Explosion-Proof Reverse-Flow FFUs isolate and contain electrical components to safely exhaust combustible powders | 6601-22-UVFSS displayed

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Explosion-Proof Fan Filter Units, Reverse Flow

Available ISO Ratings: ISO 5, ISO 6, ISO 7, ISO 8
Exhaust flow fan filter unit convert any room into a negative pressure isolation/containment room
Explosion-proof FFU meets NEC requirements for Class I/Class II, Division 1 Hazardous locations
Non-sparking motor, mounted in a cast-iron, explosion-proof housing
Mounts into ceiling bay to remove sub-micron particles and provide safe exhaust
Minimize cleanroom service downtime with room-side-replaceable (RSR) fan filter units

Manufactured By: Terra Universal

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Here at Terra Universal, we’ve made it our mission to offer the best possible lead times in the industry. In addition to aggressive stocking programs and streamlined fulfillment, Terra Universal also offers several services that ensure you receive your products as quickly as possible.

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FasTrak 24/7 guarantees to meet the shipping date YOU specify, regardless of quoted lead times.

Terra Universal can provide FasTrak 24/7 service for both in-stock products and custom orders.

Examples of FasTrak 24/7 services include:

Assigning a dedicated senior expediter
Assigning a dedicated production team and up to three shifts per day
Eliminating internal purchase approvals to speed the receipt of parts and materials

Terra FasTrak service fees are only meant to cover the cost of additional Terra services, they are not designed to generate profit. If Terra fails to ship on or before the specified date, Terra will refund up to 100% of the FasTrak charges at the client's request. This guarantee does NOT cover direct, special, consequential, or other damages. It is strictly limited to 100% of the amount paid for the FasTrak service.

The FasTrak 24/7 refund policy does not apply when a specified ship date is missed due to factors outside Terra's control, such as vendor performance or shipping company delays. The FasTrak 24/7 guarantee DOES apply in instances where the shipping date is missed due to Terra's own negligence.

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The Quick Ship Plus service is available for orders of in-stock, turnkey products that do not require any additional assembly before shipment. This service guarantees that the order will be delivered on or before the date indicated, or the charges for the Quick Ship Plus service will be refunded in full upon the client's approved request.

This guarantee does not cover any direct, special, consequential, or other damages, and is strictly limited to 100% of the amount paid for the Quick Ship Plus service. In alignment with FasTrak programs, In the case that shipment delays arise due to factors that are within Terra's control, Terra will refund up to 100% of the Quick Ship Plus fees. This guarantee does NOT cover direct, special, consequential or other damages and is strictly limited to 100% of the amount paid for Quick Ship Plus service.

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Terra's QuickBuild Program includes dozens of products with stocked components ready for quick assembly and shipment in 5 days.

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Quick Build services are available for Terra products assembled with in-stock, on-hand components. Therefore, Terra can provide these items assembled and ready for shipment within 4 - 6 business days.

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Voltage All 120 V 120/240 V Sort Order: Descending Ascending	Material All Stainless Steel Sort Order: Descending Ascending	Size All 2'x2' 2'x3' 2'x4' Sort Order: Descending Ascending	Filter All ULPA Sort Order: Descending Ascending	Filter Replacement Access All Room-Side w/ Dust Collector Pan Top Side Sort Order: Descending Ascending	ISO Class All ISO 4 Sort Order: Descending Ascending	Terra Part #	Price	Ships in
120	Stainless Steel	2'x2'	ULPA	Top Side	ISO 4	6601-22-UEVSS 70432	$5,803	1-3 Days	2	Only 2 left in stock
120	Stainless Steel	2'x3'	ULPA	Top Side	ISO 4	6601-23-UEVSS 70431	$5,803	1-3 Days	3	In stock soon
120	Stainless Steel	2'x4'	ULPA	Top Side	ISO 4	6601-24-UEVSS 70430	$5,803	1-3 Days	4	In stock soon
120	Stainless Steel	2'x2'	ULPA	Room-Side w/ Dust Collector Pan	ISO 4	6601-22-UEVRSS 79138	$6,167	10-14 Days	5
120	Stainless Steel	2'x3'	ULPA	Room-Side w/ Dust Collector Pan	ISO 4	6601-23-UEVRSS 79137	$6,167	10-14 Days	6
120	Stainless Steel	2'x4'	ULPA	Room-Side w/ Dust Collector Pan	ISO 4	6601-24-UEVRSS 79136	$6,167	10-14 Days	7

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Product Details

• Available ISO Ratings: ISO 5, ISO 6, ISO 7, ISO 8
Exhaust flow fan filter unit convert any room into a negative pressure isolation/containment room
Explosion-proof FFU meets NEC requirements for Class I/Class II, Division 1 Hazardous locations
Non-sparking motor, mounted in a cast-iron, explosion-proof housing
Mounts into ceiling bay to remove sub-micron particles and provide safe exhaust
Minimize cleanroom service downtime with room-side-replaceable (RSR) fan filter units

Explosion-Proof Design:

Explosion-proof motor meets NEC requirement for Class I Group C and D, Class II Group F and G, Division 1 hazardous locations.

