Overpressure damper with combined blades and spring

The GP100KC-S overpressure dampers with spring are used to naturally intake or exhaust air by using just the pressure difference between the two sides. Being internally conjoined stabilises the blade movement and distributes loads uniformly. The spring allows adjustment of the blade opening pressure.

In-duct overpressure damper with spring – Model GP 100 KC-S
The blades are conjoined by an internal connecting rod which makes them move in unison and distributes loads uniformly across each blade. They allow air to pass through until the pressure between the two sides of the grille equalises.
At this point, the blades close automatically through gravity.

The spring allows adjustment of the blade opening pressure.
The spring is adjusted by tightening or loosening a special control that adjusts the spring length and, therefore, its rigidity and elastic response.

Technical features:

  • Sizes range from 200mm x 210mm to 1600mm x 1610mm (for B>1400 dual section construction);
  • 4-piece welded frame, 160mm casing, 1mm thick, 36mm flange on both sides;
  • 100mm spaced galvanised steel blades;
  • galvanised steel pass-through pins;
  • self-lubricating sintered bronze bushes;
  • galvanised steel stops;
  • G.A. Class 1 adhesive anti-noise seals on blades and stops;
  • external galvanised steel levers;
  • galvanised steel traction spring, fixed to a control pin and special brace, that can be adjusted in-situ.

AISI 316L stainless steel version also available, with AISI 316 stainless steel pass-through pins and selflubricating sintered bronze bushes. The frame is made from 4 pieces welded together, 40mm flange.
Galvanised steel spring.


  • ATEX IIGD -40°C < T < +50°C;
  • Declaration of Conformity EAC and EAC-ex.
  • Uniform movement and load distribution due to linkage of the blades.
  • Opening pressure can be adjusted in-situ via adjustable spring.
  • Lightweight construction.
  • No flutter phenomenon thanks to the linked blades.
tech sheettech sheet

Condizioni generali di vendita

Condizioni generali di acquisto

General Conditions of Purchase