The SDLT Shut-Off Gas Tight damper is used to block or allow passage of the airflow inside ventilation and air-conditioning systems on ships. The heavyweight frame, made from 4 pieces welded together, means it can be installed on load-bearing structures such as bridges, bulkheads or directly onto the sides of ships.

The SDLT version includes a number of special features to ensure optimum tightness.

Shut-off Gas Tight Damper – SDLT

The SDLT range comes in 3 models:

  • 0: hot dipped galvanised steel frame and galvanised steel blades;
  • 2: hot dipped galvanised steel frame and AISI 316L stainless steel blades;
  • 6: frame and blades in AISI 316L stainless steel.

The damper operates on the principle of FAIL-CLOSE or FAIL-OPEN.

Basic technical features:

  • sizes range from 150 x 150mm to 2000 x 2000mm.
  • 4-piece welded frame, 3mm thick, 215mm deep;
  • 30mm or 50mm flange (40mm on request);
  • sandwich structure blades from 1/1.5mm with seals;
  • tubular bolts in AISI 316, diameter 18mm, 1.5mm thick;
  • self-lubricating sintered bronze bushes;
  • lateral sealing strips.

Casing sizes of 160mm or enlarged up to 300mm are also available, on request.
For further details, see the Configurations section.

The Shut-off Gas Tight Dampers can be combined to create larger dampers than those listed in the range of sizes and can be fitted with manual, electrical/pneumatic systems for secure or classified areas.


  • ATEX IIGD -40°C < T < +50°C;
  • Class 3C certified in accordance with EN1751 (up to 2000 Pa);
  • Declaration of Conformity EAC and EAC-ex.
  • High mechanical resistance for use in load-bearing structures such as bridges and bulkheads.
  • Contained weight due to 3mm thickness across the range of sizes.
  • No maintenance required.
  • Optimum sealing efficiency.
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Technical documentation

Condizioni generali di vendita

Condizioni generali di acquisto

General Conditions of Purchase