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4x4 WhisperFlow Fan/Filter Unit with brushless energy-efficient EC motor and HEPA filter for cleanroom applications
Product Group:
6601-PP-70
6601-PP-70 84921

4' x 4' Fan Filter Units

  • Available Certified ISO Grade Designs: ISO 5, ISO 6, ISO 7, ISO 8
  • Available in top-side replaceable and room-side replaceable configurations
  • 90 fpm airflow up to 1.0" wg static pressure levels
  • Electronically commutated (EC) brushless motor provides a quieter sound level than most 2' x 4' fan filter units at 52.3 dBA
  • Backward inclined blower wheel for efficiency in airflow performance
  • 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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ISO Rated™ Air Cleanliness

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Filter Replacement Access

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Full Seam Welded

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UL-Listed

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 Terra Part #Price Ships in
120 V Aluminum ISO 5 4'x4' Room-Side No Yes 665 to 1900 CFM 6601-44A-HR 84976 $3,300 42-48 Days2
120 V Aluminum ISO 5 4'x4' Top Side No Yes 740 - 1950 CFM 6601-44A-H 84971 $2,100 42-52 Days3
120 V Stainless Steel ISO 5 4'x4' Room-Side No Yes 665 - 1900 CFM 6601-44A-HRSS 85111 $5,300 42-48 Days4
120 V Stainless Steel ISO 5 4'x4' Top Side No Yes 740 to 1950 CFM 6601-44A-HSS 85107 $4,100 42-52 Days5
208-240V Aluminum ISO 5 4'x4' Room-Side No Yes 665 to 1900 CFM 6601-44A-HR-220 85103 $3,300 42-48 Days6
208-240V Aluminum ISO 5 4'x4' Top Side No Yes 740 - 1950 CFM 6601-44A-H-220 84974 $2,100 42-52 Days7
208-240V Stainless Steel ISO 5 4'x4' Room-Side No Yes 665 to 1900 CFM 6601-44A-HRSS-220 85112 $5,300 42-48 Days8
208-240V Stainless Steel ISO 5 4'x4' Top Side No Yes 740 to 1950 CFM 6601-44A-HSS-220 85110 $4,100 42-52 Days9
277 V Stainless Steel ISO 5 4'x4' Room-Side No Yes 665-1900 CFM 6601-44A-HR-DC 84617 $5,300 42-48 Days10
277 V Stainless Steel ISO 5 4'x4' Top Side No Yes 740 - 1950 CFM 6601-44A-H-DC 84616 $4,100 42-48 Days11
Voltage
Material
ISO Rated™ Air Cleanliness
Size
Filter Replacement Access
Full Seam Welded
UL-Listed
Airflow Volume
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Custom-configured product. Contact Lab Equip by phone, chat or email for a project-specific quote.
Custom-configured product. Contact Lab Equip by phone, chat or email for a project-specific quote.
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Product Details
Product Details
  • Available Certified ISO Grade Designs: ISO 5, ISO 6, ISO 7, ISO 8
  • Available in top-side replaceable and room-side replaceable configurations
  • 90 fpm airflow up to 1.0" wg static pressure levels
  • Electronically commutated (EC) brushless motor provides a quieter sound level than most 2' x 4' fan filter units at 52.3 dBA
  • Backward inclined blower wheel for efficiency in airflow performance
  • Finger guard protected inlet to protect users and the equipment
  • Uses HEPA filter, 99.9% efficient at 0.3 micron particle size
  • Aluminum or 304 Stainless Steel construction
  • Walkable plenum of up to 250 lbs max for easier maintenance access (top-side replaceable unit only)
  • Meets IEST recommended practices
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• Unit of Measure: of 1

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  • HEPA filters prevent infections HEPA Filters Prevent Infection
  • 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 Infection 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.
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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