Does the subject want to ask "where is the second-hand commercial air duct central air conditioning?" Second-hand electrical appliance market, second-hand equipment trading platform. The leading technology of DC frequency conversion and R4 10A environmental protection refrigerant are widely used in commercial pipeline central air conditioners, and the related products have reached the national first-class energy efficiency standards. Due to the rapid upgrading of commercial air duct central air conditioners, many second-hand commercial air duct central air conditioners have appeared in the market. Second-hand commercial air duct central air conditioning is a kind of electrical equipment, and consumers can buy it through the local second-hand electrical appliance market and second-hand equipment trading platform. Consumers must carefully check the performance and state of the second-hand commercial air duct central air conditioner when purchasing to ensure that it can work normally.