Tunnel Dampers
Dampers that meet the rigorous environment of transit tunnel air applications.
Tunnel Dampers
Dampers that meet the rigorous environment of transit tunnel air applications.

A tunnel transit damper is a heavy-duty flanged air damper designed to meet the rigorous environment of a transit tunnel. It is qualified to withstand the stresses and pressures of such environments. It meets the requirements of NFPA-130, NFPA-502, UL 555S, and BS476 standards.

HTD-630
HTD-630
Features a fabricated airfoil blade with pressure to 24 in. wg, velocity to 4,000 fpm and fatigue at 8 million reverse cycles at 24 in. wg.
https://catalog-api.greenheck.com/api/product/en-us/seo/htd-630
HTD-636
HTD-636
Features a fire-related fabricated airfoil blade with a British Standards 476 certification.
https://catalog-api.greenheck.com/api/product/en-us/seo/htd-636
HTD-640
HTD-640
Features an aluminum extruded airfoil blade and meets National Fire Protection Association (NFPA-130 and 502).
https://catalog-api.greenheck.com/api/product/en-us/seo/htd-640