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Mounting Position

Night Switch

ISO Class

Cleanroom Type

Terra Part # Price Ships in
24 V Control Panel External Yes ISO 7 Hardwall 6600-23C-NS 84269 $5,096 5-7 Days 2
Quick Ship+ Available In stock soon
24 V Control Panel External Yes ISO 7 Softwall 6600-25C-NS 84272 $4,906 5-7 Days 3
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24 V External Yes ISO 7 Hardwall 6600-23A-NS 78709 $4,326 5-7 Days 4
Quick Ship+ Available In stock
24 V External Yes ISO 7 Softwall 6600-25A-NS 78723 $4,136 5-7 Days 5
In stock
24 V External Yes ISO 6 BioSafe® 6600-26B-NS 83339 $4,421 5-7 Days 6
In stock soon
Mounting Position
Night Switch
ISO Class
Cleanroom Type
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Custom-configured product. Contact Terra by phone, chat or email for a project-specific quote.
Custom-configured product. Contact Terra by phone, chat or email for a project-specific quote.
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Product Details
Product Details
  • Available ISO Ratings: ISO 6, ISO 7, ISO 8
  • Cleanroom control panel provides convenient, centralized access to monitor and adjust cleanroom controls
  • Includes differential pressure gauge, power switches for FFUs and lights, and a filter replacement alarm
  • Integrated filter replacement alarm keeps your fan filter units working safely and efficiently
  • Night Service switch automatically sets FFUs to low power mode to shave 25% of energy costs
  • Upgrade to Smart® control panel for more environmental sensors and advanced control of up to 200 FFUs
  • NEC-compliant and energy-saving control system simplifies connection of power to fan/filter units (FFUs), lights, and other ceiling modules.
  • Plug-and-play modular design with quick-connect fittings speeds up installation, whether of Terra-furnished modular cleanroom or Terra cleanroom components used in your own cleanroom structure.
  • Operation Status Indicators provide simple yet effective visual confirmations of cleanroom operation.
  • Magnehelic™ differential pressure gauge (-0.25" to 0.25" WC) helps verify air pressure inside the cleanroom is at the required level to prevent cross-contamination.
  • Main power switches include tamper-resistant keys for greater safety and security.
  • Durable control panel enclosure provides a secure housing for critical cleanroom control equipment. Features an easy-to-clean mirror-finished stainless steel front cover.
  • Integrated Filter Replacement Alarm:
  • Filter replacement alarm keeps your FFUs working safely and efficiently. A single filter replacement alarm typically covers for all FFUs in the cleanroom.
  • Automatic replacement alerts help to avoid costly and unexpected operational interruptions. Also helps prevent electrical/fire hazards caused by overworked motors pushing against overloaded HEPA filters.
  • How Filter Alarm Works:
  • The alarm system connects to one FFU via a challenge port and the Minihelic™ gauge displays the backpressure of the FFU it is connected to. Assuming all FFUs are operating under the same or similar conditions, an alarm for one filter typically signals when all filters are ready to be replaced.
  • The differential pressure set-point is adjustable between 0.5" - 2" WC to modify the desired frequency of filter replacements while maintaining adequate air pressure within the cleanroom. The alarm is factory set to alert when pressure reaches twice the initial backpressure (typically 1.5" WC).
  • Audible and Visible Alarms:
  • An audible buzzer with silencer sounds when the set point is reached.  The TUI LED on the control panel also flashes when the HEPA or ULPA filter needs to be replaced.
  • Night Service Switch:
  • Night Service Switch maintains round-the-clock cleanroom integrity at lower cost by reducing power consumption during off-hours.
  • The Night Service Switch activates a separate circuit that drops all FFUs into low-energy operation mode to save 25% of fan operating costs.
  • Installation:
  • One control panel is required per cleanroom - additional units may be specified for multiple rooms or entrances.
  • Low voltage 24V control panel connects to the main Power Distribution module (PDM, sold separately) to draw power and integrate with cleanroom system.
Features & Benefits

Features and Benefits

Learn More: Control Panels and Power Distribution Modules (PDMs)

Power Distribution Module Diagram

  • PDMs house electrical components in an easy-access housing that makes it easy to add fan/filter units or lights if requirements change
  • Control Panel with Operation Status Indicators provides convenient access to all controls and a visual confirmation of cleanroom operation
  • Plug-and-play, modular design speeds up installation, whether of Terra-furnished modular cleanroom or Terra cleanroom components used in your own cleanroom structure

Terra’s Power Distribution Modules (PDMs) dramatically simplify connection of fan/filter modules (FFUs) and ceiling lights, while providing low-voltage power for one or more Control Panels

Each PDM accommodates up to 5 lights and 5 FFUs and must be wired to a dedicated 35A fused 120V circuit or a 30A fused 240V circuit. Select among four PDM types (see configuration chart below):

UL-Listed for Highest Safety and Quality

Ensuring the safety of your employees, customers, and products is essential. Terra's UL-listed PDM's and air filtering systems are manufactured to the highest standards to reduce the risk of damage, injuries, and electrical hazards such as electric shock and fires. UL (Underwriters Laboratories) is recognized around the world as the leader in product safety testing and certification. The UL listing helps meet municipal and other permitting requirements that may be required before a cleanroom can be approved for operation. It ensures safety and integrity of high voltage cleanroom electrical system, as evaluated by independent third-party UL.

