Bag filters are in general frequently used for dust removal in industrial applications. The flow can be from the outside to the inside of the filter or the other way around, depending on the application. The particles are normally captured on the internal surface of the bag filter.
Bag filters are in general not designed for replacement when they are clogged, but some bag filters for gaseous applications like dust removal can be cleaned, for example by mechanical shaking or by backwashing with compressed air

Specifications:

The Air pre-filtration system for non-dust room, hospital, pharmaceutical factory, electronics factory, spray booth and other filtration systems which are in high need of clean air.

High efficiency, multi-layer bag filters
Over 40 sq. ft. of available filter media
Effective removal ratings at 99% efficiency
Available in micron ratings from 1 to 32um