Great question. Per the installation manual if the appliance is to be installed on top of a combustible floor, it must be placed on an approved non-combustible hearth pad, that extends 8" (203mm) beyond the appliance sides and back and 18" (457mm) in Canada / 16” (406mm) in the USA to the front. The reduced clearance from the back of the appliance may result in the appliance pad terminating shorter than 8" (203mm) beyond the appliance. Also, if a section of horizontal chimney connector is used, floor protection is required under the chimney connector and 2” (51mm) beyond each side. If you have any further questions or need further assistance, please feel free to reach out to one of our experienced customer service representative and they would be happy to assist you. Thank you and have a wonderful day.