Terra Part # 6601-24B-HVR
$1,840
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Fan Filter Unit; Reverse-Flow, RSR, 2'x4', HEPA, 120 V, Powder-Coated Steel, WhisperFlow
  • Exhaust flow fan filter units convert any room into a negative pressure isolation/containment room
  • Filtered exhaust system also ideal for containing dust generated during maintenance or construction
  • Mounts into ceiling bay to remove sub-micron particles and provide safe exhaust
  • Medical grade filters are leak tested in accordance with IEST standards and meet UL 900
  • PSC variable speed motor provides precise, fully adjustable airflow control
  • Low-profile design is ideal for rooms with limited ceiling space.
  • 1/4-20 UNC threaded inserts on corners allow suspension by guy-wires.
  • High Efficiency Particulate Air (HEPA) Filter: 99.99% efficient at 0.3µm particle diameter.
  • Backward-curved fan optimizes airflow efficiency.
  • Removable yellow power cord with 4-pin connector provides 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).
  • Optional duct collar attachment allows connection to ducting for safe exhaust outside of room.
  • FDA-approved silicone sealant without harmful chemicals seals inside housing to prevent air leakage.
  • Room-Side Replaceable (RSR) Filters for Bag-in/Bag-out (BIBO) Replacement:
  • RSR designs allow quick and safe Bag-in/Bag-out (BIBO) filter replacement from the inside of the room for contact-free removal of filters with potentially hazardous airborne contaminants. Because it eliminates the need for roof access or breaching the cleanroom, an RSR model also greatly reduces maintenance time and related costs.
  • Gel-sealed filter seats securely against a knife-edge on the fan housing.
  • Easy-open clips allow fast filter replacement from the room side without breaching the cleanroom ceiling.
  • Filter shipped uninstalled to prevent shifting in the mounting gel that could cause leaks.
  • Dust Collector Pan:
  • Collector pan accumulates dust particles that dislodge from the HEPA filter, preventing contaminants from re-entering the cleanroom. Collector pan is easily removed for cleaning or maintenance.
  • For applications involving toxic fumes or biohazards, module seamlessly integrates with bag-in/bag-out system for safe filter disposal and replacement
  • Includes:
  • Dust collector pan
  • (1) MERV 7 pre-filter (30% ASHRAE rated)
  • See performance data and submittal sheets for additional information.
  • Optional Accessories:
  •           Power plug adapter
  •           Stainless steel surface mount frame for installing FFU in ceiling without T-grid
  •           12” ducted inlet connection adapter
  •           Replacement filters
  •           Filter replacement alarm
  •           Eye bolt package for cable suspension
  •           Control panel with night mode switch and power distribution modules
  • All filter sales are final; returns for this item cannot be accepted

Marks & Listings: UL, ULC

Electrical Specifications: 120 V, 3.8 A, 105 W, 1 Ph, 50/60 Hz

Dimensions, Product: 23.63" W x 47.63" D x 13" H

Weight, Product: 75 lb

Dimensions, Shipping: 53" W x 53" D x 20" H

Weight, Shipping: 95 lb

Package Type: Palletized

Unit of Measure: EA

Manuals & Resources

Buy Accessories
  1. 2’x4’ perforated 304 stainless steel, 12 gauge screen for room-side-replaceable fan filter unit | 6601-64 displayed
    $250
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  2. Holds fan filter units secure in ceilings without grid. | 6604-01 displayed
    $475
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  3. Simplifies filter leak testing and connection of Filter Backpressure Alarm | 6601-99 displayed
    $99
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  4. Cable Extension, PVC, 4 Poles, 5M, 22awg, 300V, straight male to straight female with close-up | 6601-39 displayed
    $80
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  5. Eyebolt with 1/4"-20 thread for lifting FFUs | 6601-02 displayed
    $25
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  6. Night service switch, shown mounted on Modular Hardwall Cleanroom panel, puts FFUs in low-energy mode during off-hours | 6601-70 displayed
    $163
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  7. Four-pin power cord adapter for fan/filter unit allows connection to standard 120VAC/60Hz power receptacle | 6601-13 displayed
    $64
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  8. Safety Cover Aluminum For CE Applications | 6601-15 displayed
    $47
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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
    $536
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  12. MERV 7 pre-filter for Terra Fan Filter Units (FFUs) | 6601-34 displayed
    $182
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Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
  • COVID-19 Contamination Control Products by Terra Universal
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.

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

COVID-19 Infection Control

Terra’s in-stock ceiling-mounted reverse-flow ducted filter fan units convert any space into a negative pressure isolation room

Dust Collector Pan Helps Prevent Contaminants from Re-Entering Cleanroom

Collector pan accumulates dust particles that dislodge from the HEPA filter, preventing contaminants from re-entering the cleanroom. Collector pan integrates with bag-in/bag-out (BIBO) systems and is easily removed for cleaning or maintenance.

Complete Project Transparency

Terra is dedicated to complete transparency on project status, shipment tracking, and installation scheduling

Wide Selection of Global Shipping Options

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

Network of International Reps

Terra employs an international network of more than 20 local sales reps trained to provide comprehensive service on Terra's complete catalog of products

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.
  • 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).
  • 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).
  • 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.
  • Stand for Cleanroom Fan Filter Unit
    Powder coated steel Fan Filter Unit stand supports up to two Fan/Filter Units for horizontal-flow applications (order FFU separately)

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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