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Filters are used in:
- Vacume Cleaners
- HVAC filters
- dust masks
- smoke hoods
- Auto air filters

Air Filter Particle Size chart
National Air Filtration Association (NAFA) User's Guide
Filter Effeciency
Quick Reference Comparison of ASHRAE Std. 52.2 and Std. 52.1
A Guide to Understanding HVAC Filter Selection
Ultra-web technology

last updated 4 Mar 2008