Typical implementations are internal and external fins or multiple small bore tubes.

Also brush or vacuum the external fins at the rear of an air-conditioner and straighten any that are bent.

Some boosters are cooled by water jackets or external fins to increase convectional cooling by the ambient air, but smaller models may have no special cooling facilities at all.

There are 5 buildings radiating out from the Crescent, including the Library building, distinctive with its orange and yellow external fins, and the Theatre building, a circular building that houses the 300 seat Centre Stage Theatre.

Clean and straighten the rear external fins if you can reach them or if the air-conditioner can be easily taken inside.

Clean and straighten the external fins, at the rear, if you can reach them.

Any external fins at the rear of an air-conditioner should also be cleaned and straightened.

Clean and straighten the external fins at the rear of the air-conditioner.

The vanes kept the rocket pointed straight up and later on its correct course until it built enough airspeed to be guided by its external fins.