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Dynamic 3 Hour Rated Dampers

UL 555 classified 3 hour fire rating

Building codes require fire dampers to maintain the fire-resistance ratings of walls, partitions, barriers, and floors when penetrated by ducts or other transfer openings. Dynamic-rated-fire dampers are for use in HVAC systems that remain operational in the event of a fire emergency. These are UL 555 classified with fire-resistance rating of 3 hours or more.

DFD-310

This damper has a 2³/鈧佲倖 inch narrowline frame with pressure up to 4 in. wg, velocity up to 4000 fpm and temperature up to 286°F.

VIEW DFD-310
https://catalog-api.greenheck.com/api/product/en-us/158

DFD-350

This damper has a 3¹¹/鈧佲倖 inch frame with pressure up to 4 in. wg, velocity up to 4000 fpm and temperature up to 286°F.

VIEW DFD-350
https://catalog-api.greenheck.com/api/product/en-us/194

DFDAF-330

Airfoil multi-blade style with pressure up to 8 in. wg, velocity up to 4000 fpm, and temperature up to 350°F.

VIEW DFDAF-330
https://catalog-api.greenheck.com/api/product/en-us/195

SSDFD-350

This damper has a 3¹¹/鈧佲倖 inch frame with 304 stainless steel construction and pressure up to 4 in. wg, velocity up to 2000 fpm and temperature up to 286°F.

VIEW SSDFD-350
https://catalog-api.greenheck.com/api/product/en-us/193