According to the American Iron and Steel Institute, the purpose of a blast furnace is to produce enough heat to extract iron from raw ore. Iron ore, coke and limestone are placed into a blast furnace and then heated unti... More »

Blast chillers rapidly cool food by circulating cold air through the unit until temperatures fall to safe levels. They are designed to lower the temperature of cooked foods quickly enough to minimize bacterial growth, en... More »

In boating, two short blasts of a horn indicate one boater's intention to pass another boat starboard-to-starboard, according to Boating Basics Online. This signal is used when it is impossible to pass port-to-port. More » Government & Politics Law

A Payne furnace provides heat to a home by circulating warm air through ductwork. Payne sells a range of high-efficiency gas furnaces with a variety of features. More » Home & Garden Heating & Cooling

Hot-water furnaces heat, store and distribute water throughout a home or building. Various types of furnaces use different fuel sources for heating and have varying storage capacities. More » Home & Garden Heating & Cooling

A furnace may need a tune-up if the furnace makes no heat or uneven heat, makes squeaking noises or produces a prominent smell of natural gas. Another big indicator is an increase in electricity consumption. More » Home & Garden Heating & Cooling

The annual fuel utilization efficiency measures the efficiency of a furnace by comparing the annual heat output of a furnace to the total annual fossil fuel energy consumed by that furnace. The Federal Trade Commission r... More » Home & Garden Heating & Cooling