1. People with health problems: People with serious heart disease, hypertension, respiratory diseases, infectious diseases or other potential health problems can consult a doctor before going to the sauna room to see if it is suitable for use.

2. People under the influence of alcohol or drugs: If customers show obvious influence of alcohol or drugs, it may affect their understanding and judgment of safety precautions, so they should refuse to enter the sauna room.

3. Pregnant women: Because the high temperature environment in the sauna room may have potential risks to the health of the fetus, remind pregnant women to avoid entering the sauna room.

4. Younger children: The high temperature environment in the sauna room may bring discomfort and even health risks to younger children. In order to ensure their safety, they are not allowed to enter unless there is a specially designed children's area.

5. How to refuse the entry of these customers can take the following measures.

6. Display a clear notice: put a notice board at the door of the sauna room or in a conspicuous position, clearly listing the conditions for restricting entry, including health status, alcohol or drug effects, etc. Customers can judge for themselves whether they meet the requirements before entering.

7. Training staff: Ensure that staff know and understand the policy of restricting entry and can actually operate according to the situation. They should be authorized to refuse unqualified customers to enter.

8. Give explanations and suggestions: If the customer does not meet the entry requirements, the staff can politely explain the reasons and provide other appropriate choices, such as reminding him to seek medical treatment or use other facilities.