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Cleanroom Air Conditioning Systems
for Hardwall Modular Cleanrooms

Terra hardwall modular cleanroom with split A/C system: heat-generating compressor mounted on the roof, with cool air ducted to the cleanroom's fan/filter units.

Terra recommends the following options for air conditioning in hardwall cleanrooms:
  • Existing HVAC System

    The ideal option would be to use an existing heating, ventilating and air conditioning (HVAC) system because it provides the most effective and economical means to cool your modular cleanroom. The fan/filter units (FFUs) can draw air from the surrounding room, passing conditioned air directly into the cleanroom without the need for ducting or special exhaust systems. The existing ducting can also be connected directly to each FFU using a connection kit.

    Consult with an HVAC contractor to determine if the existing system has the necessary spare capacity to adequately cool the cleanroom. The additional load on an existing HVAC system can be calculated by adding together the heat dissipated by the specified number of FFUs (@ approximately 1,000 BTU/hour/unit) and the heat generated by equipment and personnel inside the cleanroom.

  • Split A/C System

    If the existing HVAC system cannot be used, the addition of a split HVAC system would be the next best option. A split system moves the heat-generating compressor outside of the facility, eliminating noise and heat build-up in the area outside of the cleanroom.

    For these applications, Terra will work with a local HVAC contractor to provide a split-type system that meets your cooling requirements and local codes. Terra will provide the ducting and recirculation system that routes exhaust air to the compressor and delivers cool air to the ceiling FFUs in ample volume to maintain the desired air velocity inside the enclosure.

  • Environmental Stability System

    For applications requiring strict temperature and humidity control (where the above options are not suitable), Terra can provide custom HVAC modules that operate similarly to an environmental test chamber, adjusting the supply air's temperature and humidity to maintain specific conditions within tight tolerances. This type of system is particularly useful when the environment immediately outside of the cleanroom experiences significant fluctuations in temperature or relative humidity.

    Typical Applications: Pharmaceutical or Medical Device Manufacturing, GMP Facilities, Testing Laboratories, High Humidity Environments

    Note: For best performance, these modules should be paired with an insulated hardwall cleanroom.

  • Standard Cleanroom A/C Module

    The modules below provide economical cooling in facilities without adequate HVAC. Based on the cleanroom size, desired temperature, and heat dissipated inside the cleanroom, Terra will configure the appropriate number of units.

    Note: In these applications, heat removed from the cleanroom is vented into the room outside. In the case of large cleanrooms and/or significant heat-generating equipment, this vented heat will raise the ambient temperature and place greater load on the A/C modules as well as any existing HVAC system. For best performance, heat generated by the module should be exhausted outside of the facility.

Call Terra Universal to discuss which air conditioning
solution is best suited for your application.

Cleanroom Air Conditioning Module
stainless steel air return
Stainless Steel BioSafe™ Cleanroom with HVAC Module No. 6704-32 and Vertical Air Return.
  • Modular HVAC units ensure comfort and productivity of garbed cleanroom personnel
  • External air baffles allow quick, easy control over ratio of recirculated/make-up air
  • Models available with humidity control maintain stable sub-ambient RH levels
  • All units include Vertical Air Return that directs the cooled air to the ceiling FFUs via either a ceiling plenum or flexible ducts

A Terra application engineer will help select the HVAC module(s) appropriate to your cleanroom, based on room size, number of FFUs, and heat load. Typically, additional Vertical Air Returns are required to provide make-up air by recirculating the cooled cleanroom air through the FFUs.

A/C Modules (includes Vertical Air Return)
All models operate on 230/208VAC, 60Hz, 1 Phase
(Net BTUH)
KW AC Control Only AC and RH Control
Cat. # Price Cat. # Price
18,000 1.5 8 6704-27 $ 4,453
48,000 4 10 6704-28 $ 5,999 6704-31 $ 9,374
57,000 5 10 6704-29 $ 8,941 6704-32 $ 11,891
Air conditioning airflow
The Vertical Air Return features removable side panels for easy cleaning of unit's interior; top baffle plate minimizes air turbulence.
Vertical Air Returns (VAR)

Each HVAC unit is mounted to a Vertical Air Return (VAR), which includes a plenum chamber mounted to the side of the cleanroom. This structure draws air from the cleanroom into the HVAC module and then directs cooled air upward to the cleanroom ceiling, where it enters either a ceiling plenum or duct manifold (see illustrations below). On BioSafe® Cleanrooms, return air is directed to the HVAC unit via ducts inside the BioSafe® panels. An adjustable baffle mounted outside the cleanroom lets you adjust the percentage of fresh make-up air.

Vertical Air Return (each services up to 3 FFUs)
  Cat. # Price
For ceilings up to 7' 6602-48 $ 2,539
For ceilings above 7' 6602-49 $ 3,176

UV-C Ductwork Sanitizers can be used to prevent the buildup of microorganisms within the air return system.

HVAC Air Return Configurations

Ductless (Ceiling Plenum)

In very large modular facilities, Terra recommends building an insulated ceiling plenum, which provides cooled return air to the fan/filter units.

Air conditioning modules are mounted to air returns, which direct cooled air upward to the plenum. Depending on the number of fan/filter units (FFUs) being serviced, additional Vertical Air Return modules may be required to ensure ample recirculated air supply to the FFUs. Adjustable baffles on the A/C modules allow some fresh make-up air to enter the system.

Air Conditioning with a Ceiling Plenum

Ducted (Direct FFU Connection)

The vertical air return attaches to ductwork that feeds the Fan/Filter Units (FFUs) positioned on the cleanroom ceiling. A single A/C module can typically feed up to three FFUs.

Additional FFUs are typically fed air recirculated from the cleanroom through Vertical Air Returns, as shown in the illustration above. Depending on the number of fan/filter units (FFUs) being serviced, additional A/C or Vertical Air Return modules may be required. Adjustable baffles on the A/C modules allow some fresh make-up air to enter the system.

Each FFU requires an FFU Connect pack, which includes flexible ducting and all hardware required to connect and seal the duct.

FFU Connect Packs

Cat. # Price
Includes ducting and mounting hardware 6601-01 $ 166
ductwork   Connect Pack
Ducting connected to a VAR   Connection point on top of FFU

File Type File Name Publication Date
White Paper (PDF) Cutting Cleanroom Costs
A few simple modifications to your cleanroom can increase efficiency, boost performance and slash operating expenses. Read about the steps you can take to optimize your controlled-environment facility.
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