I upgraded my filter on my Harbor Freight dust collector, makes a huge difference in the air quality and air movement. I was reluctant because the filter costs more than the actual
Workshop Dust Collection 2.0: Modding a Harbor Freight 2 HP Dust Collector – Nick Momrik
CENTRAL MACHINERY 70 gallon 2 HP Heavy Duty High Flow High Capacity Dust Collector for $179.99 – Harbor Freight Coupons