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2' x 4' fan filter unit with HEPA filter and energy-efficient, smart EC motor with network connection for cleanrooms | 6601-PP-71 displayed
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Product Group:
6601-PP-71
6601-PP-71

Constant Airflow Fan Filter Units

Manufactured By: Terra Universal
  • Constant airflow design dynamically adjusts for changes in static pressure, filter load, and other conditions to maintain set airflow
  • Available in top-side replaceable and room-side replaceable configurations
  • Electronically commutated (EC) brushless motor provides a quieter sound level than most 2' x 4' fan filter units at 52.3 dBA
  • 90 fpm airflow up to 1.0" wg static pressure levels
  • Finger guard protected inlet to protect users and the equipment

• Unit of Measure: of 1

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Manufactured By: Terra Universal
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 Terra Part #Price Ships in
115 V Aluminum 2'x2' Room-Side HEPA, RSR Automatic Yes 140 - 350 CFM 6601-22-HR-EC-CF $2,565 30-32 Days2
115 V Aluminum 2'x2' Top Side HEPA Automatic Yes 160 - 410 CFM 6601-22-H-EC-CF $1,831 20-22 Days3
115 V Aluminum 2'x3' Room-Side HEPA, RSR Automatic Yes 200 - 500 CFM 6601-23-HR-EC-CF $2,761 30-32 Days4
115 V Aluminum 2'x3' Top Side HEPA Automatic Yes 225 - 650 CFM 6601-23-H-EC-CF $2,026 20-22 Days5
115 V Aluminum 2'x4' Room-Side HEPA, RSR Automatic Yes 240 - 610 CFM 6601-24-HR-EC-CF $2,791 30-32 Days6
115 V Aluminum 2'x4' Top Side HEPA Automatic Yes 250 - 660 CFM 6601-24-H-EC-CF $1,924 20-22 Days7
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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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*includes web discount for online orders Web-exclusive discount applies only to quotes/orders placed directly on our website; not valid for phone, email, or other ordering methods.
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Available Accessories
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Product Details
Product Details
  • Constant airflow design dynamically adjusts for changes in static pressure, filter load, and other conditions to maintain set airflow
  • Available in top-side replaceable and room-side replaceable configurations
  • Electronically commutated (EC) brushless motor provides a quieter sound level than most 2' x 4' fan filter units at 52.3 dBA
  • 90 fpm airflow up to 1.0" wg static pressure levels
  • Finger guard protected inlet to protect users and the equipment
  • Uses HEPA filter, 99.9% efficient at 0.3 micron particle size
  • Aluminum construction
  • Walkable plenum of up to 250 lbs max for easier maintenance access (top-side replaceable unit only)
  • Meets IEST recommended practices
  • RSR models feature room-side challenge ports

• Unit of Measure: of 1

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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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Manuals & Resources
Manuals & Resources

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