Terra Part # 6601-22A-URE
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Fan Filter Unit; Explosion-Proof, RSR, 2'x2', ULPA, 120/240 V, Stainless Steel, WhisperFlow
  • Customer must determine if filter system leakage testing is required for their application. This unit is not full seam welded. If a leak test is required, full seam welded units leak-tested to meet ISO 14644-3 are optionally available.
  • Includes FDA-approved silicone sealant (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
  • All wiring embedded in filled, rigid conduit in accordance with Class I/II requirements
  • Motor: 1 Speed direct-drive, 0.25HP, 1140 RPM, fan-cooled
  • 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.
  • Explosion-proof motor meets NEC requirement for Class I Group C and D, Class II Group F and G, Division 1 hazardous locations
  • Room-Side Replaceable (RSR) design allows quick filter replacement from the inside of the cleanroom. Because it eliminates the need for roof access or breaching the cleanroom, an RSR model greatly reduces maintenance time and 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.
  • All-304 stainless steel BioSafe® housing, baffle plate, filter face grille, filter frame and impeller 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
  • 1/4-20 UNC threaded inserts on corners to allow suspension by guy-wires
  • MERV 7 pre-filter, 30% ASHRAE rated
  • Filters are leak tested in accordance with IEST standards and meet UL 900
  • See performance data and submittal sheets for additional information
  • Optional Accessories:
  •           Challenge port kit
  •           Stainless surface mount frame for installing FFU in ceiling without T-grid
  •           12" ducted inlet connection adapter
  •           Replacement filter
  •           Eye bolt package
  •           Pre-filter safety cover, for CE conformance
  • All filter sales are final; returns for this item cannot be accepted

Type: Explosion-Proof, RSR

Material: Stainless Steel

Filter Replacement Access: Room-Side

Size: 2'x2'

Filter Frame Material: 304 Stainless Steel

Filter: ULPA

Motor Type: Permanent Split capacitor (PSC)

Airflow: Positive Pressure

Special Application: Explosion-Proof

Unit of Measure: EA

Marks & Listings: UL, ULC

Electrical Specifications: 120/240 V, 6.8 A, 816 W, 60 Hz

Weight, Product: 105 Lbs

Dimensions, Product: 23.72"W x 23.63"D x 19.86"H

Weight, Shipping: 125 lb

Dimensions, Shipping: 53"W x 53"D x 20"H

Package Type: Palletized

Manuals & Resources

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  1. Safely neutralizes surface charges to protect against electro-static discharge (ESD) | 2005-06A displayed
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  2. Eyebolt with 1/4"-20 thread for lifting FFUs | 6601-02 displayed
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  3. Holds fan filter units secure in rigid ceilings without a T-bar grid. | 6604-00 displayed
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  4. Simplifies filter leak testing and connection of Filter Backpressure Alarm | 6601-99 displayed
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  5. Cable Extension, PVC, 4 Poles, 5M, 22awg, 300V, straight male to straight female with close-up | 6601-39 displayed
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  6. FFU Connect pack includes flexible ducting and all hardware required to connect and seal the duct. | 6601-01 displayed
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  7. FFU Testing and Certification; Flow Rate and Filter integrity
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  8.  | 9999-68 displayed
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  9. FasTrak 24-7 Expediting Service
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  10. MERV 7 pre-filter for Terra Fan Filter Units (FFUs) | 6601-34 displayed
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Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
  • Explosion-Proof Fan-Filter Unit Explosion-Proof Fan-Filter Unit
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

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 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.

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

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.

Airflow Uniformity Improves Laminar Flow

Non-uniform air speeds produce turbulence that can recirculate particles into the air stream. Unique WhisperFlow® FFU baffling system and anodized diffuser plate promotes uniform laminar airflow to minimize turbulence and effectively carry away contaminating particles.

Network of International Reps

Terra employs an international network of more than 20 local sales reps trained to provide comprehensive service on Terra's complete catalog of products

Popular Accessories

For a full list of accessories, select a product then click Choose Accessories on that product page.
  • 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).
  • Safely Mount FFU’s Above Floor for Horizontal Laminar Airflow
    The portable FFU base stand can be easily positioned to supply Class 100 horizontal laminar flow into a room or enclosure. It can also be positioned next to sensitive equipment/materials that are mounted close to the floor.

On a tight schedule? Choose FasTrak 24/7 Priority Service to help meet your critical schedule for Terra-manufactured products, either before or after your order is placed.*

  • FasTrak 24/7 provides a 24/7 commitment to meet the shipping date YOU specify, regardless of quoted lead times.
  • FasTrak 24/7 assigns a dedicated production team plus a dedicated senior expeditor working three shifts to meet your delivery specification.
  • FasTrak 24/7 guarantees* to meet the agreed-to specified ship date.

Call for pricing. FasTrak service fees cover costs of additional services only, without additional profit.

 * Terra's FasTrak services limited guarantee: to ship on the ESD or date specified OR to refund up to 100% of FasTrak charges. This guarantee covers no direct, special, consequential or other damages and is strictly limited to up to 100% of the amount paid for FasTrak service. When a specified ship date is missed due to factors outside Terra's control (vendor performance, deliveries by shipping companies, etc.) and random factors such as accidents, the credit of up to 100% of the FasTrak 24/7 may not apply. FasTrak service requested after order placement will be quoted and accepted based on available time remaining before required ship date.

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