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Filter Replacement Access

PriceUsually Ships inStocked
120 VPowder-Coated Steel2'x2'ULPARoom-Side $2,63710-14 Days
120 VPowder-Coated Steel2'x2'ULPATop Side $2,1881-3 Days Stocked
120 VPowder-Coated Steel2'x3'ULPARoom-Side $2,63710-14 Days
120 VPowder-Coated Steel2'x3'ULPATop Side $2,1881-3 Days Stocked
120 VPowder-Coated Steel2'x4'ULPARoom-Side $2,63710-14 Days
120 VPowder-Coated Steel2'x4'ULPATop Side $2,4061-3 Days Stocked
240 VPowder-Coated Steel2'x2'ULPARoom-Side $2,82210-14 Days
240 VPowder-Coated Steel2'x2'ULPATop Side $2,37510-14 Days
240 VPowder-Coated Steel2'x3'ULPARoom-Side $2,82210-14 Days
240 VPowder-Coated Steel2'x3'ULPATop Side $2,37510-14 Days
240 VPowder-Coated Steel2'x4'ULPARoom-Side $2,82210-14 Days
240 VPowder-Coated Steel2'x4'ULPATop Side $2,37510-14 Days


  • Accelerates parts drying following cleaning and sterilization
  • Unique baffling and sound-deadening, ensure uniform face velocity and ultra-quiet operation
  • 304 stainless steel diffuser grille provides an easily sterilized surface
  • Heated fan filter units provide micro-filtered air meeting standards to ISO 4 (Class 10)
  • Room-Side Replaceable models allow fast filter replacement without the need for special tools
  • Ideal for biocompatibility testing or other processes at elevated temperatures
  • 304 stainless steel diffuser grille provides an easily sterilized surface
  • ULPA filter 99.999% efficient
  • Heating element mounted inside the FFU housing that heats air up to 100 degrees Fahrenheit.
  • All FFU data is based on a standalone unit using 1” prefilter and clean filters.
  • Data will vary depending on filter media and configurations with other products/systems, such as ductwork or hoods.


Unit of Measure: of 1


Fan Filter Units

  • Terra Universal WhisperFlow® Filter Fan Units Terra Universal WhisperFlow® Filter Fan Units
  • Heated Room Side Replaceable Fan Filter Units (FFUs) Heated Room Side Replaceable WhisperFlow® Fan Filter Units (FFUs)
Terra Universal WhisperFlow® Filter Fan Units

Features and Benefits

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.

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

Website Metric Conversion Tool

Easily convert any product specification to metric units of mesure using Terra's web-based metric conversion tool

Network of International Reps

Terra employs an international network of more than 20 local sales reps trained to provide comprehensive service on Terra's complete catalog of products
Popular Accessories
For a full list of accessories, select a product then click Choose Accessories on that product page.
  • Energy-Efficient Lighting

    Energy-efficient LED lighting panels and strips help to lower electrical costs and minimize heat build-up in temperature-controlled environments.
  • 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.
  • Ionizing Bar; 22"L, with Installation Kit, for 24 x 24 Fan/Filter Unit

    Ionizing bar, mounted to Fan/Filter Unit, provides a balanced stream of ions to the work area below to neutralize static charge and prevent electro-static discharge; 22" bar shown installed on 2' x 2' FFU.
  • FFU Mounting Frame; Stainless Steel

    Stainless steel Fan Filter Unit (FFU) mounting frame supports FFU on drywall or other rigid ceiling material, viewed from above ceiling panel (FFU not included).
  • Night Service Saves Energy, Extends Filter Life!

    Night service switch, shown mounted on Modular Hardwall Cleanroom panel, puts FFUs in low-energy mode during off-hours; saves 25% of fan operating costs and extends filter life.
  • 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).
  • Fan Filter Unit Control System

    Provides room-by-room monitoring and control of Smart WhisperFlow FFUs to maintain target pressure differentials for ISO classification; temperature, humidity and particle monitoring and data logging, as well as dynamic fan set-point control, also available.
  • Power Distribution Modules for Cleanroom FFUs and Lights

    UL-listed power distribution modules include all breakers, transformers and other electrical components for FFU/light connections; allows fast addition or relocation of FFUs or lights without the need for rewiring.
  • 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).
  • 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.
Manuals & Resources
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