Hazardous chemicals can induce a hot zone, as occupants are in danger of it disrupting their biological processes. For example, if while driving down a highway, an oil tanker gets into a car accident and spills its load on the pavement and surrounding grass areas, those areas affected will be considered hot zones.
Costs to convert wood fireplace to gas. Installing a gas line and either vented or vent-free gas logs will cost from $500 to $2,500. (Note that the cost of installing vent-free gas logs is often about $200 more than the cost for vented.) Gas inserts cost $2,000 to $5,500. Expect to pay more for fireplace installation if workers are challenged to get the gas line to your fireplace.
Converting existing fireplaces to gas is the least expensive option for homeowners and involves simply inserting gas logs. These nonflammable logs look much like real wood, and come in vented and ventless types. Vented gas logs require a working existing chimney and cost from $300 to $550, according to CostHelper. Ventless gas logs do not need a pipe or chimney and cost from $350 to $600. Installation adds $200 to $350 extra to cover a licensed contractor and a new gas outlet. Another conversion method uses top-vented gas fireplace inserts, which may include fans and thermostats.