We should all filter the air we breathe, would you run your furnace at home without a filter? I think not.
The Pleated air filter does not restrict the air enough to cause any problem. They design them for air filtering keeping in mind restrictive values.
Have you ever seen a ray of sunshine in the RV and all the dust and particles floating around it it? That is the air we take in our lungs...yuck!
The air filter return in my 3400RL is 19-1/2" by 6-/8"
Just make a couple of sheet-metal L-shaped tabs on each side and the filter will nest there quite comfortably, protecting your lungs...and keeping much of the dust off of things.
How to:
http://tinyurl.com/FilterMe
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