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Voltage Material Size Filter Filter Replacement AccessPriceUsually Ships inStocked
120 VStainless Steel2'x4'ULPATop Side $5,8031-3 Days Stocked
120 VStainless Steel2'x2'ULPATop Side $5,8031-3 Days Stocked
120 VStainless Steel2'x3'ULPATop Side $5,8031-3 Days Stocked
120/240 VStainless Steel2'x4'ULPARoom-Side w/ Dust Collector Pan $6,16710-14 Days
120/240 VStainless Steel2'x2'ULPARoom-Side w/ Dust Collector Pan $6,16710-14 Days
120/240 VStainless Steel2'x3'ULPARoom-Side w/ Dust Collector Pan $6,16710-14 Days


  • Exhaust flow fan filter unit convert any room into a negative pressure isolation/containment room
  • Explosion-proof FFU meets NEC requirements for Class I/Class II, Division 1 Hazardous locations
  • Non-sparking motor, mounted in a cast-iron, explosion-proof housing
  • Mounts into ceiling bay to remove sub-micron particles and provide safe exhaust
  • Minimize cleanroom service downtime with room-side-replaceable (RSR) fan filter units
  • Explosion-Proof Design:
  • Explosion-proof motor meets NEC requirement for Class I Group C and D, Class II Group F and G, Division 1 hazardous locations.
  • All wiring embedded in filled, rigid conduit in accordance with Class I/II requirements.
  • NOTE: Proper installation of explosion proof equipment is critical to maintaining the explosion-proof protection aspects of the system. Therefore all wiring for explosion proof systems should be done in the field per local code by a licensed electrician.
  • FFU Design:
  • All-304 stainless steel BioSafe® housing, baffle plate, filter face grille, and filter frame ensure optimal cleanliness and stand up to alcohol and other cleaning agents.
  • Internal baffling plate and diffuser panel provide quiet uniform air flow across the filter face.
  • 1/4 (6 mm) -20 threaded holes in top corners accommodate eyebolts to facilitate installation using suspended guy wires (order eye bolt package separately).
  • FDA-approved silicone sealant without harmful chemicals seals inside housing to prevent air leakage (specify acrylic urethane or other required sealant type when FFU is ordered).
  • ULPA Filter: 99.999% efficient Ultra-Low Penetration Air, rated at particles 0.12µm diameter, shipped uninstalled to prevent damage during shipping.
  • Medical grade filters are leak tested in accordance with IEST standards and meet UL 900.
  • See performance data and submittal sheets for additional information.
  • NOTE: Because filters are delicate and subject to damage during handling, all filter sales are final; no returns can be accepted.
  • Room-Side Replaceable (RSR) Filter for Bag-in/Bag-out (BIBO) Replacement:
  • RSR designs allow quick and safe Bag-in/Bag-out (BIBO) filter replacement from the inside of the room for contact-free removal of filters with potentially hazardous airborne contaminants. Because it eliminates the need for roof access or breaching the cleanroom, an RSR model also greatly reduces maintenance time and related costs.
  • Gel-sealed filter seats securely against a knife-edge on the fan housing.
  • Easy-open clips allow fast filter replacement from the room side without breaching the cleanroom ceiling.
  • Filter shipped uninstalled to prevent shifting in the mounting gel that could cause leaks.
  • Dust Collector Pan:
  • Collector pan accumulates dust particles that dislodge from the HEPA filter, preventing contaminants from re-entering the cleanroom. Collector pan is easily removed for cleaning or maintenance.
  • For applications involving toxic fumes or biohazards, module seamlessly integrates with bag-in/bag-out system for safe filter disposal and replacement.
  • Optional Accessories:
  • Stainless steel surface mount frame for installing FFU in ceiling without T-grid.
  • 12” duct adapter for connection to safe exhaust outside of room.
  • Top safety cover, for CE conformance.
  • Replacement filters.
  • Eye bolt package for cable suspension.
  • Includes:
  • (1) Dust collector pan.
  • (1) MERV 7 filter (30% ASHRAE rated), 19.5" x 19.5" x 7/8" thk.

Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
Terra Universal WhisperFlow® Filter Fan Units

Features and Benefits

Diffuser Panel Promotes Air Flow Uniformity and Protects Filter Integrity

Unlike other manufacturers, Terra’s FFUs include a unique perforated panel beneath the filter, acting as a shower head, to guarantee filter protection and laminar air flow uniformity which prevents localized air swirling, particle build-up and turbulence.

Protect Against Contaminants and Pathogens

HEPA and ULPA filters help capture many bacteria, viruses (COVID-19), and mold spores that contribute to a host of infections for both humans and plant/animal tissue cultures

Non-Sparking Direct-Drive Motor

Explosion-proof motors use a non-sparking polypropylene fan and cast-iron brackets attached to the heavy duty rolled steel frame

Gel-Filled Channel on Room-Side Replaceable Filter

Gel-filled channel on room-side replaceable filter forms a tight seal against knife edge on fan housing, allowing fast, simple filter replacement from inside the cleanroom without the need for costly cleanroom shut-down.

Explosion-Proof Junction Box

The reinforced junction box of the explosion-proof fan filter unit is built to withstand and contain an explosive reaction within the conduit system.

Long Running FFU Motors

Terra’s filter fan unit motors are rated for 5 years of continuous, 24/7 operation, if the HEPA filters are consistently replaced. To accurately monitor your HEPA filter’s saturation levels, purchase Terra’s audible and visual filter replacement alarm system.

Easy-Release Filter Clamp on Room-Side Replaceable FFU

Easy-release clamps rotate to release filter on Room-Side Replaceable Fan Filter Units, simplifying filter servicing without the need for a cleanroom shut-down.

Explosion-Proof Power Switches

UL-rated explosion-proof switches are connected to the lights and blowers using specialized conduit with potted fittings. All electrical components are sealed to eliminate potential ignition points.

Explosion-Proof Potted Fittings

Conduit is filled with an expanding cement mixture to isolate explosion-proof components from potential sources of ignition; explosion-proof fittings meet requirements of NEC for Class I, Division 1 hazardous locations.

Pre-Filter Grounding Clip

A grounding wire connects the body of the Explosion-Proof FFU to a metal wireframe embedded in the pre-filter as a safeguard against sparking.

WhisperFlow Quiet Operation Reduces Distracting Background Noise

Exposure to loud noises can lower the ability to focus on work and listen selectively, which may also lead to safety issues. Typical AC units can be annoyingly loud, measuring in the range of 70 dB (comparable to a vacuum cleaner). Terra’s WhisperFlow design produces far lower noise levels for a quiet environment comparable to a library. At 90 ft/min output, units measure under 50 dB from only 1 ft away (roughly 75% quieter than 70dB).

Product Prices Honored Worldwide

From Argentina to Zimbabwe, Terra's customers pay a single web-listed price for each product

Multilingual Website Translator

Easily transcribe the verbaige on Terra's website into more than 80 different languages using our website translator tool

Catalog of CE-Marked Products

Terra offers over 1,700 CE-marked products configured for international voltage requirements
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
  • Energy-Efficient Lighting

    Energy-efficient LED lighting panels and strips help to lower electrical costs and minimize heat build-up in temperature-controlled environments.
  • Explosion-Proof 40W LED Light

    UL-listed for Class I, Division 1 and 2, Groups C and D areas, this low profile LED light produces 3,600 lumens and operates from 120 to 277VAC, 50/60Hz. The heat-dissipating housing increases the efficiency and lifespan of the LEDs.
  • Explosion-Proof Power Distribution Module

    Explosion-Proof Power Distribution Module (PDM) meets NEC code for a Class I/Division 1 hazardous location; includes all relays, breaks and other cleanroom electrical components
  • Challenge Port for Fan Filter Unit

    Challenge port for Fan/Filter Units simplifies filter leak testing and connection of Filter Backpressure Alarm (shown with optional pressure gauge; must be ordered with FFU).
  • Replacement Filters

    Purchase replacement filters ahead of time to prevent costly operational interruptions and avoid damage to fan blowers caused by excessive backpressure from long overdue filter replacements.
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