Mine ventilation duct, duct works, duct, mine PVC duct - Ventilation more safer Zoucheng Huatai Mining Engineering hairdryer hairdryer manufacturers ore prices duct PVC duct Supplier Uses: used in coal mines , tunnels, underground local fan positive pressure ventilation machine; duct structure and Dimensions hairdryer varieties: Hair Dryers by coated cloth materials into rubber coated fabric positive pressure air duct, plastic and rubber-coated fabric positive pressure duct Positive plastic coated cloth duct. Mine Hair Dryers product specifications are 300mm, 400mm, 450mm, 500mm, 600mm, 800mm, 1000mm hairdryer various positive, negative hairdryer, specification is complete, quality and cheap. Products may need to connect both ends of round steel ring or zipper-type connector according to the customer, the length can be arbitrarily extended. Project size tolerance (mm) duct diameter (D) 300 400 450 500 600 800 1000 0 ± 6 duct length (L) 5 10 20 0 ± 100 Notes: 1 shaped duct, duct size or special shape specifications , elbows, tees, etc., can be manufactured according to the demand side. 2, hairdryer rings, rings and other metal end fittings specifications are subject to special requirements agreed upon by both parties. 3, hairdryer plus anti-side ends of the length L, of 150-200mm.