Customize products, re-calculate prices according to customers' design drawings, sales volume, etc. "1: Scope of application: buses, etc.2. the new air duct with aluminum alloy profile structure has beautiful and elegant appearance, simple and bright appearance, long service life and good weather resistance. Especially, the air duct adopts lock-type fixing mode, which is convenient for disassembly and assembly, and is beneficial to the installation and maintenance of bus air conditioning pipes and wire bundles; The advertising air duct specially designed for public transport has a large advertising area and is convenient to replace, so the advertising page can be replaced directly without opening the air duct. "