what happens if the airflow blocked to a fan?

If airflow is blocked to a fan, the fan will struggle to operate efficiently, leading to increased pressure within the fan housing. This can cause the motor to overheat and potentially fail due to the excessive load. Additionally, the blocked airflow can result in reduced cooling or ventilation in the area, which may lead to overheating of connected equipment or an uncomfortable environment. In some cases, the fan may shut down entirely as a safety precaution.