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Ducted terminal diffuser provides uniform flow of HEPA-filtered air to an enclosure (requires remote air handler) | 6601-24-HD 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; WhisperFlow®, 2'x4', Activated Carbon, 12" Duct Collar

Terra Part #: 6601-24-CD
Manufactured By: Terra Universal
Warranty: 1 year parts, 90 days labor
LTL freight shipment. Dock or liftgate may be required.
  • Available Certified ISO Grade Designs: ISO 6, ISO 7, ISO 8
  • Suitable for industries requiring frequent use of solvents and volatile organic compounds (VOCs)
  • Honeycomb activated carbon-equipped laminar flow housing specialized for containing odorous contaminants
  • Economical filter unit includes internal baffling and diffuser panel for quiet, uniform air flow
  • Gas-phase filtration absorbs gaseous material at the molecular level too small for HEPA filters to capture
  • Filter adsorbs up to 7.5lb (3.4kg) of VOCs including fumes, odors, and other pollutants.

• Type: Ducted

• Material: Powder-Coated Steel

• Filter Replacement Access: Top Side

• Size: 2'x4'

• Filter Frame Material: 304 Stainless Steel

• Filter: Activated Carbon

• Motor Type: None

• Airflow: Positive Pressure

• Special Application: Vapor-Removal & Sanitizing

• FFU Type: Ducted

• Pre-Filter: None

• Certified ISO Grade Design: ISO 6

• Voltage: None

• Unit of Measure: EA

Read more
Stocked WhisperFlow ISO 6 Icon
WhisperFlow
Terra Part #: 6601-24-CD
Manufactured By: Terra Universal
Warranty: 1 year parts, 90 days labor
LTL freight shipment. Dock or liftgate may be required.
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6601-24-CD
Terra Part # 6601-24-CD
$581
*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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Laminar Flow Diffuser; WhisperFlow®, 2'x4', Activated Carbon, 12" Duct Collar
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Product Details
  • Available Certified ISO Grade Designs: ISO 6, ISO 7, ISO 8
  • Suitable for industries requiring frequent use of solvents and volatile organic compounds (VOCs)
  • Honeycomb activated carbon-equipped laminar flow housing specialized for containing odorous contaminants
  • Economical filter unit includes internal baffling and diffuser panel for quiet, uniform air flow
  • Gas-phase filtration absorbs gaseous material at the molecular level too small for HEPA filters to capture
  • Filter adsorbs up to 7.5lb (3.4kg) of VOCs including fumes, odors, and other pollutants.
  • Activated carbon filters capture common odor-causing substances including ammonia, hydrogen sulfide, ozone
  • Includes 12"-diameter x 2"H collar for connection to air supply; Airflow performance depends on flow of supplied air handler
  • 1/4-20 UNC 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 FFU is ordered)
  • Purchase optional Challenge Port Kit separately
  • Activated Honeycomb Carbon:
  • Provides effective odor control and particle filtration in critical environments.
  • Made from high-quality, virgin coconut shell for superior pore size distribution and maximum adsorption capacity.
  • Effectively removes volatile organic compounds (VOCs) like carbon tetrachloride, trichloroethane, and ethylbenzene.
  • Designed for high performance and low particulate shedding, these bonded carbon panels eliminate the need for downstream filters, unlike loose-fill carbon trays or disposable honeycomb filters.
  • Suited for HVAC systems in critical environments.
  • NOTE:
  • Customer must determine if filter leak testing is required for their application. This unit is not leak rated. If a leak test is required, units leak-tested to meet ISO 14644-3 are optionally available.
  • All filter sales are final; returns cannot be accepted due to the sensitive nature of HEPA filters. Leak tested filters may qualify for limited replacement if a defect is identified upon delivery.

• Type: Ducted

• Material: Powder-Coated Steel

• Filter Replacement Access: Top Side

• Size: 2'x4'

• Filter Frame Material: 304 Stainless Steel

• Filter: Activated Carbon

• Motor Type: None

• Airflow: Positive Pressure

• Special Application: Vapor-Removal & Sanitizing

• FFU Type: Ducted

• Pre-Filter: None

• Certified ISO Grade Design: ISO 6

• Voltage: None

• Unit of Measure: EA

• Electrical Specifications: None

• Weight, Product: 71 lb

• Dimensions, Product: 23.63" W x 47.63" D x 11.17" H

• Weight, Shipping: 91 lb

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

• Package Type: Palletized

Show more
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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
6601-PP-08

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).

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

Stainless Steel Frame, Grille, and Mesh

Carbon filter features a sanitary, sterile stainless steel frame and grille contain compressed activated carbon media with the aid of a fine mesh

VOC-Adsorbing Activated Honeycomb Carbon Filter Media

High quality compressed activated honeycomb carbon features a low wind resistance and strong adsorption capacity to filter fumes, odors, and other contaminants.

High Throughput Activated Carbon Channel Grid

Honeycomb carbon media structure creates high efficency adsorpiton without sacrificing airflow due to constrictive fiber meshes.

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

Products Compliant With Your ISO Rating

High-capacity, durable, ISO-compliant system rated for thousands of operating hours.
Popular Accessories
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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.