The Hopper Extension is an easy to install, USA quality made product that will fit any of the popular 2000 sq. ft. front door bay window pellet stove models like the Evolution, Summers Heat 55SHPEP(L), Englander 25-EP and Timber Ridge 55-TRPEP found in Home Improvement and Hardware stores. Your stove's present hopper opening will be about 18 1/2" wide by 13 1/2" for this to fit. The Hoppers outside dimensions will be 22.5" wide by 15.75" front to back and 9" tall. You provide the stove, we provide the hardware to reattach your lid with gaskets, limit switch bracket (that accepts the push button or lever style switch), extension wires and the instructions. Also, a set of instructions to help the lid issues while lessening the chance of future failure---for free! This improvement will put the final touches to making your stove a much friendlier machine to own and operate. It is easy and simple to install with the use of a small socket, a 3/16" drill and a pair of pliers, your pellet stove will hold 3 1/2 bags (around 140 lbs.) of pellets. The manufacturer of The Hopper Extension is in no way liable for indirect, incidental or consequential damages in connection with this product including any costs or expense, providing substitute equipment or service during periods of malfunction or non-use. Please! Keep children, furniture, fixtures, and all combustible materials away from any heating appliance. Refer to the owner's manual for all clearances to combustible materials. No PO Box or outside of the lower 48 states shipments!!! Need The Hopper Extension for a different stove? Let us know what stove you have and how much capacity you would like to add! The more requests we get for your make and model, the better chance of us making one for you! Proudly made in USA for you.