ASHRAE recommends that thrust restraints such as Kinetics Model HSR Thrust Restraints are spring-based fan thrust control devices designed for HVAC fans, air-handling equipment, and high static pressure systems. Suitable for MEP and mechanical room applications across the UAE, GCC, and MENA region, HSR restraints help control fan discharge forces and support stable HVAC equipment operation.
Kinetics Noise Control Inc. Products
Kinetics Model HSR Thrust Restraints are engineered to counteract the discharge force generated by fans during operation. They are typically used in pairs and installed on the centerline of the fan discharge outlet, bridging the flexible duct connector to help control thrust movement effectively.
HSR Thrust Restraints are recommended for fan heads, suspended fans, and base-mounted or suspended air-handling equipment operating at 2 inches or greater total static pressure. They are often used with inertia bases for floor-mounted fans to improve equipment stability and reduce operational movement caused by fan thrust.
Each HSR assembly consists of high-deflection, large-diameter, laterally stable steel coil springs mounted within a threaded rod and bracket assembly. The coil springs are designed to provide stable performance under fan operating conditions, while the threaded adjustment rod allows movement adjustment under normal fan static pressure. The system includes mounting bracket angles, bracket back-up plates, and attachment hardware for fan and ductwork installation.
For HVAC, MEP, and mechanical services projects in commercial buildings, hospitals, hotels, industrial facilities, data centers, and infrastructure developments, HSR Thrust Restraints provide a practical solution for controlling fan thrust, supporting vibration isolation performance, and protecting connected ductwork and equipment assemblies.
Thrust Restraints shall consist of high deflection, large diameter, laterally stable steel coil springs assembled into a threaded rod and angle bracket assembly. Coil springs shall have a lateral spring stiffness greater than 1.0 times the rated vertical stiffness to assure coil stability. Coil springs shall provide a minimum of 50% overload deflection capability to solid and shall be safe when temporarily loaded to solid capacity. Coil springs shall be polyester powder coated for corrosion protection and shall demonstrate successful completion of a 1000 hour salt spray test per ASTM Standard B-117. Thrust Restraints shall feature molded neoprene end load plate assemblies for light capacities or stamped steel end cups for heavier capacities. Thrust Restraints shall include threaded adjustment rod with zinc-plated hardware, and shall include primer painted fan and ductwork mounting bracket angles, bracket back-up plates, and complete fan / ductwork attachment hardware.
Thrust Restraints shall be Model HSR as manufactured by Kinetics Noise Control, Inc.
