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NKTMJ Non-Return/Back draft Damper resistant against seismic events

NKTMJ – Non-Return/Back draft Damper closes at reverse airflows in HVAC systems and shut off duct automatically.

 

Characteristics

  • Min. dimensions 200 × 200 × 210;
    max. dimensions 2 000 × 2 000 × 210 mm (square cross-section only, round adapter available)
  • Only mechanical variant
  • Plain bearings, maintenance-free design
  • Max. permissible leakage via closed blades - 2% of nominal airflow
  • External casing leakage class C acc. to EN 1751
  • Max. airflow 25 m/s
  • Variant with, or without counterweight
  • Mechanism installed externally of the damper axis and airflow direction
  • Pressure difference up to 7 500 Pa (internal vs. external pressure)
  • Carbon steel painted, galvanized,or stainless steel – casings made of 3 mm sheets, tight seam welds
  • Radioactive aerosol impact allowed - decontaminable
  • Seismic resistance defined as per RRS (EDB, APC) applicable to the site – tested to peak acceleration above 10 G
  • Min. service life 40 years,maintenance interval 10 000 hours