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.
The base fabric. The first major difference is that oilcloth has a base fabric of 100% cotton, where as PVC tablecloth has none. Just a white non-woven backing. All oilcloth designs get printed on to the top layer of the cotton fabric, ready for coating.