产品规格（Product Specifications）：
|
内径mm Inner Dia. mm
|
8.5
|
10
|
12
|
14
|
16
|
20
|
22
|
25
|
32
|
38
|
50
|
|
外径mm Outer Dia. mm
|
11.5
|
13
|
15
|
17
|
20
|
25
|
27
|
30
|
36
|
44
|
56
|
产品说明：
长度任意，阻燃效果好（自熄）。应用于建筑物穿墙、天 花顶不需经常活动的电线套管。
Product Features:
It features freely-decided
length and sound fire retardant effect (self-extinguishments. It is used as the
cable conduit passing through walls, inside the ceiling or at other hidden
positions.