Superior 4" Outside Air Kit for BRT40ST See-Through Gas Fireplace battery-powered measure the rectangular opening on

measure the rectangular opening on the top of the unit

Model FPPK14-FLEX-LP-ST Dimensions L-14" x W-14" Max BTU 90

The average range of 25-30 feet

3125" (W) x 5

Product is setup for liquid propane but can be converted to natural gas using included conversion kit

Superior 4" Outside Air Kit for BRT40ST See-Through Gas Fireplace battery-powered measure the rectangular opening onWhat'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