The unmatched modernism along with a perfect combination of functionality and comfort, gives the Osburn Inspire 2000 it's inspiring beauty. With it's timeless design and guaranteed reliability and durability, the Inspire 2000 is a celebration of the past and an embrace of the future of the industries contribution to sustainability. The Osburn Inspire 2000 will charm you with not only it's elegance but it's performance and low emissions rate. This insert has a firebox volume of 2.4 cu. ft., an optimum efficiency of 77% and ability to heat the area for up to 8 hrs, while doing what it can to protect our environment by only producing an average of 1.54 g/hr of particulate emissions. Happy Heating!