Terra Part # 6601-22-H
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Fan Filter Unit; WhisperFlow, 2'x2', HEPA, 120 V, Powder-Coated Steel

• High Efficiency Particulate Air (HEPA) Filter: 99.99% efficient at 0.3µm particle diameter

• AC 3-speed blower motor

• FDA-approved silicone sealant

• 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

• Removable yellow power cord with 4-pin connector for easy installation to Terra cleanrooms (connector may be used with an optional wall plug adapter; or may be removed entirely to hard-wire the FFU)

• 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

All filter sales are final; returns for this item cannot be accepted

Type: WhisperFlow

Material: Powder-Coated Steel

Filter Replacement Access: Top Side

Size: 2'x2'

Filter Frame Material: Aluminum

Filter: HEPA

Motor Type: Permanent Split capacitor (PSC)

Motor HP: 1/4 hp

Airflow: Positive Pressure

Speed Control: 3-Speed Switch

Blower Type: Forward Curved

Active Filter Face Area: 3.4 ft²

Pre-Filter: MERV 7

Unit of Measure: EA

Marks & Listings: UL, ULC

Electrical Specifications: 120 V, 3.8 A, 1 Ph, 60 Hz

Weight, Product: 44 lb

Dimensions, Product: 23.63"W x 23.63"D x 13"H

Weight, Shipping: 45 lb

Dimensions, Shipping: 35"W x 29"D x 20"H

Package Type: Palletized

Manuals & Resources

Buy Accessories
  1. Safely neutralizes surface charges to protect against electro-static discharge (ESD) | 2005-06A displayed
    $664
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  2. Holds fan filter units secure in rigid ceilings without a T-bar grid. | 6604-00 displayed
    $369
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  3. Simplifies filter leak testing and connection of Filter Backpressure Alarm | 6601-99 displayed
    $78
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  4. Night service switch, shown mounted on Modular Hardwall Cleanroom panel, puts FFUs in low-energy mode during off-hours | 6601-70 displayed
    $141
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  5. Suitable for air handling | 6602-40 displayed
    $157
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  6. Four-pin power cord adapter for fan/filter unit allows connection to standard 120VAC/60Hz power receptacle | 6601-13 displayed
    $55
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  7. Eyebolt with 1/4"-20 thread for lifting FFUs | 6601-02 displayed
    $22
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  8. FFU Connect pack includes flexible ducting and all hardware required to connect and seal the duct. | 6601-01 displayed
    $194
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  9. FFU Testing and Certification; Flow Rate and Filter integrity
    Request Quote
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  10. FasTrak 24-7 Expediting Service
    Request Quote
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  11. High Efficiency Particle Filter is rated 99.99% efficient @ 0.3 µm diameter particles | 6601-25 displayed
    $413
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  12. MERV 7 pre-filter for Terra Fan Filter Units (FFUs) | 6601-34 displayed
    $158
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  13. High Efficiency Particle Filter is rated 99.99% efficient @ 0.3 µm diameter particles | 6601-25 displayed
    $413
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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.

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.

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 75% quieter than 70dB).

Wide Selection of Global Shipping Options

Terra offers a broad range of global shipping services including door-to-door and white glove delivery

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.
  • 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.

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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