FFU and Terminal Air Purification Equipment

Aluzinc-Coated Steel Fan Filter Unit

A ceiling FFU with an aluminium-zinc-coated steel enclosure for applications that favor a natural metallic casing rather than an all-stainless or painted exterior.

Aluminium-Zinc Coated Casing
Natural Spangled Surface
Formed Sheet Construction
Separate Filter Frame

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Product Introduction

The Aluzinc-coated steel fan filter unit uses aluminium-zinc metallic-coated sheet for its formed casing and access cover. Folded edges shape the plenum around the fan and separate final-filter frame, while the natural spangled surface distinguishes the enclosure from a painted sheet or brushed stainless finish. Coating specification, exposed edges and fastener interfaces matter as much as the visible face when selecting this construction. The motor, controls and final filter are chosen separately from the enclosure material.

Key Features

Metallic-coated exterior

The casing uses a coated steel surface rather than relying solely on a decorative paint film.

Defined sheet-metal interfaces

Folded access edges and fastener positions allow the enclosure details to be specified for the installation.

Independent fan selection

Choose the drive and controller around the required operating point without confusing casing material with motor performance.

Serviceable filter arrangement

A separate filter frame allows the access route and sealing interface to be selected around maintenance needs.

Solutions for Your Application

A coated steel FFU should be selected for the environment in the ceiling void as well as the clean zone below it.

Two similar metallic casings have different durability.Compare their coating designation, exposed-edge treatment and service environment rather than using the spangle as a corrosion rating.

Moisture collects around the module above the ceiling.Address condensation and drainage at the enclosure location and select a material system suited to the actual wetting conditions.

Replacement fasteners create a different metal interface.Keep the specified fastener and isolation arrangement at covers and support points instead of selecting hardware only by thread size.

A housing comparison hides different filter and fan duties.Compare quotations using the same airflow, resistance, final-filter choice and service arrangement before judging the enclosure alternatives.

Typical Applications

Electronics assembly cleanroomsModular cleanroom ceiling baysControlled-environment production areasLaboratory clean-air supply zones

These are application examples for a metallic-coated enclosure, not approval for persistent condensation, chemical spray or washdown exposure.

Technical Parameters

Common reference casing and operating-configuration choices for an Aluzinc-coated FFU.

Enclosure Substrate	Steel sheet with an aluminium-zinc metallic coating
Coating Family	Common alloy family: approximately 55% aluminium, with zinc and silicon
Casing Footprint	Typical rectangular option: 1175 x 575 mm
Exterior Finish	Natural metallic spangle
Sheet-Metal Construction	Formed and folded enclosure with a removable cover
Fan-Drive Options	AC motor or EC motor configuration
Electrical Option	Common supply option: 230 V AC
Reference Face Velocity	Typical FFU selection target: 0.45 m/s
Final-Filter Options	HEPA or ULPA panel with a separately matched support frame and seal
Outlet Construction	Perforated outlet grille below the final-filter frame
Maintenance Options	Upper-plenum or room-side filter service
Customization	Available based on the intended application and operating environment.

Available Options

Natural metallic or coated exteriorAC or EC fan driveGasketed or gel-seal final-filter frameUpper-access or clean-side filter replacement

The supplied combination should identify the controller, filter and enclosure finish together. Clean-side filter access does not imply clean-side motor removal or automatic airflow regulation.

Selection and Installation

Specify the coated sheet, not just its appearance

Identify the base steel, metallic-coating designation and mass, surface treatment and exposed edge treatment in the material schedule. A visible spangle does not establish the coating composition or durability. Describe likely condensation, salt exposure and cleaning chemicals; aluminium-zinc coating must not be treated as a universal substitute for stainless steel in wet or chemically aggressive conditions.

Compare operating data independently of the casing

Provide the target air volume and system resistance, then compare the selected fan/filter combination at that duty point. Obtain the supply voltage, frequency, phase, input power, controller arrangement and acoustic test conditions for the actual variant. AC and EC are alternatives, not proof of a particular network function or constant-flow control. The EC fan filter unit page explains the separate drive-selection considerations.

Protect surfaces during overhead installation

Use the defined lifting and support points, protect the coated sheet from dragging and remove cutting or drilling debris. The drawing should establish module dimensions, mass, flange engagement and the access needed around the top fan and terminal box. Do not drill additional suspension holes or attach dissimilar-metal hardware without the specified interface detail.

Choose maintainable filter access

State whether filter replacement must take place from above the ceiling or from the room. Confirm the matching filter size, sealing profile and removal space; a hinged grille alone does not establish the complete replacement procedure. Keep the enclosure dry where practical and use a compatible surface-cleaning method without wetting the media or electrical components. After service, inspect the seal and measure installed airflow rather than relying on motor speed alone.

Planning a Aluzinc-Coated Steel Fan Filter Unit specification?

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

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