You don t want to play with fire and if you don t have a liner then you re in danger of burning down your house.
Fireplace insert without chimney liner.
The chimney draft is created like a tornado when a warm front meets a cold front.
Please remember these liners are sold in 5 increments 15 20 25 so for instance an 18 chimney will need a 20 liner.
A liner going to an insert or stove in the fireplace will be measured from the top of the chimney to the top of the insert or stove or the center of the hole on the back of the stove.
Stoves inserts connected to fireplaces.
This is why it is important to have a wood burning fireplace insert installed with its own round properly sized and insulated chimney liner pipe.
Without a chimney liner your chimney will be in danger of overheating which can cause your chimney to combust.
When the correct insulated chimney liner is installed there is far less resistance to flow and very little temperature variation within the venting system therefor although creosote is not.
For chimneys more than 40 inches 1016 mm wide two additional no.
A different equation when installing an insert into a fireplace the size of an insert s firebox is smaller than that of the masonry firebox so the existing masonry flue may now be disproportionately large.
4 vertical bars shall be provided for each additional flue incorporated into the chimney or for each additional 40 inches 1016 mm in width or fraction thereof.