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Terra Part #PriceShips in
120/240 V Stainless Steel 2'x2' ULPA Room-Side 6601-22A-URE 68505 $4,10610-14 Days2
120/240 V Stainless Steel 2'x2' ULPA Top Side 6601-22-UESS 70318 $4,7240-6 Days3
120/240 V Stainless Steel 2'x3' HEPA Top Side 6601-23-HESS 70316 $3,8991-3 Days4
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120/240 V Stainless Steel 2'x3' ULPA Room-Side 6601-23A-URE 68507 $4,10610-14 Days5
120/240 V Stainless Steel 2'x4' HEPA Top Side 6601-24-HESS 70312 $3,89910-14 Days6
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120/240 V Stainless Steel 2'x4' ULPA Room-Side 6601-24A-URE 68508 $4,1061-3 Days7
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120/240 V Stainless Steel 2'x4' ULPA Top Side 6601-24-UESS 70317 Request Quote1-3 Days8
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Up to 30-day trial periods, free return shipping and on-site training available for qualified equipment.

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Product Details

• 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

• Cleanroom FFU provides avg velocity of 90+ FPM, airflow of 640+ CFM

• Internal baffling plate and diffuser panel provide quiet and uniform air flow across the filter face

• Minimize cleanroom service downtime with room-side-replaceable (RSR) fan filter units

• Explosioon-proof FFU permits single speed operation (on/off).

• 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.

• Room-side-replaceable filter units feature a Gel-sealed filter and easy-open clips to allow fast filter replacement from below without breaching the cleanroom ceiling

• Select HEPA filter (99.99% efficient @ 0.3 µm) or ULPA filter 99.999% efficient @ 0.12 µm)

• Direct-drive 0.25HP fan-cooled motor is designed for continuous-duty operation

• All FFU data is based on a standalone unit using 1” prefilter and clean filters.

• Data will vary depending on filter media and configurations with other products/systems, such as ductwork or hoods.

See performance data and submittal sheets for additional information

Unit of Measure: of 1

Marks & Listings: UL, ULC

Fan Filter Units

  • Explosion-Proof Fan-Filter Unit Explosion-Proof Fan-Filter Unit
Explosion-Proof Fan-Filter Unit

Features & Benefits

Features and Benefits

Filter Fan Units Prevent Infection

Did You Know?
HEPA/ULPA Filters Do More Than Meet ISO Requirements - they also prevent infection.

Most cleanroom professionals understand that HEPA and ULPA filters capture contaminants that degrade particle-sensitive samples. But they also help remove bacteria, mold spores, and many viruses that contribute to a host of infections.

Most common bacteria are contained by the 0.3-micron pore size of high-efficiency particular air (HEPA) filters. Ultra-Low Penetration Air (ULPA) filters, which are rated 99.999% efficient at retaining particles of 0.12 microns and larger in diameter, capture ultra-fine contaminants, including many large viruses and mold spores.

These filters also remove aerosol-born pathogens - germs that hitch a ride on larger particles and liquid droplets that are captured in a HEPA or ULPA filter. HEPA- or ULPA-based Fan/Filter Units (FFUs) thus can play an important role in infection prevention in surgical theaters, ICUs and other medical settings.

Additionally, HEPA filters can help filter pollen, tiny insects, bacteria, mold, and other fungal spores that might be present during plant tissue culture or cannabis production. Contaminants such as these can find a way in via personnel or normal HVAC units and can blight crops and reduce yields. HEPA Filters help increase crop yields, pass inspection/meet regulations, and reduce contamination.

Here is a list of common human pathogens that HEPA/ULPA filters capture and remove from circulation:

Pathogens: Bacteria and Diseases
  • SARS-CoV-2: Coronavirus (COVID-19)
  • Escherichia coli: Gastrointestinal infection
  • Bacillus anthracis : Anthrax
  • Aspergillus brasiliensis: Sinus infections
  • Francisella tularensis: Tularemia
  • Bordetella pertusis : Whooping cough
  • Mycoplasma pneumoniae: Pneumonia
  • Chlamydia pneumoniae: Bronchitis
  • Clamydia psittaci : Psittacosis
  • Klebsiella pneumoniae: Opportunistic infections
  • Haemophilus influenzae : Meningitis
  • Coxiella burnetii: Q fever
  • Pseudomonas aeruginosa: Opportunistic infections
  • Actinomyces israelii: Actinomycosis
  • Legionella pneumophila: Legionaire's disease
  • Thermoactinomyces sacchari: Farmer's lung
  • Alkaligenes: Opportunistic infections
  • Streptococcus pyogenes: Scarlet fever
  • Mycobacterium Tuberculosis: Tuberculosis

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.

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.

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.

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.

Highest Standards For Electronic Components

Terra’s electronic components are designed and built to the highest standards required by defense and semiconductor industries for long-term reliability and protection against damage, injuries, and electrical hazards.

Continuous Product Improvement

At Terra, we strive to develop and produce the highest quality products for our customers to improve health, safety, performance, and yields. Our product quality is enabled by high-grade manufacturing equipment and processes, 45 years of engineering and application expertise, and our commitment to continuously improve.

Comprehensive Product Portfolio

Terra’s comprehensive product portfolio includes solutions for every application and budget. Our technical sales staff will guide you toward the product most suitable for your requirements.

Long-Term Customers

Terra is committed to building long-term relationships with satisfied clients; 94% of orders each year come from repeat customers

Available Accessories

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.

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Manuals & Resources

Manuals & Resources

Blog Post

Air Shower Protection for Cannabis Grow Rooms

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