Cleanroom Equipment Spare Parts

FFU HEPA Filter

A compact mini-pleat final filter that restores high-efficiency particle filtration in an existing cleanroom fan filter unit.

Dense Mini-Pleat Media
Low-Profile FFU Frame
Sealed Perimeter Pack
Matched Gasket Interface

Request a Quote Browse Products

Product Introduction

The FFU HEPA filter is the final air-cleaning element installed beneath the fan section of a fan filter unit. Fine glass-fiber media is formed into closely spaced mini-pleats and stabilized with hot-melt separators to provide a large filtration area within a shallow frame. Perimeter potting prevents bypass between the media pack and aluminum frame, while a compression gasket seals the filter against its supporting surface. Replacement size, efficiency class, pressure drop, gasket side and airflow direction must match the original FFU design.

Key Features

Mini-pleat construction provides high media area within a shallow FFU profile.

Continuous perimeter potting closes the leakage path between media and frame.

A fitted compression gasket seals the filter to the FFU housing or ceiling interface.

Protective face grids reduce accidental pleat damage during handling and installation.

Customer Product Concerns

A replacement HEPA panel must fit the FFU precisely while preserving airflow and eliminating bypass around the media pack.

A frame with incorrect dimensions leaves gaps or cannot enter the FFU housing.Face size, depth and corner tolerances are matched to the original filter envelope.

An unsuitable pressure drop reduces delivered cleanroom airflow.Media area and pleat geometry are selected for the FFU operating face velocity.

Air bypasses the media through an incompatible gasket arrangement.Gasket material, width, thickness and upstream or downstream position are matched to the sealing surface.

Pleats are damaged during overhead handling and replacement.Optional upstream and downstream protective grids shield the media without blocking its open area.

Typical Applications

Cleanroom fan filter unitsLaminar-flow ceiling modulesMini-environment final filtrationFFU filter replacement programs

Technical Parameters

Typical construction ranges for replacement FFU mini-pleat HEPA filters are shown below.

Core Material	Water-resistant micro-glass-fiber HEPA media with hot-melt mini-pleat separators
Panel Thickness	50-120 mm nominal filter depth
Effective Width	305-610 mm nominal face width
Maximum Length	Up to 1220 mm nominal face length
Steel Facing Thickness	0.4-0.8 mm optional galvanized-steel protective grid wire or sheet
Core Density	Approximately 80-150 kg/m³ nominal pleated media-pack bulk density
Thermal Conductivity	Approximately 0.035-0.050 W/(m·K) for the dry glass-fiber media pack
Surface Finish	Natural anodized-aluminum frame with white media and dark-gray closed-cell gasket
Joint Type	Mini-pleat pack continuously potted into a mitered frame with compression-gasket seal
Customization	Available based on the intended application and operating environment.

Available Options

Matched HEPA efficiency classUpstream or downstream gasketSingle or double protective gridCustom FFU face size and depth

Planning a FFU HEPA Filter specification?

Send us your dimensions, installation conditions, performance targets and required surface finish.

Talk to Our Team