FFU and Terminal Air Purification Equipment

Cleanroom HEPA Terminal Housing

A fanless welded ceiling filter box that connects the supply duct to a sealed HEPA or ULPA panel and cleanroom diffuser with room-side service access.

Fully Welded Fanless Housing
Top or Side Duct Collar
Gel-Seal Filter Option
Interchangeable Diffuser Face

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Product Introduction

The cleanroom HEPA terminal housing forms the final sealed transition between a central air-supply duct and the cleanroom. Its fully welded steel plenum accepts a top or side collar, while an internal clamping frame holds a HEPA or ULPA panel against a gasket or gel knife edge. A hinged or quick-release room-side diffuser provides access to the filter, pressure port and upstream challenge connection. Because the module contains no fan, airflow is governed by the upstream air-handling system and an optional inlet damper, making it well suited to ducted pharmaceutical, laboratory and healthcare ceilings.

Key Features

Fully welded plenum seams create a continuous pressure boundary between the duct collar and filter seat.

Top, side-round or side-rectangular inlet positions accommodate different ceiling-clearance conditions.

Room-side clamps retain the filter evenly and allow replacement without removing the terminal box.

Interchangeable perforated, swirl or adjustable-nozzle faces adapt the discharge pattern to the room layout.

Customer Product Concerns

A terminal filter box must prevent bypass leakage, fit restricted ceiling space and remain serviceable without disturbing the supply duct.

Folded or spot-welded plenum seams can leak unfiltered supply air around the final filter.Continuous welded seams maintain a sealed pressure path from the duct inlet to the filter seat.

A centred top collar conflicts with structural members or shallow ceiling services.Alternative top, side-round and side-rectangular connections allow the plenum to fit the available space.

Uneven filter clamping leaves local gaps around a gasket or gel channel.Multiple room-side retaining points apply balanced compression around the complete frame.

One fixed diffuser pattern causes draughts or poor room mixing after a layout change.Replaceable front plates provide perforated vertical, swirl or adjustable radial discharge patterns.

Typical Applications

Pharmaceutical cleanroom ceilingsHospital isolation and procedure roomsBiotechnology laboratoriesFood and beverage controlled areasDucted microelectronics clean zones

Technical Parameters

Typical material and size ranges for a ducted cleanroom HEPA terminal housing are listed below.

Core Material	Fanless welded steel plenum with aluminium-frame micro-glass HEPA or ULPA mini-pleat filter
Panel Thickness	250-500 mm housing depth excluding duct collar
Effective Width	305-1220 mm nominal filter and diffuser width
Maximum Length	Up to 1220 mm standard terminal housing length
Steel Facing Thickness	1.0-1.5 mm fully welded powder-coated or stainless-steel plenum
Core Density	Approximately 90-120 kg/m³ compacted density of the HEPA or ULPA pack seated in the terminal housing
Thermal Conductivity	Approximately 0.035-0.043 W/(m·K) for the final-filter pack seated in the cleanroom terminal housing
Surface Finish	White epoxy-polyester powder coat or brushed 304 stainless steel
Joint Type	Welded duct plenum with room-side compression gasket or knife-edge gel-seal filter clamp
Customization	Available based on the intended application and operating environment.

Available Options

Top-round, side-round or side-rectangular inletHEPA H13-H14 or ULPA filterPerforated, swirl or adjustable-nozzle diffuserRoom-side pressure and aerosol test ports

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