17:03

Double Offset Reducer

28:10

Double Offset Reducer Layout

13:15

OFFSET OGIE TUTORIAL | TAGALOG

38:14

How to Fabricate Double offset

18:01

Offset Reducer transition flat one side/ducting layout/ducting transition

20:11

Transition Offset Elbow

19:04

offset reducer flat one side(DUCTWORK)

22:46

ELBOW TRANSITION OFFSET: How to make/fabricate it? Paano gawin to?