The Harrison Builder Series stone mantel surround is part of a collection of four economical mantel kits that include an adjustable facing panel and a flat 1" hearth. Please call 888.493.8898 to get a quote for special firebox widths. We can accommodate most firebox width scenarios by adjusting the length of your shelf and can accommodate 3 piece facing or seamless facing to cover the gaps. The Adjustable Inset Panel will allow firebox opening heights between 32" and 40". Each mantel has variations in color and texture that captures the true essence of natural stone. Because this stone mantel is lightweight, preparation and installation are much easier and much less costly than traditional solid stone mantels. Special wall and floor reinforcement is not necessary for easy installation. Each stone mantel is fire resistant and allows for zero clearance from combustible material (no space required between firebox and this mantel material or surround facing), making it the perfect choice for gas or wood fireplaces.