DuraVent DuraTech 8" Roof Radiation Shield wave-fire-urn You can calculate the middle

You can calculate the middle width of your firebox by measuring the width (left to right) approximately half way back in the firebox

Hidden Technology For an Unobstructed View

Three design options to choose from

Firebox dimensions: 46

Product Dimensions: 47 13/16" W x 30 7/16" H

DuraVent DuraTech 8" Roof Radiation Shield wave-fire-urn You can calculate the middleWith a Thermal Tech blanket insulation encased between dual walls, DuraTech offers the optimum in safety and performance. It keeps the outer wall of the chimney cool, while ensuring high flue gas temperatures for optimum draft performance. The inner wall is 25% thicker than competitive chimneys for an extra margin of safety. No locking bands or mechanical fasteners required. DuraTechs sleek 1" wall design provides for easy installations through 16" on