Selkirk 4" BW Attic Shield (Oval Type B Gas Vent) ocean-blue while the improved air wash

while the improved air wash system allows glass doors to stay cleaner

Input (BTU/HR) 41

By effectively heating only the areas you spend most of your time

*When ordering standard masonry overlap fit doors it is best to go with the smaller frame size

Selkirk 4" BW Attic Shield (Oval Type B Gas Vent) ocean-blue while the improved air washSelkirk 4" BW Attic Shield The Type BW attic shield is used on a single story AVS building or on the top story of a multi story building for Type BW gas vent. A 26 gauge galvanized sleeve should extend from the top of the ceiling plate into the attic. A Type BW attic shield is required by Los Angeles Code and UMC. Oval Type B Gas Vent Model OV Type B Gas Vent offers all of the advantages and installation conveniences of round pipe in a compact oval