Airtight Air Dampers for Ventilation Systems
Airtight air dampers (hermetic dampers) are a vital component of cleanroom engineering systems, providing isolation between zones of different cleanliness classes and preventing uncontrolled air movement. Their use is critical for protection against cross-contamination, stabilization of pressure differentials, and ensuring safety when handling volatile, hazardous, or sterile substances.
These dampers are installed in supply, exhaust, and recirculation ducts of HVAC systems, as well as in process air ducts. Depending on the configuration, airtight dampers can perform the functions of automatic airflow shut-off in emergency situations, during ventilation equipment shutdown, or when changing room operating modes.
Construction and Technical Features
INEX airtight dampers are developed specifically for the operational demands of clean manufacturing environments. The design includes:
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Housing: Made of AISI 304/316L stainless steel with airtight welded seams.
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Blade Assembly: Equipped with a perimeter seal to ensure tight closure of the airflow.
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Actuator: Electric or pneumatic actuators allowing for manual or remote control of the blade position.
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Fail-safe Mechanism: Optional emergency closing via return spring or pressure accumulator.
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Connection: Flanged or insert-type connection to the ductwork.
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Additional Options: Position sensors, open/closed indicators, and interfaces for integration into Building Management Systems (BMS).
The leakage level corresponds to Class C or D according to GOST 12.3.018 and DIN EN 1751. The dampers are resistant to aggressive sanitization, withstanding pressure differentials up to ±2500 Pa and temperatures from –20 to +60 °C (optionally up to +120 °C).
Areas of Application
Airtight air dampers are used at facilities with high requirements for air environment integrity:
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Pharmaceutical plants (GMP zones).
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Biotechnological and medical laboratories.
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Sterile product manufacturing lines.
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Zones handling flammable liquids (FL) and toxic substances.
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Cleanrooms with multi-level overpressure systems.
Regulatory Compliance
The equipment is designed and manufactured in accordance with:
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GOST R ISO 14644-4:2002 — Design and commissioning of cleanrooms.
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GOST R 56638-2015 — Cleanrooms. Ventilation and air conditioning. General requirements.
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GOST 12.3.018-79 — Ventilation systems. Methods for determining the airtightness of air valves.
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TR CU 010/2011 — Technical regulation on the safety of machinery and equipment.
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Relevant PUE and SP codes for fire safety, explosion protection, and ventilation system operation.
INEX airtight dampers are adapted to customer project specifications and integrated into comprehensive ventilation and automation systems for cleanrooms.