What must be ensured for a service door between a salon and a house?

For a service door between a salon and a house, it is crucial that it be kept closed during service. This requirement is primarily related to sanitary and safety standards. Keeping the door closed helps to maintain an appropriate environment in both the salon and the residential space, preventing contamination and ensuring that the salon operations are conducted in a controlled setting. This practice also enhances privacy for clients and minimizes the risk of accidents or interruptions during salon services.

While other considerations about the door's design or function may seem important, the primary focus in this context is on maintaining the safety and cleanliness of the salon environment. Therefore, ensuring the door remains closed during service is essential for compliance with health regulations and operational best practices.