1. Sometimes food has peculiar smell before it enters the cold room, because the food has been spoilage phenomenon before entering the cold room.
2. Cold room of fish, shrimp, crabs and other aquatic products is not cleaned in place after cleaning, resulting in microbial reproduction and peculiar smell in cold room.
3. The air flow in the cold room is not smooth or the temperature and humidity is too high, resulting in the multiplication of mold and mildew smell in cold room.
4, The cold room temperature can not meet the requirements, resulting in food deterioration, this situation occurs in fresh meat is not completely frozen on storage.
5. Food with different smells is stored in the same cold room, resulting in peculiar smell of food.