Adaptive Stove Jack with FlapUpgrade your canvas tent or wall tent with the Adaptive Stove Jack with Flap. This durable stove jack is made from 17oz fiberglass cloth and measures 18" x 18", while the canvas flap is made from a 10oz fire, water, and mildew treated canvas for added protection against the elements. The stove jack is not pre cut, but features stitched in patterns at 5" and 6" that you can cut out as needed. For best results, cut out just in front of the stitching