本機專門針對橡膠、塑料及各種絕緣材料之熱老化性做測試,換氣式老化試驗機與一般烘箱之區別在于強制性達到箱內空氣的置換，并達到一定的次數。不同規范中對換氣量有不同的界定。
■This tester is specialized in the aging test of rubber, plastic and various isolation materials. Differed with the general oven, Ventilation Aging Tester can realize the compulsory interchange of air inside the box with several times. Different rules have different regulations on the ventilation volume;
換氣量的計算公式為： N=（X-Y）3590/V.D. △T
N:每小時換氣量 Number of change of ais per hour.
X:換氣耗電量W)Power consumption during air change
Y:無換氣時耗電量(W) Power consumption during no air change
V:箱內容積(cm3) total volume of over
D:箱內空氣比重 (g/cm3) Density of over ambient ais
T:箱內外溫度差 (℃)Temperature difference inside/outside