Dust collection

[tbyji2]

Any woodworking folks out there?

Thinking about my dust collector, and dust collectors in general. Most seem to push the air through a filter (after chip separation). What affects would be had by pulling the air through a filter instead?

Question sparked from trying to choose a cartridge filter, common ones made are pricey, but Donaldson makes some more reasonable filters with good efficiency ratings. But like most filters, they are constructed for air to flow from the outside in, vs a dust collector that is generally designed for air to flow from inside the filter out.

 

[flattop1]

Surface area would be reduced slightly .

 

[tbyji2]

Good thoughts, but if they hold up under industrial applications and engine vacuum I’d think they’d be okay.

If we assume that the pressure difference from inner to outer doesn’t structurally break down the filter, what other reasons would there be.

HVAC systems pull through instead of pushing. Sure part of it is to keep marbles from working their way to the blower, but maybe there are other reasons?

 

[flattop1]

( they are constructed for air to flow from the outside in, vs a dust collector that is generally designed for air to flow from inside the filter out. )
Steel Mesh on the inside vs outside .
Cyclonic Effect .