Air Conditioning Modules — Modular Clean Room Accessories

Terra recommends three options for air conditioning in hardwall cleanrooms.

1. Use of Existing HVAC System
   An existing high-volume air conditioning (HVAC) system provides the most effective and economical means to cool your modular cleanroom.
   
   Because filter/fan units (FFUs) draw air from the surrounding room, they pass cooled air directly into the cleanroom without the need for ducting or special exhaust systems. The additional load on an existing HVAC system can be calculated by adding the heat dissipated by the specified number of FFUs (@ approximately 1,000 BTU/hour/unit) and by equipment and personnel inside the cleanroom.
2. Air Conditioning Modules
   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 and well as any existing HVAC system.
   
   For most efficient operation, exhaust ducts and ventilation fans should be installed to vent heat outside the facility.
3. Auxiliary Central Air System
   In large modular cleanrooms, an external central A/C system is preferable to the A/C modules. In such applications, Terra will provide a ducting and recirculation system that routes exhaust air to the A/C system and delivers cooled feed air to the ceiling FFUs in ample volume to maintain the desired air velocity inside the enclosure. In addition, Terra will work with a local A/C contractor to connect this recirculation system to a central air unit that meets cooling requirements and local codes.

Call Terra to discuss the most economical, efficient air conditioning solution for your application.

Cleanroom Air Conditioning Module

• Ideal for ensuring the comfort and productivity of garbed personnel
• External air baffles allow quick, easy control over percentage of recirculated/make-up air
• Models with humidity control maintain steady RH level
• Low noise and vibration levels

Terra's HVAC modules maintain the narrow temperature range required by garbed personnel and sensitive equipment inside a modular cleanroom.

Each A/C unit is mounted to a polypropylene plenum chamber installed on the exterior cleanroom wall. An intake manifold inside the cleanroom allows recirculation of filtered air. An adjustable baffle mounted outside the cleanroom lets you adjust the percentage of fresh make-up air. Cooled air is directed into the filter/fan units for filtration before being introduced into the cleanroom.

Selection Guide
Choosing the proper A/C unit for your application requires close attention to the following operating variables: number of filter fan units, heat generated by process equipment and personnel, and air temperature outside the cleanroom. Call Terra for assistance in selecting the appropriate A/C module for your application.