Volume and temperature.

Fabric bags tolerate genuinely hot gas.

Kilns, furnaces and dryers become possible.

Fabric can be chosen for chemical resistance too.

Cartridge media has narrower limits.

Heavy process plants are its natural home.

By how gently and how continuously they clean.

Pulse-jet snaps the cake off with compressed air.

It can clean while the plant runs.

Shaker and reverse-air clean gently instead.

Those usually take a compartment offline.

Continuous processes drive the pulse-jet choice.

Airflow divided by filter area.

A high ratio pushes more air through less fabric.

That works briefly and then blinds.

A low ratio buys a larger machine.

It also buys far longer bag life.

Treat it as a trade, not an efficiency.

More than most budgets allow for.

Every pulse consumes stored compressed air.

Frequency rises as bags load.

Compressed air is expensive to generate.

Ask for consumption at design condition.

Demand-based cleaning reduces it substantially.

It depends on fabric, ratio and cleaning.

Aggressive cleaning shortens life directly.

So does an over-optimistic air-to-cloth ratio.

Abrasive dust wears fabric mechanically.

Ask for expected life at the quoted duty.

Bag replacement is the major maintenance event.

More than expected, especially in height.

Bags are long and hang vertically.

Removal needs clear space above or beside.

The hopper needs discharge access below.

It is a building-scale object.

Plan the change-out route, not just the footprint.

It drops into a hopper and must be removed.

Rotary valves or screws handle continuous discharge.

Bridging in the hopper is a common problem.

Hot or hygroscopic dust makes it worse.

Disposal route affects running cost.

Design the discharge with the collector.