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Diffuser with Room-side Adjustable Damper allows for precision control of airflow as well as allowing users to seal the FFU before changing filter | 6601-24B-HD-AD displayed
Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan Filter Units,Fan/Filter Units

Laminar Flow Diffuser with HEPA Filter, Ducted, RSR, Adjustable Damper, 2'x4', WhisperFlow

  • Available Certified ISO Grade™ Designs: ISO 6, ISO 7, ISO 8
  • Terminal diffuser supplies cost-effective HEPA-filtered air into ISO-rated cleanrooms
  • Includes adjustable air flow damper, accessed from within the cleanroom, to modulate air velocity
  • Damper screw adjustment, using a flathead screwdriver, opens or closes the damper plate to increase or reduce air flow
  • Adjustable damper units include white mesh filter grille

• Type: Ducted, RSR

• Material: Powder-Coated Steel

• Filter Replacement Access: Room-Side

• Size: 2'x4'

• Filter Frame Material: Aluminum

• Filter: HEPA

• Motor Type: None

• Airflow: Positive Pressure

• Certified ISO Grade™ Design: ISO 6

• ISO Rated™ Air Cleanliness: ISO 5

• Unit of Measure: EA

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Terra Part #: 6601-24C-HDR-AD
Manufactured By: Terra Universal
Warranty: 1 year parts, 90 days labor
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6601-24C-HDR-AD
Terra Part # 6601-24C-HDR-AD
$903
*includes online discount applied to web quotes/orders only 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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Laminar Flow Diffuser with HEPA Filter, Ducted, RSR, Adjustable Damper, 2'x4', WhisperFlow
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Product Details
  • Available Certified ISO Grade™ Designs: ISO 6, ISO 7, ISO 8
  • Terminal diffuser supplies cost-effective HEPA-filtered air into ISO-rated cleanrooms
  • Includes adjustable air flow damper, accessed from within the cleanroom, to modulate air velocity
  • Damper screw adjustment, using a flathead screwdriver, opens or closes the damper plate to increase or reduce air flow
  • Adjustable damper units include white mesh filter grille
  • Performance Data and Submittals
  • Customer must determine if filter system leakage testing is required for their application. This unit is not full seam welded. If a leak test is required, full seam welded units, leak-tested to meet ISO 14644-3 standards, are optionally available
  • Includes 12"-diameter x 2"H collar for secure connection to air supply duct
  • Airflow performance is dependent upon flow of supplied air handler
  • 1/4-20 threaded inserts in top corners accommodate eyebolts to facilitate installation using suspended guy wires (order eyebolt package separately)
  • Includes FDA-approved silicone sealant (specify acrylic urethane or other required sealant type when unit is ordered)
  • Purchase optional Challenge Port Kit separately
  • Filter: 99.99% efficient HEPA, rated for particles of 0.3µm in diameter or larger
  • Lightweight for easy installation
  • Roomside-replaceable HEPA filter prevents cleanroom shutdowns during regular filter changes
  • Filter includes aluminum frame with anodized aluminum filter face grille; all-stainless steel model available
  • Removable filter accessible from inside cleanroom for easy replacement or servicing
  • Because filters are delicate and subject to damage during handling, all filter sales are final; no failure claims can be accepted
Show more

• Type: Ducted, RSR

• Material: Powder-Coated Steel

• Filter Replacement Access: Room-Side

• Size: 2'x4'

• Filter Frame Material: Aluminum

• Filter: HEPA

• Motor Type: None

• Airflow: Positive Pressure

• Certified ISO Grade™ Design: ISO 6

• ISO Rated™ Air Cleanliness: ISO 5

• Unit of Measure: EA

• Weight, Product: 71 lb

• Dimensions, Product: 23.63" W x 47.63" D x 12.51" H

• Weight, Shipping: 91 lb

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

• Package Type: Palletized

Show more
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  1. Roomside replaceable challenge port filter provides an optimized method for filter leak testing
    Filter; HEPA, 2'x4', Aluminum, Rated 99.999% efficient, for Roomside Replaceable FFU, Roomside Challenge Port In stock soon
    $736
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  2. 500 lbs capacity on each side of fan filter unit
    Upgrade FFU to Walkable Design
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  12. MERV 7 pre-filter for Terra Fan Filter Units (FFUs)), 4 pack | 6601-34 displayed
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Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
  • 2' x 4' Ducted HEPA Filter Unit Ducted HEPA Filter Unit, 2' x 4'
Terra Universal WhisperFlow® Filter Fan Units
Overview video of Terra Universal's comprehensive portfolio of filter fan units Terra Universal WhisperFlow® Filter Fan Units Overview video of Terra Universal's comprehensive portfolio of filter fan units
2' x 4' Ducted HEPA Filter Unit
Ducted filter unit provides uniform flow of HEPA- or ULPA-filtered air to an enclosure (requires remote air handler) | 6601-24-HD displayed Ducted HEPA Filter Unit, 2' x 4' Ducted filter unit provides HEPA- or ULPA-filtered air to an enclosure (requires remote air handler). WhisperFlow baffling system ensures uniform face velocity (2 x 4 model shown).

Features and Benefits

Terminal Diffuser with HEPA Filter

Ducted terminal housing with HEPA filter provides clean airflow into cleanroom. When adjustable damper is included operator has the ability to increase/decrease airflow with a screw.

Diffuser with Room-side Adjustable Damper

Terra Universal's Diffuser with Room-side Adjustable Damper allows for precision control of airflow as well as allowing users to seal the FFU before changing filters.

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

Complete Order Transparency

Using Terra’s OnTrak system, our customers can view real-time production updates, receive shipment notifications and track their orders until they arrive at their facility

Website Metric Conversion Tool

Easily convert any product specification to metric units of measure using Terra's web-based metric conversion tool
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
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  • FasTrak 24/7 provides a 24/7 commitment to meet the shipping date YOU specify, regardless of quoted lead times.
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 * 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.