Incessant dust! Does anyone know of a GOOD air cleaner for about 1100 SQ ft (11,000 CUFT). or a solution for the furnace other than changing the filters - which do not get dirty that fast. The apartment gets dusty in a few days and drives me nuts. I've checked for leaks in the duct, had the ducts cleaned. Thanks

SOURCE: no air blowing through ducts

If the inside fan motor is still running but you have no air flow it could be low refrigerant charge, dirty evaporator coil, or just leaving the temperature set point to low over night when it was cooler outside, causing the evaporator to freeze up stopping the air flow. Once the evaporator coil has started to collect ice it must be completely defrosted before the problem can be corrected.
Example, It could be that your coil froze due to a dirty filter, which you have now replaced, but the evaporator coil has not had a chance to completely defrost.
I would turn off the A/C but set the fan to on for at least four hours, if you can see the drain from the unit wait until not even a drop of water is coming from it. Then turn the A/C back on and check it, it is important to leave the A/C off the full defrost time, if it is turned on even for a few minutes at a time it will never defrost.
After you restart the A/C if it cools ok for a while then does the same thing again it is probably low refrigerant charge and you should have a service company check it.

SOURCE: Too much dust

take a close up picture of the fibers

Testimonial: "I tried - the dust doesn't show up in the lousy camera in my phone. What I need is a way to reduce the dust - I con't care about the content - it hasn't killed me yet. I am going to try a test - put a temporary filter over a duct outlet and return - one thought I have is basement dust is getting into the living area from a leak in the duct work in the basement (we live on first floor. Thanks for your help."