Standard Fireplace Size

The shape and size of your fireplace depends on three main factors.

Standard fireplace size.

When building standard models make sure hearth pads extend at least 16 inches beyond the fireplace s front edge. Standard hearth pad dimensions apply to fireplaces with openings less than 6 square feet. There are five key dimensions to measure the height and width of the opening the height and width of the back wall of the fireplace and the depth of the fireplace. The fuel type the mounting option and the location where you want it.

The size of fireplace insert you require is related to the size of your existing masonry chimney. Sides of firebox must pinch in towards back. Also ensure the hearth pad stretches at least 8 inches past the right and left edges of the fireplace. A safe route is to make it 12 longer than the fireplace box.

Back wall of fireplace must be straight up for first 12 inches. A 42 inch fireplace will probably have a mantel width of 54 inches. The capacity of a chimney to remove smoke and or energy btu s from an appliance is directly related to the cross section area. The fireplace opening is a very important element in fireplace design.

The mantel should not be so wide that it reaches anything else like a wall window or door. Outdoor fireplaces can be as small as four feet tall three feet wide and two feet deep. Figure 1 shows details and table 1 provides the widths and heights of fireplace. Fireplaces can range from a small two feet by two feet and smaller up to massive creations that take up an entire room s walls with chimneys spanning two stories.

This will tell you which of the most common sizes you are looking at buying. For a quick calculation on size make sure that the mantel shelf width divided by 2 is less than the width from the fireplace center to any wall window door or shelf. 48 72 96 120. Fireplace design details checklist.

Standard hearth pad dimensions vary based on the width of the fireplace. For instance if your fireplace box is 42 then you would order a 56 long mantel. The configuration and dimensions of most other components of the fireplace and chimney are based primarily on the dimensions of the fireplace opening selected. Some make it just larger that the firebox.

The firebox must be shaped and sized perfectly so it doesn t smoke revised september 2018.