Modular Air Handling Systems One Air Handler can do the work of several motorized filter modules. Air Handlers not only pump cleanroom air, they also offer advanced climate control features not offered by fan filters. Optional capabilities such as air conditioning, humidifying and temperature control make air handling units better suited to precisely control your cleanroom environment. Whether you are building new, or upgrading to a cleaner climate, Air Handlers offer a wealth of performance benefits. Pull or produce room air through self-contained units Use a pre-filter to clean and a coil to condition the air Floor mounted outside the cleanroom saving valuable cleanroom floor spaceThere are two common types of cleanroom systems, single pass and re-circulating. Below is a basic overview along with a diagram model for each type. Correctly designed and engineered cleanroom airflow and air change rates are the heart of the cleanroom envelope assuring compliance with ISO, FDA, cGMP, and USP – 797 regulatory standards.

They also greatly impact operational and maintenance cost and requirements upon completion of the ISO Class cleanroom environment depending on which type may be right for your application and the environment where the system will be located. Besides particulate levels, airflow and air changes rates will ultimately determine the temperature, relative humidity, heat load, static, and gradients of all depending on the percentage of treated conditioned air introduced, number of times air is changed, and total heat load of the cleanroom environment including personnel, process equipment, lighting levels, and type of HEPA filtration modules utilized. Please be sure to check with one of our cleanroom specialists to determine which system may be right for you! Single pass cleanroom airflow systems typically are smaller in size and range up to about 400 square feet and are most common in Hardwall Modular Cleanrooms and Softwall Cleanroom designs.  HEPA FFU’s (Fan Filter Modules) air is introduced into the ceiling plenum using filtered attic air intake vents pulling in ambient or conditioned air and exhausting it out the sides of the cleanroom walls through low wall exhaust grills back into the ambient (outside) environment or for a Softwall Cleanroom the air is typically exhausted under the vinyl curtain.

The HEPA modules feature variable speed controllers from 200-850 CFM to ensure the air change rates are met per the desired classification level. It must also be conditioned low enough to offset the heat loads of the HEPA fan filter motors, light fixtures, process equipment, air change rates and number of personnel in the cleanroom enclosure. Re-circulating cleanroom airflow systems filter air through a dedicated air handling system specifically designed and engineered to maintain the cleanroom at the required operating environmental tolerances. Re-circulating airflow systems offer temperature, relative humidity, and pressurization controls through a controls system on the air handling unit itself and are typically paired with static HEPA filtration modules versus fan powered modules. Unidirectional airflow can be adjusted and directed by placement of the HEPA filtration modules and low level returns to direct airflow and heat load removal in areas of the cleanroom environment that require higher degrees of airflow.

Lower cleanliness class cleanrooms can also be filtered by a HEPA unit in line with the supply air from the HVAC system versus ceiling mount modules (in some cases) to reduce cost and maintenance requirements in the future. Designing and engineering the cleanroom air handling systems correctly the first time through is always less costly than attempting to repair an incorrectly designed system or retrofitting a system after the fact. how big of an ac unit do i need for 3000 sq ftAir temperatures and relative humidity along with pressurization of the ambient air should be measured and documented over a twenty four hour timeframe. air handling unit manufacturersWhen attempting to rely on a single pass ambient air controlled cleanroom enclosure for environmental tolerances, depending on process equipment, function, and number of personnel, it is not improbable that the cleanroom environmental conditions can run higher than the ambient outside area. moving air conditioning unit

These environmental conditions will ultimately lead to contamination with fungus and microbial growth with possible rust particulates generated by any metal surfaces.Heating, Ventilation and Air Conditioning Systems (HVAC) Terra AC modules maintain the narrow temperature range required by garbed personnel and sensitive equipment inside a Several configurations are available, with return air recirculated through Vertical Air Return modules mounted outside the cleanroom or directly through the BioSafe® In very large BioSafe® structures, Terra recommends 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. 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. AC and RH Control Services up to # FFUs For Cleanrooms up to 7’ (2134 mm) high Air Conditioning without a Ceiling Plenum In these structures, cooled air directed from the A/C module upward through an air return module (included with the A/C unit). 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 six FFUs. Additional FFUs are typically fed air recirculated from the cleanroom through Vertical Air Returns, as shown in the Depending on the number of fan/filter units (FFUs) being serviced, additional A/C or Vertical Air Return modules may beAdjustable 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 all hardware required to connect and seal the duct. A/C Module mounted to return plenum, with cooled air ducted to fan/filter units.

Modules with Air Returns 9’ (2743 mm) high handlers ventilate cleanroom air either to the ceiling plenum or the external environment (as shown in illustration) Air handlers allow precise adjustment of pressure inside a cleanroom by ventilating air either into the ceiling plenum or to the externalBy removing the right volume of air, this equipment creates a net negative pressure inside the cleanroom, as required in BSL-2 and other applications involving potentially hazardous materials. Call Terra to discuss your application. often involve potential bio-hazards, negative-pressure cleanrooms require careful engineering to ensure the proper ventilation volume, exit air filtration, and system seals. More information on High-Volume BioSafe® Panels accommodate electrical and gas utilities, insulation, air returns Panels: Pre-engineered, modular structures provide smooth, Configurations: internal walls, antechambers, corridors