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Filter Replacement Access

Terra Part #PriceShips in
120/230 VPowder-Coated Steel2'x2'HEPARoom-Side 6601-22B-HR-EC 72770 $2,0421-3 Days2
Stocked
120/230 VPowder-Coated Steel2'x2'HEPATop Side 6601-22A-H-EC 72775 $1,3211-3 Days3
Stocked
120/230 VPowder-Coated Steel2'x2'ULPARoom-Side 6601-22B-UR-EC 72774 $2,0225-9 Days4
120/230 VPowder-Coated Steel2'x2'ULPATop Side 6601-22A-U-EC 72836 $1,5631-3 Days5
Stocked
120/230 VPowder-Coated Steel2'x3'HEPARoom-Side 6601-23B-HR-EC 72881 $2,0041-3 Days6
Stocked
120/230 VPowder-Coated Steel2'x3'HEPATop Side 6601-23A-H-EC 72884 $1,3211-3 Days7
Stocked
120/230 VPowder-Coated Steel2'x3'ULPARoom-Side 6601-23B-UR-EC 72883 $2,0221-3 Days8
Stocked
120/230 VPowder-Coated Steel2'x3'ULPATop Side 6601-23A-U-EC 72891 $1,5635-9 Days9
120/230 VPowder-Coated Steel2'x4'HEPARoom-Side 6601-24B-HR-EC 72936 $2,1431-3 Days10
Stocked
120/230 VPowder-Coated Steel2'x4'HEPATop Side 6601-24A-H2-EC 72939 $1,5875-9 Days11
120/230 VPowder-Coated Steel2'x4'ULPARoom-Side 6601-24B-UR-EC 72938 $2,0225-9 Days12
120/230 VPowder-Coated Steel2'x4'ULPATop Side 6601-24A-U-EC 72945 $1,5631-3 Days13
Stocked
120/230 VStainless Steel2'x2'ULPARoom-Side 6601-22B-URSS-EC 73539 $3,0801-3 Days14
Stocked
120/230 VStainless Steel2'x2'ULPATop Side 6601-22A-USS-EC 72879 $2,5641-3 Days15
Stocked
120/230 VStainless Steel2'x3'HEPARoom-Side 6601-23A-HRSS-EC 70982 $2,9451-3 Days16
Clearance
Stocked
120/230 VStainless Steel2'x3'ULPARoom-Side 6601-23B-URSS-EC 73540 $3,0805-9 Days17
120/230 VStainless Steel2'x3'ULPATop Side 6601-23A-USS-EC 72892 $2,5641-3 Days18
Stocked
120/230 VStainless Steel2'x4'HEPATop Side 6601-24A-HSS-EC 72942 $2,2941-3 Days19
Stocked
120/230 VStainless Steel2'x4'ULPARoom-Side 6601-24B-URSS-EC 73541 $3,0801-3 Days20
Stocked
120/230 VStainless Steel2'x4'ULPATop Side 6601-24A-USS-EC 72946 $2,5641-3 Days21
Stocked
120/230 VPowder-Coated Steel2'x2'HEPATop Side 6601-22A-H-EC-CA 72776 $1,4071-3 Days22
Stocked
120/230 VPowder-Coated Steel2'x3'HEPATop Side 6601-23A-H-EC-CA 72885 $1,4071-3 Days23
Stocked
120/230 VPowder-Coated Steel2'x4'HEPATop Side 6601-24A-H-EC 72940 $1,3211-3 Days24
Stocked
120/230 VPowder-Coated Steel2'x4'HEPATop Side 6601-24A-H-EC-CA 72941 $1,4071-3 Days25
Stocked
Voltage
Material
Size
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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Custom-configured product: Terra will quote.
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Product Details

• EC brushless motors for quiet, energy-efficient operation and infinitely variable speed control

• Provides much wider flow range, 110 to 1117 CFM, ideal for applications with high static pressure

• Connect to automatic smart console for centralized fan control and cleanroom pressure balancing

• Low-heat and low-noise production only 40 dBA, measured 12" from filter face @ 90 FPM

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

• Ships in 120V configuration. Can be easily be reconfigured to 230V

• WhisperFlow® baffling technology supports uniform velocity across the face of the filter for truly laminar air flow

• Choose from powder-coated steel or all stainless steel housing

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

• 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

• Forward-curved centrifugal fans

• Generate less vibration, noise and heat than standard FFUs with AC motors

• Ethernet ports for remote monitoring and control

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

• Includes a Merv 7 pre-filter and main HEPA or ULPA filter to help meet ISO cleanliness standards

• HEPA filters remove particles down to 0.3 µm at 99.99% efficiency

• ULPA filters remove particles down to 0.12 µm at 99.999% efficiency

• Complies with Title 24 and ErP 2015 Directive

• Brushless EC motors have internal micro-processors

• 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

• 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

Fan Filter Units

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

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
HEPA/ULPA filtration diagram with examples of filtered contaminants

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.

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.

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).

Smart Fan Filter Unit with EC Motor

Smart WhisperFlow® Fan Filter Units are quiet, energy-efficient and easily adjustable, either manually or via automatic smart console, for centralized fan speed control and cleanroom pressure balancing.

Catalog of CE-Marked Products

Terra offers over 1,700 CE-marked products configured for international voltage requirements

Available Accessories

Popular Accessories

For a full list of accessories, select a product then click Choose Accessories on that product page.
  • 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.
  • 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).
  • 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.
  • Challenge Port; for Fan/Filter Unit
    Challenge port for Fan/Filter Units simplifies filter leak testing and connection of Filter Backpressure Alarm (shown mounted on SS FFU, order separately).
  • 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.
  • 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).
  • 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.
  • 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.
  • 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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Manuals & Resources

Manuals & Resources

Blog Post

Air Shower Protection for Cannabis Grow Rooms

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