Selkirk 5" x 8" Attic Insulation Shield (Direct-Temp Gas) h22.125 (F) - Base Return -

(F) - Base Return - 4 31/32"

Pipe Inside Diameter: 4 Inch

and leave the door ajar (never leave the heater unattended)

It is made of aluminum

Selkirk 5" x 8" Attic Insulation Shield (Direct-Temp Gas) h22.125 (F) - Base Return -Selkirk 5" x 8" Attic Insulation Shield The attic insulation shield is required to guard against the hazard of blown in or blanket insulation occupying the required 1" airspace around the vent. Direct Temp Gas The latest Direct Vent Gas Fireplace Venting technology listed for use with a wide variety of appliances. Direct Temp features a 304 Stainless Steel inner liner providing exceptional corrosion resistance for long term system integrity. Selkirk