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Home
Products
Airflow attenuation
Acoustical louvers
Duct silencers
Plenums
Industrial noise control
Acoustic enclousers
Noise barriers
Sound absorbers
Air filtration and clean room units
Air filtration
Clean room units
Airflow management
Control dampers
Flow measuring units
Industrial dampers
Overflow units
VAV&CAV units
Building ventilation
Equipments
Ventilation diffusers
Architectural diffusers
Ceiling diffusers
Displacement diffusers
Floor diffusers
Slot diffusers
Wall diffusers
Ventilation grilles
Ventilation louvers
Ventilation valves
Fire and smoke safety
Control and fire management
Fire dampers
Industrial fire and smoke control
Passive fire protection sytems
Smoke control dampers
Smoke vents
Heating and cooling systems
Duct type heating cooling
Fan coils
Trench technology and floor convectors
Unit heaters
Industrial ventilation
System technology
Solutions
Architectural Design
Airports and Travel Hubs
Datacenters
Heavy Industry
Stadiums and Arenas
Educational Facilities
Hospitals
Hotels, Resorts and Casinos
Indoor Firing Ranges
Residential
Office Buildings
Marine
Offshore Oil and Gas
Laboratories and Cleanroom
Services
Software
Downloads
Guides and Advice
Technical Service
Expertise
About
Certifications & Associations
Contacts
✕
Overflow units
NRD61 – back draft damper
NRD61V – horizontal mounted vertical flow back draft damper
NRDR – backdraft damper for round ducts
PRD61 – pressure relief damper
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