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Highly Toxic: a gas that has a LC 50 in air of 200 ppm or less. [2] NFPA 704: Materials that, under emergency conditions, can cause serious or permanent injury are given a Health Hazard rating of 3. Their acute inhalation toxicity corresponds to those vapors or gases having LC 50 values greater than 1,000 ppm but less than or equal to 3,000 ppm ...
However, low-quality coal fuels and badly designed fireplaces produced much local pollution emitted from chimneys from smoke and tars, due to partial combustion of the coal. As a result, the smoke and noxious gases were often trapped locally when a weather inversion occurred.
Ventless fireplaces (duct free/room-venting fireplaces) are fueled by either gel, liquid propane, bottled gas or natural gas. [ clarification needed ] In the United States, some states and local counties have laws restricting these types of fireplaces.
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Their product lines include gas, electric, and wood fireplaces for both indoor and outdoor settings. [4] They also produce additional products and accessories such as fireplace inserts, free-standing stoves, gas log sets, and venting products. [5]
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