What kinds of dust filter bags are used for boilers?

What kinds of dust filter bags are used for boilers?

Timber boiler: nomex, glass, ryton(pps) felt dust filter bags

Bunker Coil boiler: nomex(aramid), glass, ryton(pps) dust filter bags

Coal boiler: nomex(aramid), ryton(pps), mixture of ptfe and glass, ptfe dust filter bags.

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