Bag filters are the second line of defense in an AHU after panel filters; they have jagged/pleated edges extending back a certain distance that increase surface area for capturing dirt that passes through panel filters.

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Unidentified Speaker — Fundamentals of HVAC - Basics of HVAC [klggop60vlM]

Evidence Quote

The second line of defense there is your panel your bag filters evil and These actually kind of these jagged edges, so the bags go back a certain distance [and] that they will change that and that changes if you imagine the surface area that it can capture

Source

Fundamentals of HVAC - Basics of HVACThe Engineering Mindset
Created: 8/13/2026, 4:57:53 AM

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