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Direct vent fireplaces are extremely efficient compared to a traditional fireplace and can operate at about 85% efficiency. Even a very efficient traditional fireplace only operates at about 15% efficiency. This is because most of the hot air generated by the fire travels up the chimney due to convection.
The fireplace insert was invented in 1742 by Benjamin Franklin, which he called 'The Pennsylvania Fireplace' (also known as the Franklin Stove), in the United States.He came upon the idea as a means of using coke (a smokeless fuel made by the destructive distillation of certain types of coal) and incorporated the use of an electric blower to improve efficiency.
IHP deals in focused markets such as industrial, residential new construction, and specialty retail. Their products are available in both the United States and Canada through various distributors and specialty hearth dealers. Their product lines include gas, electric, and wood fireplaces for both indoor and outdoor settings. [4]
This is a list of calculators produced by Clive Sinclair's company Sinclair Radionics: . Sinclair Cambridge. Sinclair Cambridge Scientific; Sinclair Cambridge Memory; Sinclair Cambridge Memory %
The therm (symbol, thm) is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU), [1] and approximately 105 megajoules, 29.3 kilowatt-hours, 25,200 kilocalories and 25.2 thermies. One therm is the energy content of approximately 100 cubic feet (2.83 cubic metres) of natural gas at standard temperature and pressure .
Manufactured fireplaces are made with sheet metal or glass fire boxes. Electric fireplaces can be built-in replacements for wood or gas or retrofit with log inserts or electric fireboxes. A few types are wall mounted electric fireplaces, electric fireplace stoves, electric mantel fireplaces, and fixed or free standing electric fireplaces.
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