Standard fireplace mantel height. Again proper height is relatively subjective to your fireplace but average or standard fireplace mantel height construction is around 54 above the hearths floor. As a general rule they range between 50 and 60 inches but are a number of factors can influence the actual height ranging from the type of stove or fireplace you are installing to the material your mantle is created from plus national and local fire codes. The nfpa states that mantel depth is directly related to the required height clearance between the top of the fire box and the bottom of the mantel.
Standard size mantels this selection of mantels is designed to fit more standard size fireplaces. As the mantel opening width increases so does the mantel shelf length and mantel body width. Minimum mantel vertical clearances.
The proper height of a fireplace mantel depends on the height of the hearth the size of the fireplaces fire box and the requirements of the local building codes. Many models are available in 2 sizes those that fit fireplaces roughly 36 wide or less and those that fit fireplaces 42 wide. Six inches of clearance on either side of the fireplace opening is also standard.
Your fireplace may fit this dimension or it might be on the shorter or taller end of the spectrum when it comes to mantel height above fireplace. For wood mantels the opening width opening height and return depth can be adjusted to accommodate different fireplace opening and fireplace surround facing material dimensions.