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Terra Part #PriceShips in
240 V Powder-Coated Steel 2'x2' HEPA Room-Side 6601-22A-HR-220 68481 $1,4261-3 Days2
Stocked
240 V Powder-Coated Steel 2'x2' HEPA Top Side 6601-22-H-220 49141 $9591-3 Days3
Stocked
240 V Powder-Coated Steel 2'x2' ULPA Room-Side 6601-22A-UR-220 68482 $1,5501-3 Days4
Stocked
240 V Powder-Coated Steel 2'x2' ULPA Top Side 6601-22-U-220 49147 $1,0821-3 Days5
Stocked
240 V Powder-Coated Steel 2'x3' HEPA Room-Side 6601-23A-HR-220 68483 $1,4261-3 Days6
Stocked
240 V Powder-Coated Steel 2'x3' HEPA Top Side 6601-23-H-220 49138 $9591-3 Days7
Stocked
240 V Powder-Coated Steel 2'x3' ULPA Room-Side 6601-23A-UR-220 68484 $1,5501-3 Days8
Stocked
240 V Powder-Coated Steel 2'x3' ULPA Top Side 6601-23-U-220 49145 $1,0821-3 Days9
Stocked
240 V Powder-Coated Steel 2'x4' HEPA Room-Side 6601-24A-HR-220 68485 $1,4261-3 Days10
Stocked
240 V Powder-Coated Steel 2'x4' HEPA Top Side 6601-24-H-220 49136 $9591-3 Days11
Stocked
240 V Powder-Coated Steel 2'x4' ULPA Room-Side 6601-24A-UR-220 68480 $1,5501-3 Days12
Stocked
240 V Powder-Coated Steel 2'x4' ULPA Top Side 6601-24-U-220 49143 $1,0821-3 Days13
Stocked
240 V Stainless Steel 2'x2' HEPA Room-Side 6601-22A-HRSS-220 68744 $2,6441-3 Days14
Clearance
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240 V Stainless Steel 2'x2' HEPA Top Side 6601-22-HSS-220 62712 $1,9031-3 Days15
Clearance
Stocked
240 V Stainless Steel 2'x3' HEPA Room-Side 6601-23A-HRSS-220 68746 $2,5661-3 Days16
Clearance
Stocked
240 V Stainless Steel 2'x4' HEPA Room-Side 6601-24A-HRSS-220 68748 $2,6581-3 Days17
Clearance
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240 V Stainless Steel 2'x4' ULPA Room-Side 6601-24-URS-220 58081 $2,1201-3 Days18
Clearance
Stocked
120 V Powder-Coated Steel 2'x2' HEPA Room-Side 6601-22A-HR 68473 $1,1841-3 Days19
Stocked
120 V Powder-Coated Steel 2'x2' HEPA Top Side 6601-22-H 49139 $8721-3 Days20
Stocked
120 V Powder-Coated Steel 2'x2' ULPA Room-Side 6601-22A-UR 68474 $1,4091-3 Days21
Stocked
120 V Powder-Coated Steel 2'x2' ULPA Top Side 6601-22-U 49146 $9841-3 Days22
Stocked
120 V Powder-Coated Steel 2'x3' HEPA Room-Side 6601-23A-HR 68477 $1,1841-3 Days23
Stocked
120 V Powder-Coated Steel 2'x3' HEPA Top Side 6601-23-H 49137 $8721-3 Days24
Stocked
120 V Powder-Coated Steel 2'x3' ULPA Room-Side 6601-23A-UR 68478 $1,4091-3 Days25
Stocked
120 V Powder-Coated Steel 2'x3' ULPA Top Side 6601-23-U 49144 $9841-3 Days26
Stocked
120 V Powder-Coated Steel 2'x4' HEPA Room-Side 6601-24A-HR 68472 $1,1841-3 Days27
Stocked
120 V Powder-Coated Steel 2'x4' HEPA Top Side 6601-24-H 49135 $8721-3 Days28
Stocked
120 V Powder-Coated Steel 2'x4' ULPA Room-Side 6601-24A-UR 68479 $1,4091-3 Days29
Stocked
120 V Powder-Coated Steel 2'x4' ULPA Top Side 6601-24-U 49142 $9841-3 Days30
Stocked
120 V Stainless Steel 2'x2' HEPA Room-Side 6601-22A-HRSS 68738 $2,3511-3 Days31
Clearance
Stocked
120 V Stainless Steel 2'x2' HEPA Top Side 6601-22-HSS 62711 $1,7301-3 Days32
Stocked
120 V Stainless Steel 2'x3' HEPA Room-Side 6601-23A-HRSS 68740 $2,3511-3 Days33
Clearance
Stocked
120 V Stainless Steel 2'x3' HEPA Top Side 6601-23-HSS 62715 $1,7301-3 Days34
Stocked
120 V Stainless Steel 2'x4' HEPA Room-Side 6601-24-HRSS 69626 $2,4441-3 Days35
Clearance
Stocked
120 V Stainless Steel 2'x4' HEPA Top Side 6601-24-HSS 62719 $1,7301-3 Days36
Stocked
240 V Powder-Coated Steel 2'x2' ULPA Top Side 6601-22-U-220-CE 49330 $1,3341-3 Days37
Clearance
Stocked
240 V Powder-Coated Steel 2'x3' ULPA Top Side 6601-23-U-220-CE 49332 $1,3341-3 Days38
Clearance
Stocked
120 V Powder-Coated Steel 2'x4' HEPA Top Side 6601-24-H2 51421 $1,0071-3 Days39
Stocked
120 V Powder-Coated Steel 2'x3' HEPA Top Side 6601-23-H2 64781 $8725-9 Days40
120 V Powder-Coated Steel 2'x2' HEPA Top Side 6601-22-H-CA 68444 $9721-3 Days41
Stocked
120 V Powder-Coated Steel 2'x3' HEPA Top Side 6601-23-H-CA 68445 $9721-3 Days42
Stocked
120 V Powder-Coated Steel 2'x4' HEPA Top Side 6601-24-H-CA 68446 $9721-3 Days43
Stocked
120 V Powder-Coated Steel 2'x4' HEPA Top Side 6601-24-H-NC 69177 $7161-3 Days44
Stocked
Voltage
Material
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Filter
Filter Replacement Access
Item ordered before. Click on bagde to see the order.

