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.
Fireplace size for room.
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.
For large rooms 1 65 of the total room footage should be used.
It s a nomograph from the brick industry.
You need enough room to make it look like an actual masonry fireplace.
To properly size a flue you must use a nomograph.
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.
The size of the room is an important criterion regarding this major purchase.
A fireplace will puff smoke into a room if its design is flawed.
The dimensions for a small room are 1 30 of the total rooms square feet to be used as the fireplace opening.
The great room that the fireplace will be built in is 16 feet wide by 25 feet deep 400 sq ft with 10 ceilings.
A small room can be described as that with less than 300 square feet while anything above this may be considered big.
The same thing goes for stone on each side.
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.
From your specs page i ve concluded that 60 is way too big as would be the 48 model.