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SG 661

Duct mounted non return dampers (NRD).

Designed for use in fresh air intake or air exhaust openings, with twin fans in commercial and residential premises. NRD prevent the reverse airflow and protect against the ingress of untempered air, rain and birds into the HVAC system.

90+

Founded in
France in 1925

14

Subsidiaries
catering to 60 countries

14

Hundred
employees working

300

Million euros
turnover