Frpipe fire-retardant pipe
消防英语词汇第551页 ... frpf=fireproof防火的 Frpipe=fire-retardantpipe阻燃管 FRPP=flameretardantphosphonitraticpolymer阻燃磷酸硝酸酯聚合物 ...
FW-FG
flame propagating conduit
Fire Resistant PVC Bellow