All wiring embedded in filled, rigid conduit in accordance with Class I/II requirements.

NOTE: Proper installation of explosion proof equipment is critical to maintaining the explosion-proof protection aspects of the system. Customer must hard wire the motor/ffu in correlation to their specified voltage at time of installation. Therefore all wiring for explosion proof systems should be done in the field per local code by a licensed electrician.

FFU Design:

All-304 stainless steel BioSafe® housing, baffle plate, filter face grille, and filter frame ensure optimal cleanliness and stand up to alcohol and other cleaning agents.

Internal baffling plate and diffuser panel provide quiet uniform air flow across the filter face.

1/4 (6 mm) -20 threaded holes in top corners accommodate eyebolts to facilitate installation using suspended guy wires (order eye bolt package separately).

FDA-approved silicone sealant without harmful chemicals seals inside housing to prevent air leakage (specify acrylic urethane or other required sealant type when FFU is ordered).

ULPA Filter: 99.999% efficient Ultra-Low Penetration Air, rated at particles 0.12µm diameter, shipped uninstalled to prevent damage during shipping.

Medical grade filters are leak tested in accordance with IEST standards and meet UL 900.

See performance data and submittal sheets for additional information.

NOTE: Because filters are delicate and subject to damage during handling, all filter sales are final; no returns can be accepted.

Room-Side Replaceable (RSR) Filter 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.

Dust Collector Pan:

Collector pan accumulates dust particles that dislodge from the HEPA filter, preventing contaminants from re-entering the cleanroom. Collector pan is easily removed for cleaning or maintenance.

For applications involving toxic fumes or biohazards, module seamlessly integrates with bag-in/bag-out system for safe filter disposal and replacement.

Optional Accessories:

Stainless steel surface mount frame for installing FFU in ceiling without T-grid.

12” duct adapter for connection to safe exhaust outside of room.

Top safety cover, for CE conformance.

Replacement filters.

Eye bolt package for cable suspension.

Includes:

(1) Dust collector pan.

(1) MERV 7 filter (30% ASHRAE rated), 19.5" x 19.5" x 7/8" thk.

Fan Filter 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 & Benefits

Features and Benefits

hepa filter comparison for cleanroom fan filter units

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.

HEPA/ULPA filtration diagram with examples of filtered contaminants

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

Non-Sparking Direct-Drive Motor

Explosion-proof motors use a non-sparking polypropylene fan and cast-iron brackets attached to the heavy duty rolled steel frame

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.

Explosion-Proof Junction Box

The reinforced junction box of the explosion-proof fan filter unit is built to withstand and contain an explosive reaction within the conduit system.

Filter replacement alarm system with minihelic gauge and yellow power cable

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.

Rotating Clamps on Room-Side Replaceable Fan Filture Unit

Easy-Release Filter Clamp on Room-Side Replaceable FFU

Easy-release clamps rotate to release filter on Room-Side Replaceable Fan Filter Units, simplifying filter servicing without the need for a cleanroom shut-down.

Explosion-Proof Power Switches

UL-rated explosion-proof switches are connected to the lights and blowers using specialized conduit with potted fittings. All electrical components are sealed to eliminate potential ignition points.

Explosion-Proof Potted Fittings

Conduit is filled with an expanding cement mixture to isolate explosion-proof components from potential sources of ignition; explosion-proof fittings meet requirements of NEC for Class I, Division 1 hazardous locations.

Pre-Filter Grounding Clip

A grounding wire connects the body of the Explosion-Proof FFU to a metal wireframe embedded in the pre-filter as a safeguard against sparking.

WhisperFlow Quiet Operation Reduces Distracting Background Noise

Exposure to loud noises can lower the ability to focus on work and listen selectively, which may also lead to safety issues. Typical AC units can be annoyingly loud, measuring in the range of 70 dB (comparable to a vacuum cleaner). Terra’s WhisperFlow design produces far lower noise levels for a quiet environment comparable to a library. At 90 ft/min output, units measure under 50 dB from only 1 ft away (roughly 75% quieter than 70dB).

Product Prices Honored Worldwide

From Argentina to Zimbabwe, Terra's customers pay a single web-listed price for each product

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Easily transcribe the verbaige on Terra's website into more than 80 different languages using our website translator tool

Catalog of CE-Marked Products

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

Products Compliant With Your ISO Rating

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

Available Accessories

Popular Accessories

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

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Explosion-Proof 40W LED Light

UL-listed for Class I, Division 1 and 2, Groups C and D areas, this low profile LED light produces 3,600 lumens and operates from 120 to 277VAC, 50/60Hz. The heat-dissipating housing increases the efficiency and lifespan of the LEDs.
Explosion-Proof Power Distribution Module

Explosion-Proof Power Distribution Module (PDM) meets NEC code for a Class I/Division 1 hazardous location; includes all relays, breaks and other cleanroom electrical components
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).
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Replacement Filters

Purchase replacement filters ahead of time to prevent costly operational interruptions and avoid damage to fan blowers caused by excessive backpressure from long overdue filter replacements.