"6.0. AIR SICULATION SYSTEM ...Tenney Environmental Test Chambers are provided with an efficient airflow management system that maintains maximum temperature uniformity. Chamber air is conditioned in the conditioning plenum where the fans, heater elements, refrigeration coil, and humidity injection port are located. The plenum is isolated from the workspace...."

Там даже фото внутреннего устройства этого блока есть, на стр. 20., собозначением змеевиков, нагревателей, температурного реле и т.д.

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Note added at 14 час (2015-11-20 13:52:44 GMT)
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Вместо "SICULATION" прошу читать "CIRCULATION", конечно.

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Note added at 14 час (2015-11-20 13:54:18 GMT)
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Вместо "SICULATION" прошу читать "CIRCULATION", конечно.

*

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Note added at 5 hrs (2015-11-20 04:56:58 GMT)
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http://radio.vilcom.ru/upload-files/news/20_03_2013/Klimatic...
можно просто "потолочный отсек системы кондиционирования"

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Note added at 1 day13 hrs (2015-11-21 13:17:13 GMT)
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http://www.bollandmachine.com/resources/For-Sale-Items/Lunai...
Humidification of chamber air in the -3 and -4 models is accomplished by water vapor injection, which is
generated by a Vapor-Flo Humidity Generator. The vapor is injected into the conditioning plenum near the conditioning blower intake.
Lunaire chambers are engineered with a highly efficient horizontal airflow system to provide maximum temperature uniformity. The generation and conditioning of airflow occurs in the plenum conditioning section at the top of the chamber. The plenum is isolated from the workspace so that no direct radiation to the product can occur.