23-3: Swing handle damper with Flueblocker behind the horizontal bracket
23-4: Measure length and width above the horizontal bracket
Fireplace #23: Swing Handle Damper with Supports and High Flue Tile
These Swing Handle Dampers are very common in masonry fireplaces of solid brick or stone. These are their characteristics:
They have a long rectangular sheet iron damper frame and matching door.
The door has a straight cast iron handle sticking down attached to a horizontal support. (image 23-2)
The handle swings forward and back.
All of the hardware is welded or bolted and is not removable.
The damper door is almost straight vertical when closed.
There are welded metal horizontal bracers below the damper (image 23-2)
This damper style is best sealed with a long rectangle Flueblocker (image 23-3). You will measure the length and depth of the area right above the horizontal bracket(s) (marked in red in image 23-4). The Flueblocker will lay right on top of those horizontal brackets. You will need to cut a small slit in the Flueblocker wool pad to accommodate the straight metal damper handle to stick through (image 23-3). Since you are threading the wool pad through a tight triangular area, it is easiest to thread the wool pad into place above the horizontal supports without the black plastic Flueblocker handles attached (image 23-3).