FFU and Terminal Air Purification Equipment

Explosion-Proof Fan Filter Unit

A hazardous-duty FFU built with a non-sparking blower, cast-metal motor enclosure, sealed electrical path and grounded filter frame for clean areas handling flammable vapors or dusts.

Non-Sparking Blower Assembly
Cast-Metal Motor Enclosure
Sealed Junction Box and Conduit
Bonded Grounding Path

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Product Introduction

The explosion-proof fan filter unit isolates electrical and rotating ignition sources with a heavy cast-metal motor enclosure, bolted junction box, rigid conduit and sealed fittings. A non-sparking impeller moves air through the prefilter and final filter, while a dedicated bonding strap connects the casing and metal prefilter frame to ground. The reinforced stainless or rolled-steel plenum supports the heavier drive assembly and uses a baffled diffuser to distribute airflow. Electrical voltage, enclosure construction and hazardous-area suitability are selected to match the intended process environment.

Key Features

A non-sparking impeller and enclosed direct-drive motor reduce exposed friction and electrical ignition sources in the intake stream.

Bolted cast-metal junction hardware contains electrical terminations and connects through rigid sealed conduit.

A visible bonding strap links removable metal filter components to the grounded FFU casing.

The reinforced frame carries the concentrated motor load without distorting the filter seal or ceiling flange.

Customer Product Concerns

A hazardous clean area must control particles while preventing the fan, wiring and removable prefilter from introducing an avoidable ignition source.

An ordinary open motor and switch can expose arcing components to flammable vapor above the cleanroom ceiling.The motor, terminals and switching path are enclosed in bolted cast housings connected by rigid sealed conduit.

A metal prefilter can accumulate static charge when dry process air passes through its frame.A dedicated grounding clip and bonding lead connect the removable prefilter frame to the FFU enclosure.

A conventional steel impeller may create a spark if it contacts the inlet or housing after damage.The selected non-sparking impeller material and guarded clearances reduce metal-to-metal contact risk.

The heavy hazardous-duty motor can twist a light ceiling module and break filter compression.Reinforced mounting rails and corner brackets transfer the motor load around the sealed filter frame.

Typical Applications

Solvent-handling cleanroomsHazardous powder processing suitesBattery electrolyte preparation areasChemical dispensing enclosuresClean zones requiring sealed hazardous-duty electrical hardware

Technical Parameters

Typical construction ranges for a hazardous-duty explosion-proof fan filter unit are listed below.

Core Material	Reinforced stainless or powder-coated steel plenum, non-sparking centrifugal impeller, cast-metal motor enclosure and micro-glass HEPA or ULPA filter
Panel Thickness	450-550 mm overall module depth including the hazardous-duty motor assembly
Effective Width	575-610 mm nominal module width
Maximum Length	Up to 1220 mm standard module length
Steel Facing Thickness	1.2-2.0 mm reinforced stainless or powder-coated rolled-steel housing sheet
Core Density	Approximately 90-120 kg/m³ nominal compacted density of the final-filter pack used in the explosion-protected FFU assembly
Thermal Conductivity	Approximately 0.035-0.043 W/(m·K) for the dry final-filter pack used in the explosion-protected FFU assembly
Surface Finish	Brushed stainless steel or chemically resistant powder coating with grounded bare-metal bonding points
Joint Type	Reinforced ceiling flange with bonded perimeter gasket and room-side gel-seal or compression-seal filter interface
Customization	Available based on the intended application and operating environment.

Available Options

120, 208-240 or 277 V motor configurationStainless or powder-coated reinforced housingGrounded room-side replaceable HEPA or ULPA filterHazard-specific conduit, junction and grounding arrangement

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