A fireplace will puff smoke into a room if its design is flawed.
Fireplace size for room.
For example if the width of the room is 4m the length 8m and the room is 2 8m in height the cubic area or total volume of the room is.
It s a nomograph from the brick industry.
To calculate what size of fire or stove you will need measure the width length and height of the room or space and multiply the three figures together to obtain the cubic area of the space to be heated.
I d hoped to have as big a fireplace as possible up to 60 wide.
The same thing goes for stone on each side.
The physics of smoke rising into a chimney is complex and several things must be done right so all the smoke from the fire exits your home.
The great room that the fireplace will be built in is 16 feet wide by 25 feet deep 400 sq ft with 10 ceilings.
However the most important aspect to consider in order to optimize your fireplace s efficiency is its power its capacity to heat expressed in btu.
From your specs page i ve concluded that 60 is way too big as would be the 48 model.
To properly size a flue you must use a nomograph.
This is a wonderful flue sizing tool.
A small room can be described as that with less than 300 square feet while anything above this may be considered big.
A 36 or 42 fireplace opening width is more common but you need to assume about 18 on each side for a typical non combustible surround and wood mantel 24 on each side for something more grand.
The size of the room is an important criterion regarding this major purchase.