DuraVent DuraPlus 6 in. Stainless Steel Wall Thimble

Adjusts from a minimum of 4 3/4 to a maximum of 7 3/4 wall thickness, and fits between standard wall studs. To accommodate thicker walls, the telescoping pieces can be extended up to 16 with a field-fabricated extension installed. Interior trim ring painted black. Must be installed with DuraPlus chimney pipe horizontally through the wall and extend a minimum of 2 into the room beyond the interior wall.