HEPA air scrubbers are required for jobs such as asbestos, mold and lead abatement. These HEPA air scrubbers may be used for Negative Air or Positive Air applications as well.
For Heavy Dust from drywall, sanding etc. Take a look at an air scrubber with a bag filter. The bag filter can be emptied and reused several times. A heavy dust job would consume a significant cost in filters if a HEPA filter was used. A bag filter air scrubber can save money. May be used for Negative or Positive air applications as well,
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Heavy Dust Applications ( Reusable Bag Filters Save $ )
Dirty Dog Dust Collector 2,000 CFM with Filter Change Indicator
Air Rhino Bag Unit
AirRhino Upright 24x24 Bag
PREDATOR 600 Portable HEPA Air Scrubber 600 CFM 
PAS1200 HEPA-AIRE Portable HEPA Air Scrubber 900 CFM
PREDATOR 1200 Portable HEPA Air Scrubber 1200 CFM
PAS1600SHS HEPA-AIRE High Performance Portable HEPA Air Scrubber 1900 CFM
BULLDOG 2000 CFM Variable Speed BD2KLV
PAS2400 HEPA-AIRE High Performance Portable HEPA Air Scrubber 2100 CFM
PAS5000K HEPA-AIRE High Performance Portable HEPA Air Scrubber 4000 CFM