Model EM-485T offers a dramatic 42″ viewing area. As with the EM-415, it is designed with double walls on the sides and on the top where the heat collects. This allows us to trap heat that radiates through the first wall…heat that is normally dissipated and lost in traditional fireplaces. This heat then radiates into the room through a separate convection chamber. Additional heat tubes compound the heat production and efficiency. An optional fan can also be used to increase the heat output and efficiency. The inside of the firebox is seam locked preventing air leakage and enhancing the draft.