Chimney Liner Block Off Plate

This opening will vary in size but generally you will be installing a 6 or 8 chimney liner.

Chimney liner block off plate.

Heavy aluminum 26 or 24 ga sheet metal both work. When you have such a large opening around the liner a large amount of the hot air generated from the wood stove will be rising up into the chimney cavity. The damper sealing kit is designed to seal off your damper around your stainless steel chimney liner kit when installing a fireplace insert or a freestanding stove. It is very common to have to ovalize a short section of the liner in order to pass the liner through the throat damper.

Top plates and caps can be ordered through most liner companies. A block off plate is particularly helpful with inserts installed in fireplace on exterior walls with exterior chimneys. To prevent this from happening install a block off plate. This can result in a significant cooling of the stove and large heat loss.

The block off plate is a fail for now we could not get the liner off the flue collar at the insert level in order to get the insert free we would have had to setup a ladder and climb the chimney about 35ft off the ground grade is 10ft below fireplace chimney is about 25ft and disconnect the liner at the top and lift it off i personally. The block off plate can be made from most any non combustible material. Stagnant air is a pretty good insulation. This will prevent any airflow through the area around the liner.

The block off plate is a horizontal plate that blocks off the opening where normally a damper is in a fireplace.