Power distribution module for modular cleanroom
Quick-Connect Cleanroom Component Fittings
Leave Room for Growth!

If there’s chance that you may require additional FFUs to accommodate cleaner conditions, leave each PDM below its maximum FFU capacity. FFUs and lights can be added at any time, with no need for an electrician or hard-wiring, as long as the maximum of five of either module per PDM is not exceeded.

Electrical diagram for power distribution modules used on a cleanroom

Control Panel
Cleanroom control panel with touchscreen and automated environmental monitoring and control
  • Provides centralized control and monitoring of cleanroom functions
  • Typically mounted at the main entry of the cleanroom
  • Optional Night Service Mode switches FFUs into low-energy mode during off-hours to lower operating costs without shutting down the cleanroom.
  • Can be upgraded to Smart Control System for added environmental sensors and FFU control to meet critical performance/monitoring requirements.
Filter replacement alarm
Filter replacement alarm system with minihelic gauge and yellow power cable
  • Helps avoid unexpected and costly cleanroom operational interruptions by automatically alerting for cleanroom filter replacements
  • 1 Filter Replacement Alarm can cover for all Filter Fan Units (FFUs) in the cleanroom
  • Provides both audible and visual alarm
    • Audible: Buzzer with silencer
    • Visual: TUI Logo flashes
  • Includes adjustable alarm set-point to adjust frequency of filter replacement based on backpressure within a FFU
  • Typically mounts next to the cleanroom control panel
  • Connections:
    • Power: power connects to either the cleanroom’s power distribution module, or to a standard 120V/220V outlet
    • Pressure: ¼” plastic tubing connects from the alarm unit to one FFU
Night Service Switch
Night Service Swtich for Clean Room Fan Filter Units
  • Energy-saving mode saves 25% of fan operating costs by reducing power consumption during off-hours
  • Maintains round-the-clock cleanroom integrity at lower cost
  • Easy to activate via panel-mounted switch (Wireless Cleanroom Control System also available)
Why Pay More for Less?

Terra cleanrooms are designed to meet a specified ISO cleanliness rating when a cleanroom is in use: with operations in progress, process machinery humming, and personnel in motion. So why pay to maintain that level of FFU performance when a production shift ends and people, the greatest source of contamination, leave the room?

With a greatly reduced contaminant load, a cleanroom at rest maintains its target ISO cleanliness standard with much less airflow, fewer air changes—and decreased power consumption. Terra’s Night Service Switch provides this cleanliness at a nominal cost, giving you immediate cost savings.

Simply select the “Night Service” Switch when you turn off the lights and go home. A separate operation circuit drops all Fan/Filter Units (FFUs) into low-energy operation mode, shaving 25% of energy costs off your power bill while maintaining uninterrupted cleanroom performance at your specified cleanliness level. With Terra's Night Service Switch, operators can save up to 7,000 kilowatt-hours per year with a return on investment in slightly over a year.*

Ordering Information

A complete system includes fan/filter units and Terra's standard Power Distribution Modules (order separately), in addition to the units specified below. The Night Service Switch includes electronic configuration of each FFU controlled by this system. The Control Panel includes switch settings and indicator lights for Normal Mode and Night Service Mode, as well as a tamper-resistant master FFU Off switch.

Comparative Specifications
Operating Setting: High Speed** Medium Speed** Night Service
Airflow: cfm (m^3/hr) 808 (1373) 717 (1218) 654 (1111)
Air Speed: ft/m (m/s) 115 (0.58) 102 (0.51) 93 (0.47)
Run Amps (Watts): 4.3 (512) 3.5 (416) 3.3 (393W)*

*25% savings over operation on high speed

**Based off of an average-sized cleanroom with 10 FFUs, active cleanroom usage of 8 hours per day, and the U.S. Energy Information Administration's given average retail price of electricity at 10.72 cents per kilowatt-hour.

Quick-Connect Fittings

FFUs and lights can be easily added as cleanrooms requirements change, or disconnected for maintenance, without the need to run additional power lines or involve an electrician.

Highest Standards For Electronic Components

Terra’s electronic components are designed and built to the highest standards required by defense and semiconductor industries for long-term reliability and protection against damage, injuries, and electrical hazards.

Cleanroom Control Panel

Cleanroom Control Panels are typically mounted at the main entry of the cleanroom (custom model shown with Digihelic® room pressure gauges and thermo-hygrometers).

Operation Status Indicator Light

Modular Cleanrooms include a status indicator light in each corner, which glows when fan/filter units are operating and blinks when they are inactive.

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.

Continuous Product Improvement

At Terra, we strive to develop and produce the highest quality products for our customers to improve health, safety, performance, and yields. Our product quality is enabled by high-grade manufacturing equipment and processes, 45 years of engineering and application expertise, and our commitment to continuously improve.

Products Compliant With Your ISO Rating

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