100 150 225 represents the volume of his inner box. 

The volume of HY-100B inner box is (500 * 400 * 500) mm.

The volume of HY-150B inner box is (500 * 500 * 600) mm. 

The volume of HY-225B inner box is (600 * 500 * 750) mm. 

The volume of HY-408B inner box is (800 * 850 * 600) mm. 

The volume of HY-800B inner box is (1000 * 1000 * 800) mm. 

The volume of HY-1000B inner box is (1000 * 1000 * 1000) mm. 

All the above are accepted dimensions of standard box type inner box. 

Can do fixed value and program test, fixed value is a single temperature or humidity test, program is a number of temperature and humidity point test can be all cycle or choose a separate cycle. Mainly to test the heat resistance, cold resistance, dry resistance and moisture resistance of various materials. Can be non-standard customized. Suitable for electronics, electrical appliances, vehicles, metals, chemicals, building materials and other factories.