What should be cleaned when servicing vent hoods in kitchens?

When servicing vent hoods in kitchens, it's essential to clean both the exhaust vent and the filter. The exhaust vent is responsible for ventilating smoke, moisture, and odors generated during cooking, and if it becomes clogged with grease or debris, it can compromise the efficiency of the ventilation system and increase the risk of fire hazards. Cleaning the filter is equally important, as it captures grease and particulates from the air, which can also accumulate and hinder airflow. Proper maintenance of both the exhaust vent and filter ensures optimal performance, reduces fire risks, and promotes a healthier kitchen environment.

The other options focus on components that, while they may need attention in certain contexts, do not encompass the essential elements that require cleaning during routine maintenance for vent hoods specifically.