Napoleon Direct Vent Gas Stove Wall Terminal Kit

No, there is no insulation around the vent pipe where it passes through the wall, nor should any be added. Napoleon requires an open air space between the vent pipe and any combustible framing, and this space must remain empty. Installation manuals for Napoleon direct vent gas stoves using this kit explicitly state not to fill the space between the vent pipe and the enclosure with any material, including insulation or combustibles, and to always maintain specified clearances around the venting and firestop systems. Loose insulation or other materials in contact with the vent pipe pose a fire hazard.

The firestop included in the Napoleon Direct Vent Gas Stove Wall Terminal Kit manages the wall penetration. The opening in the exterior wall is cut and framed to accommodate the firestop assembly. Once dry-fitted, the brackets on the rear surface should rest against the inside surface of the horizontal framing. The firestop and black trim collar then seal the wall cavity, preventing insulation and other loose materials from entering the air space around the pipe.

The specific minimum air space required is detailed in the installation manual for your particular stove model. As a general reference, the Napoleon GDS20 installation manual specifies a minimum of 1 inch clearance on the sides and bottom, and 2 inches at the top of the vent pipe for horizontal runs.

Napoleon does mention optional insulation for vent runs passing through unheated spaces like attics, garages, or crawl spaces. This optional insulation, wrapped in a protective sleeve, is used to reduce condensation and is never packed into the clearance space at the wall.

A fine-toothed hacksaw should be used to cut off the excess length.