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Smart Fan Filter Unit with electrically commutated motor for quiet, energy-efficient, remotely controlled operation | 6601-22-H-EC displayed
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Fan Filter Unit; Smart® ECM, 2'x3', ULPA, 120/240 V, Stainless Steel, WhisperFlow, BioSafe®

Terra Part #: 6601-23A-USS-EC
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 5, ISO 6, ISO 7, ISO 8

• Type: Smart® ECM

• Material: Stainless Steel

• Filter Replacement Access: Top Side

• Size: 2'x3'

• Filter Frame Material: 304 Stainless Steel

• Filter: ULPA

• Motor Type: Electronically Commutated (EC)

• Motor HP: 1/3 hp

• Airflow: Positive Pressure

• Speed Control: Variable Speed Control Card

• Blower Type: Forward Curved

• Active Filter Face Area: 5.2 ft²

• Pre-Filter: MERV 7

• Certified ISO Grade Design: ISO 5

• ISO Rated Air Cleanliness: ISO 4

• RoHS: Compliant

• Unit of Measure: EA

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Stocked CE Mark Logo ULus Listed WhisperFlow BioSafe classic logo ISO 5 Icon Quick Ship +
Terra Part #: 6601-23A-USS-EC
Manufactured By: Terra Universal
Warranty: 1 year parts, 90 days labor
LTL freight shipment. Dock or liftgate may be required.
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6601-23A-USS-EC
Terra Part # 6601-23A-USS-EC
$3,071
*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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Fan Filter Unit; Smart® ECM, 2'x3', ULPA, 120/240 V, Stainless Steel, WhisperFlow, BioSafe®
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Details & Specs
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Product Details
  • Available Certified ISO Grade Designs: ISO 5, ISO 6, ISO 7, ISO 8
  • Performance Data and Submittals
  • Customer must determine if filter system leakage testing is required for this application.  This unit is not full seam-welded.  If a leak test is required, full-body seam-welded units designed to meet ISO 14644-3 leak-testing requirements are available.
  • Ships in 120V configuration. Can be easily be reconfigured to 230V
  • Ultra-Low Particulate Air (ULPA) Filter: 99.999% efficient at 0.12µm particle diameter
  • All-304 stainless steel BioSafe® housing, baffle plate, filter face grille, filter frame and impeller ensure optimal cleanliness and stand up to alcohol and other cleaning agents
  • Electronically commutated (EC) brushless motor with internal microprocessor
  • EC motor offers high performance, low energy consumption & low noise levels (40 dB)
  • Can be incorporated into Building Management Systems (BMS) to allow remote monitoring and control
  • MODBUS® networking control card with closed-loop control capability that supports air pressure, air flow, and particle count sensors
  • Motor control panel includes diagnostic indicator lights, manual speed adjustment, test probe jacks, CAT5e ports, control mode switch, and MODBUS® address DIP switch bank
  • FDA-approved silicone sealant
  • Internal baffling plate and diffuser panel provide quiet uniform air flow across the filter face
  • 1/4-20 UNC threaded inserts on corners to allow suspension by guy-wires
  • MERV 7 pre-filter, 30% ASHRAE rated
  • Low-profile design is ideal for cleanrooms with limited ceiling space
  • Removable yellow power cord with 4-pin connector for 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)
  • Filters are leak tested in accordance with IEST standards and meet UL 900
  • See performance data and submittal sheets for additional information
  • Optional Accessories:
  •           Challenge port kit
  •           Power plug adapter
  •           Stainless surface mount frame for installing FFU in ceiling without T-grid
  •           12" ducted inlet connection adapter
  •           Replacement filter
  •           Filter replacement alarm
  •           Eye bolt package
  •           Ionizing bar
  •           Pre-filter safety cover, for CE conformance
  •           Control panel with night mode switch and power distribution modules
  • 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: Smart® ECM

• Material: Stainless Steel

• Filter Replacement Access: Top Side

• Size: 2'x3'

• Filter Frame Material: 304 Stainless Steel

• Filter: ULPA

• Motor Type: Electronically Commutated (EC)

• Motor HP: 1/3 hp

• Airflow: Positive Pressure

• Speed Control: Variable Speed Control Card

• Blower Type: Forward Curved

• Active Filter Face Area: 5.2 ft²

• Pre-Filter: MERV 7

• Certified ISO Grade Design: ISO 5

• ISO Rated Air Cleanliness: ISO 4

• RoHS: Compliant

• Unit of Measure: EA

• Marks & Listings: CE, UL, ULC

• Electrical Specifications: 120/240 V, 4.1 A, 600 W, 1 Ph, 1 Ph

• Weight, Product: 53 lb

• Dimensions, Product: 23.63" W x 35.63" D x 13" H

• Weight, Shipping: 82 lb

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

• Package Type: Palletized

Show more
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  1. ULPA Replacement Filter for FFU, with durable stainless steel frame to improve corrosion resistance | 6601-28-S displayed
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    $1,285
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Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
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

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

Gel-Filled Channel on Room-Side Replaceable Filter

Gel-filled channel on room-side replaceable filter forms a tight seal against knife edge on fan housing, allowing fast, simple filter replacement from inside the cleanroom without the need for costly cleanroom shut-down.

Full Range of Designs, Configurations!

WhisperFlow FFUs come in all styles: room-side replaceable, all-stainless steel, HEPA or ULPA filtration, EC energy-saving fans, reverse flow and more (shown: vapor filtration module with UV sanitation lamp).

Smart Fan Filter Unit with EC Motor

Smart WhisperFlow® Fan Filter Units are quiet, energy-efficient and easily adjustable, either manually or via automatic smart console, for centralized fan speed control and cleanroom pressure balancing.

Catalog of CE-Marked Products

Terra offers over 1,700 CE-marked products configured for international voltage requirements

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High-capacity, durable, ISO-compliant system rated for thousands of operating hours.
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
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    Filter Integrity and Performance Certification
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    FasTrak 24-7 Expediting Service
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    Warranty; 2 Year, Fan Filter Units, Parts
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    Service, ISO Grade Certificate, ISO 5
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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.