Three-quarter view of a wire-backed pleated HVAC pre-filter

Air Filters and Chemical Filtration

Pleated Pre-Filter

A wire-supported pleated panel that increases coarse-media area and dust capacity without increasing the face size of the filter track.

Expanded Media Area
Wire-Stabilized Pleats
Moisture-Resistant Frame
Standard Filter-Track Sizes

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Product Introduction

The pleated pre-filter forms cotton-synthetic or fully synthetic media into evenly spaced radial pleats over a corrosion-resistant downstream wire grid. The pleat geometry adds media area and dust storage within a familiar panel footprint. Adhesive bonds between the media, support grid and enclosing frame stop pleats from collapsing or fluttering at high airflow. Standard 25, 50 and 100 mm nominal depths allow the filter to replace flat throwaway panels while providing a longer service interval.

Key Features

Radial pleats place more active media in the same frontal area than a flat pad.

A corrosion-resistant expanded-wire backing prevents pleat collapse and media oscillation.

Diagonal frame members protect pleat geometry during transport and filter changes.

Multiple nominal depths balance available track space, resistance and dust-holding capacity.

Customer Product Concerns

Pleated prefilters perform best when pleat spacing remains open and the panel seals evenly against the filter rack.

Flat pads require replacement before their full face area has stored much dust.The pleated pack multiplies usable media area and distributes deposited particles across deeper folds.

Closely packed pleats touch each other and create high-resistance dead zones.Controlled radial spacing keeps adjacent pleat walls separated throughout the panel.

Fan starts pull unsupported media downstream and permanently distort the pack.A bonded expanded-wire grid stabilizes the media on the air-exit side.

Humid intake air softens ordinary frames and opens bypass gaps at the corners.A high wet-strength frame with bonded mitered corners retains shape in normal HVAC humidity.

Typical Applications

Air-handler prefilter banksRooftop and packaged HVAC unitsFan-coil return-air cabinetsProtection for medium-efficiency bag filtersCommercial and light-process ventilation

Technical Parameters

Typical construction ranges for a standard-capacity pleated HVAC pre-filter are shown below.

Core Material	Cotton-synthetic blend or 100% synthetic mechanical filter media on expanded-wire backing
Panel Thickness	22, 45 or 95 mm actual depth for nominal 25, 50 or 100 mm filters
Effective Width	289-610 mm standard face width
Maximum Length	Up to 610 mm standard face length
Steel Facing Thickness	0.30-0.45 mm corrosion-resistant expanded-wire media support
Core Density	Approximately 30-60 kg/m³ nominal pleated-media bulk density
Thermal Conductivity	Approximately 0.035-0.045 W/(m·K) for dry cotton-synthetic media
Surface Finish	White synthetic media with galvanized or corrosion-resistant support grid
Joint Type	Pleated media and wire grid bonded into a moisture-resistant diagonal-support panel frame
Customization	Available based on the intended application and operating environment.

Available Options

ISO Coarse and MERV 8 grades22 mm, 45 mm or 95 mm actual frame depthMoisture-resistant board, ABS or galvanized-steel frameStandard- or high-capacity radial pleat count

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