FSD37 : UL 555/555S 1.5 hr./Class I, V-Groove Blade, 2,000 fpm and 4" w.g. max, Optional Sleeve
Dampers - UL Marking and Application Guide | UL Solutions Code Authorities
Model DFD-M150 Dynamic Rated Fire Dampers - Greenheck Pages 1-3 - Flip PDF Download | FlipHTML5
Dampers - UL Marking and Application Guide | UL Solutions Code Authorities
Fire damper supplier in UAE on X: "UL classified (ul-555/ul-555s) products 1. Motorized fire & smoke damper 2. Fire damper 3. Motorized fire damper 4. Motorized smoke damper #dubai # #firesafety #sharjah #
UL 555 FIRE DAMPER & UL 555S FIRE/SMOKE DAMPER
Curtain Fire Damper (UL 555 & QCDD Approved) - Jerseymep.com
File:Ul555 fire damper test.png - Wikimedia Commons
Dampers - UL Marking and Application Guide | UL Solutions Code Authorities
Dampers - UL Marking and Application Guide | UL Solutions Code Authorities