It is the combination hot air rising and subsequent vacuum effect in the room below which ensures that smoke from a fireplace fire will go up a chimney. without the control of the chimney flue, this effect could quickly lead to a fireplace fire getting too hot for the fireplace to handle.
oilcloth. (textiles). A fabric coated with a mixture of oil and clay, used as a waterproof covering. A floor covering made of a heavy fabric treated with oil paint.
oil. 1. Any of a large class of liquid or easily melted substances that are typically very slippery and greasy. Oils are flammable, do not mix with water, and include animal and vegetable fats as well as substances of mineral or synthetic origin.