1. ventilation duct with pvc bag 2. fire resistant and endure high temperature 3. easily to schlep due to the pvc bag

Normal PVC Flexible ventilation duct together with the pvc bag

Made of fire-retardant PVC material and helix steel wireEasily to connect due to flexibleEnduring the high temperature and oleic acidAcid & alkali resistant and corrosion resistant and fire resistantSchlep easily wherever exhaust and inhalation the air in the field condition due to light-weightPrevent the workers from the suffocating by improving dust air into fresh air .due to the pvc bag  ,the vent duct can be conviently schleped to anywhere during out of door working,in order to  protect the duct not be made duirty,damaged ect.

Application of the ventilation duct

-    Manhole ,tunnel and tank

-    Ship building , under-ground project

-    Welding and chemical lab or spot

ventilation duct with pvc bag