Look through the category and a single number appear far more than the rest: 36". That dimension isn't the standard for no reason. It reflect what masons were constructing in American homes for most of a century: a firebox opening around that width. https://www.capandgown.stanford.edu/profile/kragelundubzengel18965/profile As a leading provider of hearth products, we help make every project a pleasure. https://www.lanubedocente.21.edu.ar/profile/ogdenrkzdavis29653/profile The following highlights a 36 gas fireplace insert. If Yours Isn't 36 The practical benefit of a common standard is options: more models, more finishes, more price points is available at that size than anywhere else. If your firebox measure smaller, compact models handle that without difficulty. Should it be larger, the options thin out but remain, and a decorative face bridges the remaining space neatly. The standard size just offers homeowners more options. Whether you need gas or propane, our team help you. Size Your Insert Ready to size the project? https://umkmcerdaspajak.id/profile/birthenemy2/ If you're after a showroom visit or a quote, the right team guide you plan the project. Get in touch with our specialists today and plan your fireplace.