What’s the size of the inside of the box where the wood is to be burnt? And does this stove have a double wall? And does it have a baffle at the top?

The inside of the stove measures 19 5/8"W x 11 7/8"H x 13 1/2"D. The stove does have an extra layer on the sides and back to help reduce clearances. Please give us a call if we can help further. Thanks!