With a maximum output of 125,000 BTU per hour, the DAKA 622FBT furnace will heat most medium-to-large size homes found in climates such as those in northern Minnesota. Completely made of heavy-duty 7-gauge steel (3/16" thick), the firebrick-lined firebox is designed to give years of trouble free service. Manufactured in the USA for over 30 years, DAKA furnaces are built with a few simple things in mind: BUILD THEM SIMPLE TO USE AND BUILD THEM TO LAST. The DAKA 622FBT furnace uses a forced draft combustion system. A room thermostat controls combustion air blower operation to help maintain comfortable heat level; also helps overcome poor chimney draft. There are 2 standard 550-cfm blowers. Each has a 1/10 hp rating, heavy-duty windings and permanently-lubricated ball bearings. They will handle most add-on installation applications and many smaller central installations. Each blower has twice the horsepower of many of our competitors blowers, meaning that they will not lose output when hooked into a ductwork system. With a large 25" log capacity and an 11" x 11" fire door opening, the DAKA 622FBT is big enough to heat up to a 3,000 square foot home. A cast iron fire door, along with a heavy duty grate, is standard. A full-length ash pan with built-in handle makes ash disposal easy. The unit is safety-tested to "UL standard 391-2010" by Warnock Hersey. A Dual Cold Air Filter Box that mounts directly over the blowers on the back of the furnace is included with all new DAKA 622FBT. This filter box helps reduce dust in the home and greatly extends the life of the blowers (14x25x1 furnace filter not included). For Optional Accessories, check out our Accessories Page for pricing and descriptions.