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4x4 WhisperFlow Fan/Filter Unit with brushless energy-efficient EC motor and filter for cleanroom applications
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Product Group:
6601-PP-70
6601-PP-70

4' x 4' Fan Filter Units

Manufactured By: Terra Universal
  • Available Certified ISO Grade Designs: ISO 5, ISO 6, ISO 7, ISO 8
  • Backward inclined blower wheel for efficiency in airflow performance
  • Finger guard protected inlet to protect users and the equipment
  • Electronically commutated motor (EC) offers quiet, reliable operation with minimal energy consumption
  • HEPA and ULPA configurations accommodate diverse cleanliness requirements
  • MODBUS® networking control card with closed-loop control capability

• Unit of Measure: of 1

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Manufactured By: Terra Universal
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 Terra Part #Price Ships in
120 V Aluminum 4'x4' HEPA Room-Side 665 to 1900 CFM 4-Pin 6601-44A-HR $3,300 42-48 Days2
120 V Aluminum 4'x4' HEPA Top Side 740 - 1950 CFM 4-Pin 6601-44A-H $2,100 42-52 Days3
120 V Stainless Steel 4'x4' HEPA Room-Side 665 - 1900 CFM 4-Pin 6601-44A-HRSS $5,300 42-48 Days4
120 V Stainless Steel 4'x4' HEPA Top Side 740 to 1950 CFM 4-Pin 6601-44A-HSS $4,100 42-52 Days5
115/208-230/277 V Powder-Coated Steel 4'x4' HEPA Room-Side 665 to 1900 CFM 4-Pin 6601-44B-HR $4,791 30-45 Days6
115/208-230/277 V Powder-Coated Steel 4'x4' HEPA Top Side 740 - 1950 CFM 4-Pin 6601-44B-H $3,591 30-45 Days7
115/208-230/277 V Stainless Steel 4'x4' ULPA Room-Side 665 - 1900 CFM 4-Pin 6601-44B-URSS $6,756 30-45 Days8
115/208-230/277 V Stainless Steel 4'x4' ULPA Top Side 740 to 1950 CFM 4-Pin 6601-44B-USS $5,556 30-45 Days9
208-240V Aluminum 4'x4' HEPA Room-Side 665 to 1900 CFM 4-Pin 6601-44A-HR-220 $3,300 42-48 Days10
208-240V Aluminum 4'x4' HEPA Top Side 740 - 1950 CFM 4-Pin 6601-44A-H-220 $2,100 42-52 Days11
208-240V Stainless Steel 4'x4' HEPA Room-Side 665 to 1900 CFM 4-Pin 6601-44A-HRSS-220 $5,300 42-48 Days12
208-240V Stainless Steel 4'x4' HEPA Top Side 740 to 1950 CFM 4-Pin 6601-44A-HSS-220 $4,100 42-52 Days13
277 V Stainless Steel 4'x4' HEPA Room-Side 665-1900 CFM 4-Pin 6601-44A-HR-DC $5,300 42-48 Days14
277 V Stainless Steel 4'x4' HEPA Top Side 740 - 1950 CFM 4-Pin 6601-44A-H-DC $4,100 42-48 Days15
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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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Available Accessories
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Product Details
Product Details
  • Available Certified ISO Grade Designs: ISO 5, ISO 6, ISO 7, ISO 8
  • Backward inclined blower wheel for efficiency in airflow performance
  • Finger guard protected inlet to protect users and the equipment
  • Electronically commutated motor (EC) offers quiet, reliable operation with minimal energy consumption
  • HEPA and ULPA configurations accommodate diverse cleanliness requirements
  • MODBUS® networking control card with closed-loop control capability

• Unit of Measure: of 1

Show more

Fan Filter Units

  • HEPA filters prevent infections HEPA Filters Prevent Infections
  • Portable HEPA Filtration System Watch Terra's Portable HEPA Filtration System Video
HEPA filters prevent infections
HEPA filters capture and mitigate airborne particles that can cause infections. HEPA Filters Prevent Infections HEPA and ULPA filters capture and mitigate airborne particles, as well as pathogens including Rhinoviruses, Influenza, SARS-CoV-2, and RSV. Filters also combat aerosolized bacteria like C. Difficile, a prevalent cause of hospital-acquired infections.
Portable HEPA Filtration System
Terra's in stock portable HEPA filtration systems provide high quality and medical grade air filtration for your ambient environment. Watch Terra's Portable HEPA Filtration System Video The mobile/ self contained filtration system converts to any room to a negative pressure isolation room which then makes it well suited for medical clinics, schools, waiting rooms and other confined areas.
Features & Benefits

Features and Benefits

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.

Wide Selection of Global Shipping Options

Terra offers a broad range of global shipping services including door-to-door and white glove delivery. Each product is safely packaged in a heat-treated wooden crate that meets international shipping standards.

Catalog of CE-Marked Products

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

Products Compliant With Your ISO Rating

High-capacity, durable, ISO-compliant system rated for thousands of operating hours.
Available Accessories
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
  • Energy-Efficient LED Lighting Panels

    Energy-Efficient Lighting

    Energy-efficient LED lighting panels and strips help to lower electrical costs and minimize heat build-up in temperature-controlled environments.
  • Power Distribution Modules for Cleanroom FFUs, Lights

    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 Installed on Cleanroom Fan/Filter Unit

    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 Swtich for Clean Room Fan Filter Units

    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 for Fan Filter Unit

    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).
  • Fan Filter Unit Power Cord Adapter

    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.
  • Fan Filter Unit Mounting Frame, for Ceiling Installation

    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

    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.
  • ceiling cover panels to help spray down cleanroom ceilings

    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).
  • Horizontal laminar flow wall module with 2 HEPA fan filter units mounted on a base stand

    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.
  • 2’x2’ replacement filter for roomside replaceable (RSR) Fan Filter Unit (FFU), inside view
    Learn More

    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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  22. 2'W x 4'D LED panel mounted in Terra Universal Cleanroom | 3800-41 displayed
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  23. Be prepared! Don't get left in the dark. Emergency lighting panels give you enough time to get to safety or to work through a minor power interuption. | 3800-47A displayed
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  24. Cleanroom control panel provides centralized control and monitoring of cleanroom functions; status indicator LED blinks when FFU filters need replacement | 6600-23A-NS displayed
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  25. Cleanroom control panel with built-in Tier 4 touchscreen console; datalogging (pressure/temp/RH) and FFU control for up to 16 rooms, 200 FFUs | 6607-04 displayed
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  26. Holds fan filter units secure in rigid ceilings without a T-bar grid. | 6604-00 displayed
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  27. Lightweight 6-channel airborne particle counter with a sensitivity range from 0.2- 2.0 μm; ideal for spot-checking critical environments and cleanrooms
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  28. Filter alarm enclosure with PLC features a digital touchscreen display, buzzer bypass switch, and conduit fittings for complete filter status monitoring | 2625-54C-SS displayed
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Manuals & Resources
Manuals & Resources

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  • 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.