Up to 30-day trial periods, free return shipping and on-site training available for qualified equipment.

Request demo from your product specialist or add note to your order or quote request.

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Product Details

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

• Three speed settings (Low/Medium/High) simplify air balancing

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

• Quiet, low-vibration FFU design: only 49 dBA, measured 30" from filter face @ 90 FPM

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

• 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

• WhisperFlow baffling technology supports uniform air speed across the filter face, ensuring laminar airflow

• Low-profile design allows cleanroom installation inside rooms with standard 9-foot ceilings

• Meets IEST Recommended Practices

• Models with all-stainless steel housing and filter frame meet strictest cleanroom requirements

• Speak with a Terra sales associate for recommendations on quantities to meet specified requirements

• Choose from cold rolled steel or all stainless steel housing

• Choose from room-side-replaceable or top-side-replaceable filter

• HEPA (High-Efficiency Particulate Air) filters are rated 99.99% efficient at removing particles ≥ 0.3 microns

• ULPA (Ultra-Low Penetration Air) filters are rated 99.999% efficient at removing particles ≥ 0.12 microns

• Provides years of no-maintenance, 24/7 operation (depending on air quality)

• Motor: 1/4 HP Direct drive, thermally protected with automatic overload reset

• Forward-curved centrifugal fans

• 1/4-20 UNC threaded inserts on corners to allow suspension by guy-wires

• MERV 7 pre-filter, 30% ASHRAE rated

• Low-profile design is ideal for cleanrooms with limited ceiling space

• 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

Power plug adapter

Stainless surface mount frame for installing FFU in ceiling without T-grid

12” ducted inlet connection adapter

Replacement filter

Filter replacement alarm

Eye bolt package

Ionizing bar

Pre-filter safety cover, for CE conformance

Control panel with night mode switch and power distribution modules

Unit of Measure: of 1

Marks & Listings: CE, UL, ULC

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

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.

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.

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.

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

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.

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.

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.

Full Range of Designs, Configurations!

WhisperFlow FFUs come in all styles: room-side replaceable, all-stainless steel, HEPA or ULPA filtration, EC energy-saving fans, reverse flow and more (shown: vapor filtration module with UV sanitation lamp).

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 25% as loud as 70dB).

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.
  • Power Distribution Modules for Cleanroom FFUs and Lights
    UL-listed power distribution modules include all breakers, transformers and other electrical components for FFU/light connections; allows fast addition or relocation of FFUs or lights without the need for rewiring.
  • Ionizing Bar; 22"L, with Installation Kit, for 24 x 24 Fan/Filter Unit
    Ionizing bar, mounted to Fan/Filter Unit, provides a balanced stream of ions to the work area below to neutralize static charge and prevent electro-static discharge; 22" bar shown installed on 2' x 2' FFU.
  • Night Service Saves Energy, Extends Filter Life!
    Night service switch, shown mounted on Modular Hardwall Cleanroom panel, puts FFUs in low-energy mode during off-hours; saves 25% of fan operating costs and extends filter life.
  • Filter Replacement Alarm
    The filter replacement alarm monitors filter backpressure and issues an alarm when filter needs replaced (requires selection of fan filter unit with challenge port, order separately).
  • Cord Adapter, MIN4 PL to 16AWG Power Cord for Terra Fan/Filter Unit
    Four-pin power cord adapter for fan/filter unit allows connection to standard 120VAC/60Hz power receptacle.
  • FFU Mounting Frame; Stainless Steel
    Stainless steel Fan Filter Unit (FFU) mounting frame supports FFU on drywall or other rigid ceiling material, viewed from above ceiling panel (FFU not included).
  • Fan Filter Unit Control System
    Provides room-by-room monitoring and control of Smart WhisperFlow FFUs to maintain target pressure differentials for ISO classification; temperature, humidity and particle monitoring and data logging, as well as dynamic fan set-point control, also available.
  • Filter Covers Allow Ceiling Wash-Down
    Ceiling panel covers allow wash-down and sterilization of cleanroom walls and ceilings without damage to filter medium; requires BioSafe glass or stainless steel wall panels, which stand up to biocides.
  • 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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