The Isokern Vent Free 46" Gas Fireplace is the largest in the series, offering maximum flame presence and heating coverage without the need for a chimney. Designed to be the focal point of your space, it combines efficiency with beauty. Extra-wide 46" opening for dramatic viewing Vent-free design eliminates the need for venting Works with propane or natural gas log sets Lightweight pumice modular design for strength and efficiency High heating efficiency with a clean indoor burn Vent-free gas log set (required) Brick liner kits (herringbone or running bond) Decorative mantels and surrounds