The Harvia M3 SL stove is perfect for small and medium-sized sauna rooms from 212-459 adjusted cubic feet (ACF). Required sauna stones 66 lbs (2 boxes) sold separately. For sauna rooms from 212 to 459 cu. ft. Requires a minimum of 66lbs of stones ( 2 boxes-AC3020)Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply). Please note that each natural stone is unique in shape and size. We recommend purchasing an additional box of sauna stones to allow you to choose the highest quality of stone for fit, form, and function (Additional freight charges will apply). Designed, engineered, and made in Finland Dimensions: 15.3" W (390mm) x 25" D (640mm) x 28" H (715mm) Installation and operation manual