Greenheck now offers the largest UL Listed, non-actuated, dynamic fire dampers in the industry. Four new models are available to protect oversized openings in buildings. Featuring a fabricated steel 3V blade type, model DFD-210 has a maximum size of 128” x 100” with a 1.5-hour fire resistance rating; model DFD- 230 has a maximum size of 72” x 48” with a 3-hour fire resistance rating. Featuring fabricated steel airfoil blades, model DFDAF-310 has a maximum size of 128” x 100” with a 1.5-hour fire resistance rating; model DFDAF-330 has a maximum size of 120” x 96” with a 3-hour fire resistance rating. Greenheck offers a large number of models of UL certified dampers and AMCA licensed dampers. For more information about Greenheck products, visit www.greenheck.com