1.To prevent the outdoor cabinet from being rusty and erodent, the plastic outdoor cabinet adopts the weather-proof & crashworthy PP material-the F1 Racing Car bumper material, the outdoor cabnet is finished by plastic injection one time, which can suit each outer environment(especially seaside area and island country) without being rusty and distorted. 2.Available capacity:7000BTU,9000BTU,12000BTU,18000BTU,24000BTU.