Terra Part # 6601-24B-HDR-AD
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Laminar Flow Diffuser with HEPA Filter, Ducted, RSR, Adjustable Damper, 2'x4', WhisperFlow
Product Details
  • Available ISO Ratings: ISO 5, 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
  • Unit includes specialized HEPA filter allowing for damper adjustment without filter removal
  • Allows users to seal duct before changing filter
  • 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
  • Terminal diffuser supplies cost-effective HEPA-filtered air into ISO-rated cleanrooms
  • Includes 12"-diameter x 2"H collar for secure connection to air supply duct
  • Diffuser unit includes white mesh filter grille
  • 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: factory tested and rated 99.99% efficient HEPA, for particles of 0.3µm in diameter or larger
  • Lightweight for easy installation
  • 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

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

ISO Class: 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

Manuals & Resources
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  1. Provides a stream of static-neutralizing ions to protect ESD-sensitive components.
    Ion Bar, 44", 8 Emitters, Uninstalled, 120 V Quick Ship+ Available In stock
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  2. 2’x4’ perforated 304 stainless steel, 12 gauge screen for room-side-replaceable fan filter unit  |  6601-64 displayed
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  3. Eyebolt with 1/4"-20 thread for lifting FFUs  |  6601-02 displayed
    Eyebolts, 1/4" - 20 thread, for FFU, 4 pack Quick Ship+ Available 570 in stock
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  4. Holds fan filter units secure in ceilings without grid.  |  6604-01 displayed
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  5. Cable Extension, PVC, 4 Poles, 5M, 22awg, 300V, straight male to straight female with close-up  |  6601-39 displayed
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  6. FFU Testing and Certification; Flow Rate and Filter integrity
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  7. FasTrak 24-7 Expediting Service
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  8. Warranty; 2 Year, Terra-Manufactured Product, Parts
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  9. Warranty; 3 Year, Terra-Manufactured Product, Parts
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  10. MERV 7 pre-filter for Terra Fan Filter Units (FFUs)  |  6601-34 displayed
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  11. Roomside replaceable challenge port filter provides an optimized method for filter leak testing
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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

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.
  • 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.
  • Filter Unit Mounting Frame; Stainless Steel, 2' x 2'

    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).
  • 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).
  • 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.

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.