You know, It's odd that I've been using thin filters under our floor registers for 14 years without any negative effects.
The work both directions, they catch dirt that falls into the register and filter heated air emitted from them.
The important point is, change them frequently when in use.
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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