本机专门针对橡胶、塑料及各种绝缘材料之热老化性做测试,换气式老化试验机与一般烘箱之区别在于强制性达到箱内空气的置换，并达到一定的次数。不同规范中对换气量有不同的界定。

■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;

换气量的计算公式为： 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