TD EXPRESS,is the leading mining and tunnelling ventilation ductmanufacturer in China;;with the development of these years,ourcompany becomes a large enterprise,equipped with aweaving,coating,laminating,duct manufacture workshop.our productshave been certificated by national security and exported toBolivia,Singapore,Vietnam,Bangladesh,India,Zimbabwe and othercountries in large quantities.you can visit our website to knowmore about us. http://www.tdvent.com .