Superior 4" Outside Air Kit for BRT40ST See-Through Gas Fireplace btu56175 10" x 18" Adjustable Length

10" x 18" Adjustable Length Pipe

UL 641 Flue Material 430 stainless Steel Casing Material Galvanized Steel Inner Diameter 4" Height/Length 60" Color Silver Technical Drawings & Dimensions

Beyond just safe

Glow Getter 18

Ceramic Fiber Liner

Superior 4" Outside Air Kit for BRT40ST See-Through Gas Fireplace btu56175 10" x 18" Adjustable LengthWhat's Included Outside Air Kit Features For use if outside combustion air is required or desired. Must be used in conjunction with locally purchased, non combustible Class 1 or Class 0 flexible duct. For use with Superior BRT40ST B Vent See Through Gas Fireplace Specifications Model Number FOAK 4LD Catalog Number 81L88 Diameter Size 4" Compatible Fireplace BRT40ST