HVAC Pocket Bag Filters

Pocket-style, extended-surface filters designed for commercial and industrial HVAC systems. Media options include synthetic (standard and extra-tough) and fiberglass. All variants focus on high dust-holding capacity, even pocket loading, and controlled pressure drop for energy-efficient operation.

Quick Compare

Family Typical Efficiency (examples) Common Depths Pocket Counts Construction Highlights Typical Final Resistance
Synthetic MERV 12–15 (by build) 12", 15", 22", 29", 36" (varies) 6 / 8 / 10 Ultrasonic-welded or stitched pockets; non-shedding media; moisture resistant 1.0" w.g.
Synthetic (Extra-Tough) MERV 11–15 (by build) ~19", 26" (representative) 6 / 8 / 10 Heavy-duty media; reinforced pocket construction; adhesive over stitch lines 1.0" w.g.
Fiberglass MERV 11–15 (by build) 22", 30", 36" (common) 6 / 8 / 10 Lofted micro-glass media; stitched pockets; bonded backing 1.0" w.g.

Synthetic Pocket Filters (Standard)

Synthetic, depth-loading media with pocket geometries that promote even airflow and uniform loading. Available in multiple pocket counts and depths. Non-shedding media supports cleaner downstream air and helps protect coils and secondary filters.

Key Features

  • Ultrasonic-welded pocket options to remove stitch holes and reduce leakage pathways
  • Ribbon or band pocket separators to stabilize pockets and improve loading
  • Moisture-resistant media; does not support microbial growth
  • Typical recommended final resistance: 1.0" w.g.

Representative Performance (24 × 24)

Depth Pocket Count MERV 12 — Initial @ 500 fpm MERV 13 — Initial @ 500 fpm MERV 15 — Initial @ 500 fpm Final
12"6 / 80.45 / 0.390.62 / 0.540.98 / 0.801.0" w.g.
15"6 / 80.42 / 0.360.52 / 0.420.72 / 0.581.0" w.g.
22"6 / 80.33 / 0.290.35 / 0.320.49 / 0.431.0" w.g.
29"6 / 80.31 / 0.260.34 / 0.290.41 / 0.331.0" w.g.
36"6 / 80.37 / 0.280.41 / 0.340.45 / 0.361.0" w.g.

Synthetic Pocket Filters — Extra-Tough

Heavy-duty synthetic construction for demanding or high-abuse installations. Reinforced pocket seams, adhesive over stitch lines, and robust media help maintain integrity through the filter’s life.

Key Features

  • Reinforced pockets for turbulent air streams and frequent change-outs
  • Moisture and humidity tolerant; non-shedding media
  • Typical recommended final resistance: 1.0" w.g.

Representative Performance (24 × 24)

Depth Pocket Count MERV 11 — Initial @ 500 fpm MERV 15 — Initial @ 500 fpm Final
~19"8 / 100.25 / 0.200.35 / 0.301.0" w.g.
~26"6 / 8 / 100.21 / 0.17 / 0.230.30 / 0.23 / 0.391.0" w.g.

Fiberglass Pocket Filters

Lofted micro-glass media with stitched pocket construction and bonded backing. Designed for low initial resistance and long service life, with wide availability in pocket counts and depths.

Key Features

  • Fine micro-glass media for high efficiency
  • Stitched pockets with adhesive-sealed seams
  • Typical recommended final resistance: 1.0" w.g.

Representative Performance (24 × 24)

Depth MERV 11 — Initial @ 500 fpm MERV 13 — Initial @ 500 fpm MERV 15 — Initial @ 500 fpm Final
22" (6/8/10 pkts)0.45 / 0.34 / 0.270.63 / 0.47 / 0.370.80 / 0.60 / 0.481.0" w.g.
30" (6/8/10 pkts)0.35 / 0.26 / 0.210.47 / 0.35 / 0.280.60 / 0.45 / 0.361.0" w.g.
36" (6/8 pkts)0.29 / 0.220.40 / 0.300.51 / 0.381.0" w.g.

General Notes & Guidance

  • Final Resistance: Unless otherwise specified, size for 1.0" w.g. for pocket filters (follow equipment limits and local practice).
  • Face Velocity: Data shown is representative at ~500 fpm; verify exact ratings per size and build.
  • Pocket Count: More pockets generally reduce initial resistance and increase dust-holding capacity at a given face velocity.
  • Sizing: Confirm actual sizes (W × H × D) vs. nominal for proper fit.
  • Media & Treatment: Some synthetic builds include ultrasonic welding, pocket bands, non-migrating tackifiers, or antimicrobial options.

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