(Air Ducting,Insulated Air Flexible Duct & Silent Insulated Duct)

Made of Aluminum foil + insulated sponge / Grass Wool + pet + steel wire

(Silent insulated duct Punched many small hole, can absorb most of sound from airstream)

Good insulation---heat insulated.
(Absorb noise---can absorb the noise from the shaking when ventilated.)
No corrosive---not corrode the alu. pipe and metal parts.
Durability---not decay, mildew, durability.
Fire---resistance.
Practicality: suitable for the densely-populated area (such as school, supermarket, office, stadium, theater, factory...) high requietment of the enviroment area, such as hospital, laboratory, howff, bus, train, broadcasting studio.

NOTE: OTHER SIZES AND LENGHT ETC ARE AVAILABLE ON REQUEST.