1. The national retail price of Gunai fresh air system is 2380. Wall-mounted, easy to install, compact and beautiful, with the function of purifying air with negative oxygen ions and automatically detecting air quality. Suitable for ordinary families, families, offices, kindergartens, KTV, banks, restaurants, Internet cafes and other places to install. Second, the price of the central fresh air system is generally more than 10,000 yuan, and it is ducted and cannot be installed after the house is renovated. Equipped with heat recovery system, it is suitable for the installation of large-scale projects such as underground garages and shopping malls.