I could pay you a dime to do mine!!!

When I did my A/C rebuild last year, I was pretty sure that everything was fairly clean. However, I did not pull apart the HVAC system. Maybe I can run vacuum hose in there if I find a good dash and do the swap.

I have a piece of wood wedged in my blower compartment to keep the fresh air flap 100% closed. I did that to maximize A/C efficiency but I can see the other benefits. Keep us posted on what kind of filter setup you design.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge