FACTORY-BUILT FIREPLACES
Hundreds of variations.
One way to find the damper.
There are hundreds of different types of factory-built fireplaces. The damper sits where the smoke chamber ends and the flue begins — grab a flashlight and look up from the bottom.
Your damper will be the metal flap, usually between 8 and 10 inches round. Some are square or rectangular. They have obvious handles you push up and pull down.
Factory-built fireplaces are cleaned with softer brushes so the metal parts aren't damaged. The smoke chamber, damper, and firebox walls are cleaned with hand brushes from the bottom.