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.
1 Options include fans to move the heat, remote controls, wall switches and wall -mounted thermostats. Inserts cost $1,200-$2,900, with professional installation adding another $600-$1,000.  A direct-vent gas fireplace doesn't need a chimney and is a way to add a fireplace where there isn't one.