The present invention relates to a device for preventing the inflow of external air at the time of checking the thermo-hygrostat, in particular, the filter (2) and the control unit (3), the compressor (4), the evaporator (5), the humidifier and the blowing fan (inside the main body 1). In the constant temperature / humidity device provided with 7), the air inflow prevention plate 6 is detachably attached to the lower opening formed between the shelf 8 provided in the middle part of the main body 1 and the bottom surface of the main body 1. It is characterized by the installation.;Therefore, when the door is opened to check the operation status of internal components or to perform maintenance to grasp the operation status, etc. during operation of the thermo-hygrostat, the air in the room does not flow directly to the blower fan without passing through the heat exchanger of the thermo-hygrostat. It is possible to prevent the constant temperature and humidity control of indoor air even when checking the thermo-hygrostat, so that the reliability of the product can be greatly improved, and the accurate inspection of the thermo-hygrostat itself can be performed. It can also be greatly improved.;Constant temperature and humidity, door, blower, air inlet prevention plate, fixing means, airtight opening
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