Stainless Steel WhisperFlow^® Fan/Filter Units (FFUs)

Stainless Steel Fan/Filter Unit, showing power cord that connects to Power Distribution Module.

Models below are UL and UL-Canadian listed. CE marked models available; inquire when ordering

Optional Challenge Port simplifies leak testing

• BioSafe^™ 304 stainless steel housing meets requirements for cleanliness and chemical compatibility
• Internal baffling plates and diffuser panel provide uniform air speed across the filter face, ensuring laminar airflow
• Low-profile design allows cleanroom installation inside rooms with standard 9-foot (2743 mm) ceilings
• Quiet, low-vibration design: only 50 dBA, measured 30" (762 mm) from filter face @ 90 FPM (0.5 m/s)
• Provides an average airflow velocity of 90+ feet per minute (.45+ m/sec) and airflow of 640+ CFM (1088 m³/hr) under filter load at 100% medium setting (2' x 4', 610 mm x 1219 mm, model)
• Three-setting switch simplifies air balancing (see below for EnergySaver Remote Control System)
• Meets IEST Recommended Practices
• Refer to the Application Guidelines for recommendations on quantities to meet specified requirements for cleanliness and lighting.

These reliable, self-powered Fan/Filter Units provide a uniform flow of microfiltered air to meet cleanliness standards down to Class 10 (ISO 4).

All models use a 3-setting (hi/med/lo), centrifugal-type fan/motor with permanently lubricated bearings mounted inside a stainless steel housing with drop-in prefilter (stainless steel available). The HEPA or ULPA filter is mounted in a 304 stainless steel frame with stainless steel filter face grille; powder coated housing is available.

Advanced baffling technology ensures uniform airflow across the filter face and attenuates sound. Select HEPA (High-Efficiency Particulate Air) filters, rated 99.99% efficient at removing particles ≥ 0.3 microns, or ULPA (Ultra-Low Penetration Air) filters, rated 99.9995% efficient at removing particles ≥ 0.128 microns. They provide years of no-maintenance, 24/7 operation, depending on your air quality.

All prices below include installation on a specified Terra modular cleanroom.

FFU Accessories

This optional module monitors the efficiency of the HEPA filters and alerts personnel when the HEPA filters need to be replaced.  The module's Photohelic gauge connects to the nearest Fan/Filter Unit equipped with a Challenge Port (Part # 6601-99) and displays the backpressure created within the FFU.

As the HEPA filter accumulates particles over its lifetime, pressure builds in the space between the blower and the HEPA filter.  The Photohelic gauge features two manually adjustable needles that are used to mark the original backpressure reading and the maximum acceptable level (which is typically double the backpressure reading of a new filter). When the backpressure exceeds this set limit, the LED indicator light located above the gauge will flash and a buzzer will sound, notifying personnel that the room's HEPA filters should be replaced. An override switch silences the buzzer, but the light continues to flash until the filter is replaced.

If a HEPA filter accumulates too many particles and becomes clogged, it can result in a loss of efficiency that can compromise the cleanroom's ISO rating.  If they are not replaced in a timely manner, severely clogged filters can destroy the motors in the Fan/Filter Units and potentially pose a fire hazard in the event of catastrophic electrical failure.

Eliminates surface charges generated by laminar flow for a cleaner cleanroom

IonBar™ Ionizing Bar with FFU Installation Kit

The IonBar generates a balanced stream of positive and negative ions to neutralize surface static charges, protecting sensitive parts against ESD and eliminating surface attractions that make cleaning difficult. Its low-voltage design is intrinsically safe and minimizes EMI/RFI. Includes installation kit for easy attachment to fan/filter units (order separately), which disseminate ions throughout the cleanroom.