WebFire damper assemblies expand during periods of intense heat. Therefore, it is essential that openings in walls or floors be larger than the fire or combination fire smoke damper assembly to allow for this expansion. The wall/floor opening must be a minimum of 7⁄ 8 in. (22 mm) larger than the outside diameter of the damper. WebSep 8, 2024 · There are two common construction types of fire dampers: curtain and multi-blade. Both styles are manufactured using either galvanized or stainless steel, and both utilize a fusible link to hold the damper blades open until it reaches an elevated temperature (minimum of 165°F).
Greenheck-USA
WebThe FSD-331 is a combination fire smoke damper with airfoil blades. This model is rated for use in walls, floors, or partitions with a fire resistance rating of 3 hours or more and a Class I leakage rating. Pressure: Up to 8 … WebModel DFDR-510 is a dynamic rated round fire damper for use in HVAC systems that are operational in the event of a fire. This fire damper is rated for use in walls, floors, and partitions with less than 3 hour fire resistance rating and can be mounted vertically or horizontally. Diameter Minimum Size Maximum Size Inches 4 24 mm 102 610 Size ... ontouchmove 阻止冒泡
FD-110, R14, January 2024 - Greenheck-USA
WebOut of Wall Fire Smoke Dampers Combination Fire Smoke Dampers with a 1½ hour fire rating – UL 555 and UL 555S Classified Combination fire and smoke dampers are used … WebA:Counterbalance weights on Greenheck's backdraft dampers (BR, EM, ES, HB) are all adjustable for each specific application. Each blade has the option to add, remove, or position the weights to fine tune your system. Installation, operation and maintenance instructions are available on the web site for your reference. Q: WebLINE OF WALL DO NOT INSTALL SCREWS BETWEEN THESE LINES AROUND ENTIRE DAMPER Retaining Angles (see Section 4) Line of Wall Airflow Detail 1 DO NOT INSTALL SCREWS BETWEEN THESE LINES AROUND ENTIRE DAMPER Access door required on jackshaft side of damper. Refer to the latest edition of NFPA 90A. Jackshaft Actuator … ios wifi nfc tag