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.
SG 663
Wall mounted non-return dampers (NRD).
Designed for use in fresh air intake or air exhaust openings 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.