Three-quarter view of a medium-efficiency multi-pocket air filter

Air Filters and Chemical Filtration

Medium-Efficiency Pocket Filter

An extended-surface pocket filter that distributes air through multiple tapered bags for low resistance and high dust capacity.

Extended Pocket Area
Stable Tapered Bags
High Dust Capacity
Galvanized Header Frame

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Product Introduction

The medium-efficiency pocket filter divides glass-fiber or synthetic media into multiple tapered pockets secured to a rigid galvanized header. Internal stitching, spacers or aerodynamic pocket geometry prevent adjacent pockets from collapsing together, allowing the full media surface to remain active. The long pockets store dust through their depth and lower the media velocity compared with a flat panel of the same face size. A sealed pocket-to-header connection prevents bypass where the flexible media enters the mounting frame.

Key Features

Multiple deep pockets create a large filtration area behind a standard modular face size.

Tapered geometry and internal stabilizers promote uniform inflation from top to bottom.

A galvanized header provides a rigid sealing surface for front- or side-access filter housings.

Sealed seams and pocket roots keep collected dust from bypassing the active media.

Customer Product Concerns

Bag filters need even pocket inflation and unobstructed downstream space to use their full area without abrasion or high pressure drop.

Adjacent pockets collapse together and leave most of the media area inactive.Tapered bags with internal stabilizers maintain separation and balanced airflow between pockets.

Long pockets rub a downstream coil or access door and wear through.The selected pocket depth is matched to the clear housing space and installed airflow direction.

Dust bypasses through poorly sealed pocket roots at the header.Continuous adhesive and mechanically secured pocket attachment close the transition into the metal frame.

Uneven inlet velocity overloads the center bags while outer pockets remain clean.Adequate upstream spacing and a uniform filter-bank face velocity distribute air across every pocket.

Typical Applications

Cleanroom HVAC preparatory filtrationCommercial and hospital air handlersPharmaceutical support-area supply airIndustrial process make-up airProtection for terminal HEPA filters

Technical Parameters

Typical construction ranges for a medium-efficiency extended-surface pocket filter are listed below.

Core Material	Glass-fiber or tear-resistant synthetic pocket media with internal stabilizing seams
Panel Thickness	25 mm nominal galvanized header-frame depth
Effective Width	287-592 mm modular face width
Maximum Length	360-635 mm pocket depth in the airflow direction
Steel Facing Thickness	0.70-1.00 mm galvanized header and pocket-retaining channels
Core Density	Approximately 30-60 kg/m³ nominal pocket-media bulk density
Thermal Conductivity	Approximately 0.035-0.045 W/(m·K) for the dry fiber medium
Surface Finish	White glass fiber or color-coded synthetic pockets with mill-galvanized header
Joint Type	Individually stitched pockets sealed and mechanically locked into a common galvanized header frame
Customization	Available based on the intended application and operating environment.

Available Options

ISO ePM10, ePM2.5 or ePM1 gradesThree to ten pockets360 mm to 635 mm pocket depthGalvanized, plastic or incinerable header

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