D1250 - Multi-Blade Fire Damper • 1 ½ Hour • Dynamic • Vee Blade • No Sleeve
D1251 - Multi-Blade Fire Damper • 1 ½ Hour • Dynamic • Vee Blade • Type A
D1252 - Multi-Blade Fire Damper • 1 ½ Hour • Dynamic • Vee Blade • Type B
D1253 - Multi-Blade Fire Damper • 1 ½ Hour • Dynamic • Vee Blade • Type C