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Is it normal for my gas oven window glass to fog up? Why is there moisture or condensation on the oven window glass?

Yes, this is normal.

 

When gas burns, the primary combustion products are carbon dioxide and water in the form of steam. This causes some fogging as the oven heats up. Once the oven reaches the set temperature, the moisture will dissipate, and the fog will clear up. Foods that have high moisture levels like turkey and fish may cause more condensation than usual.

Beko