||External Joint(Wooyang Product)
||internal Joint(Other Company Product)
|resistance of the air
||As the joint support fixture is located in outside, there is no resistance to air flow and no noise.
||Joint support fixture & duct support fixture located in internal part. So It has huge resistance to air flow.
||Dust consist of circular thin plates. It has slippery inside, joints located in external so there is no noise caused by the air resistance
||Duct has flexible hose, joint support fixture & dust support fixture located in internal part So It has huge resistance to air flow and big noise.
||there is no resistance to air flow and no noise.
||Inner part of duct has joint and support fixture so it pile up Foreign substance.
|replacement of material
It can manufacture replacing SUS & PP for strong acidic work
Because of foreign substance, Life is short and has frequent breakdown. It has corrosion risk