Without them, the flames would burn high near the gas input and taper down near the other end. That can increase the risk of mold growing inside the home. Because there is no oxygen limitation, the 40,000 BTU limit for vent-free models does not apply to outdoor units. See what plans are available in your neighborhood. Another option is to divide the burner into different sections and supply separate gas feeds to each section. All of these log stacks are designed to fit in a standard, up-to-code fireplace. All you need is an outlet and the right framing or mounting hardware. 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