| 摘要 |
PROBLEM TO BE SOLVED: To provide a clean oven wherein circulating hot air is always cleaned by an internal filter and circulated in a constant temperature oven and be excellent safety, with which a work is practicable without being exposed to high temperature hot air or odor hot air, and labor sanitary when a handling person takes in and out a sample and a product. SOLUTION: In a closed type constant temperature oven consisting of an inner oven 1 having a constant temperature part and an outer oven 13 and circulating hot air through the constant temperature inner oven, an internal filter 3 is provided to purify circulation hot air introduced in the constant temperature inner oven 1. An internal heater 2 and a circulation fan 6 are situated between the inside of the outer oven 13 and the constant temperature part of the inner oven 1 and an opening and closing shutter 4 to supply or shut off hot air to the constant temperature inner oven is situated facing the internal filter 3. An exhaust damper 8 is situated at the upper part of the outer oven 13 and an exhaust duct 9 is provided. During use, the exhaust damper 8 is opened or closed in correspondence to the opening time or the closing the of an opening and closing door 10 situated at the outer oven 13 and further, the opening and closing shutter 4 is closed or opened.
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