be a serious safety issue.
I'm not a 40+ year HVAC guy, but every Forced Air Unit (FAU) I've ever owned has had a filter on the return air duct to keep guck (oily dust) off of the squirrel cage fan blades and help remove dust and allergens from the circulating air. I understand how a dirty filter could cause the High Temp limit switch to trip, but if I had animals in my TT, I would be cleaning it regularly. I change my home FAU filter quarterly to keep allergens from setting off my sinuses, and would do the same in my TT if I had a filter in it.
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Old 03-23-2016, 09:20 PM   #9
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Quote:
Originally Posted by HikerBob View Post
I'm not a 40+ year HVAC guy, but every Forced Air Unit (FAU) I've ever owned has had a filter on the return air duct to keep guck (oily dust) off of the squirrel cage fan blades and help remove dust and allergens from the circulating air. I understand how a dirty filter could cause the High Temp limit switch to trip, but if I had animals in my TT, I would be cleaning it regularly. I change my home FAU filter quarterly to keep allergens from setting off my sinuses, and would do the same in my TT if I had a filter in it.
Agreed.... I have owned quite few houses in the past 40 years, only two didn't have filters. One had a radiator boiler system, the other had a gravity furnace in the hallway.

Every force air system I have ever had, came with some sort of filter on the air return. I WILL be putting one in the camper to keep the dog hair down to a manageable level.

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Old 03-23-2016, 09:25 PM   #10
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Originally Posted by Grampa Jim View Post
Dennise,,,,,I've been in the heating/AC business for 40 + years,,,,,the reason for a filter on ac's is to keep crap off the evaporator coils,,,,killing your efficiency. There're no coils on the furnace. Putting a filter on the intake of the furnaces serves absolutely no good purpose. If you do insist on doing it,,,,,make DARNED SURE that it stays clean.... otherwise your hi-temp limit switches on the furnace with try to keep the furnace from overheating. I don't recomment doing it.....there COULD be a serious safety issue.
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
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