Terra Part # 6601-24A-HVR
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• 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.


• (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: 115 V, 3.8 A, 105 W, 1 Ph, 60 Hz

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

Weight, Product: 71 lb

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

Weight, Shipping: 91 lb

Package Type: Palletized

Unit of Measure: EA

Features and Benefits

Eliminate Contaminants and Pathogens

HEPA and ULPA filters capture many bacteria, viruses, and mold spores that contribute to a host of infections for both humans and plant/animal tissue cultures

Reverse Flow FFU with Room-Side-Removable Filter

Ceiling-mounted reverse flow FFU’s are suitable for exhaust applications. They draw contaminated room air through the HEPA filter at the bottom, and exhaust at the top. A room-side removable HEPA filter allows easy service without dismounting the entire unit.

Optional Exhaust Flange for Ducting to Outside

Exhaust flow FFU easily configures for recirculation or safe exhaust. Attach an optional flange adapter to the top of the unit for connection to ducting. The ducting then re-directs filtered air outside the room.

Long Running FFU Motors

Terra’s filter fan unit motors are rated for 5 years of continuous, 24/7 operation, if the HEPA filters are consistently replaced. To accurately monitor your HEPA filter’s saturation levels, purchase Terra’s audible and visual filter replacement alarm system.

Popular Accessories

For a full list of accessories, select a product then click Choose Accessories on that product page.
  • 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)
  • 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).

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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