Three-quarter view of a compact mini-pleat medium-efficiency air filter

Air Filters and Chemical Filtration

Mini-Pleat Medium-Efficiency Filter

A slim rigid filter that packs closely spaced, hot-melt-stabilized media pleats into a compact frame for efficient fine-particle control.

Compact Mini-Pleat Pack
Hot-Melt Pleat Spacing
Low Resistance
Rigid Edge Sealing

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Product Introduction

The mini-pleat medium-efficiency filter folds fine microglass or synthetic media into closely spaced pleats separated by continuous hot-melt beads. This separator-free geometry creates substantially more active area than a conventional pleated panel without adding frame depth. The pack is bonded around its perimeter into a galvanized, plastic or extruded-aluminum frame, so air is directed through the media rather than around its edges. The compact profile suits staged cleanroom air systems where installation depth is restricted but ePM1 particle capture is required ahead of the final HEPA stage.

Key Features

Closely spaced mini-pleats provide a high media-to-face-area ratio within a shallow frame.

Continuous hot-melt beads preserve open airflow channels without corrugated metal separators.

Polyurethane perimeter sealant fixes the pack to the frame and blocks internal bypass.

A rigid upstream face and recessed media protect delicate pleat tips during routine handling.

Customer Product Concerns

Mini-pleat filters must fit restricted spaces while keeping every narrow airflow channel open and securely sealed.

A deep conventional filter cannot fit inside a shallow retrofit section.Dense mini-pleat packing delivers the required media area in a 90-150 mm compact depth.

Irregular pleat gaps create localized high velocity and early dust loading.Calibrated hot-melt beads hold repeatable channels from the upstream to downstream edge.

Unprotected pleat tips are damaged while the filter is slid into a tight track.Recessed media and an optional faceguard shield the pack from rack edges and handling contact.

Fine particles bypass where the pack meets the enclosing frame.A continuous polyurethane bond seals all four sides of the mini-pleat pack.

Typical Applications

Cleanroom make-up-air unitsIntermediate filtration before HEPA filtersHospital and laboratory ventilationPharmaceutical support-area HVACCompact air-handler filter banks

Technical Parameters

Typical construction ranges for a compact mini-pleat medium-efficiency air filter are shown below.

Core Material	Water-resistant microglass or fine synthetic media with thermoplastic hot-melt separators
Panel Thickness	90, 100 or 150 mm compact frame depth
Effective Width	287-610 mm modular face width
Maximum Length	Up to 610 mm modular face length
Steel Facing Thickness	0.40-0.60 mm optional galvanized-steel expanded-metal faceguard
Core Density	Approximately 70-120 kg/m³ nominal assembled mini-pleat pack density
Thermal Conductivity	Approximately 0.033-0.042 W/(m·K) for the dry fiber medium
Surface Finish	White filter media in a galvanized, molded-plastic or anodized-aluminum frame
Joint Type	Hot-melt-spaced mini-pleat pack continuously sealed into a rigid perimeter frame
Customization	Available based on the intended application and operating environment.

Available Options

ISO ePM1 50-80% efficiency range90 mm, 100 mm or 150 mm frame depthMicroglass or fully synthetic mediaHeader flange, box frame or perimeter gasket

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