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2. Fire-resistance rating - Wikipedia

   en.wikipedia.org/wiki/Fire-resistance_rating

   The completed test sample is inserted into a furnace such that one side is exposed to a fire. The test is terminated when the fire stops successfully meet the test criteria in minimizing the amount of heat and smoke allowed to pass through the assembly, when the fire penetrates the fire stops. This determines the fire stop F-Rating.

3. Furnace (central heating) - Wikipedia

   en.wikipedia.org/wiki/Furnace_(central_heating)

   The fourth category of furnace is the high-efficiency condensing gas furnace. High efficiency condensing gas furnaces typically achieve between 90% and 98% AFUE. [3] A condensing gas furnace includes a sealed combustion area, combustion draft inducer and a secondary heat exchanger. The primary gain in efficiency for a condensing gas furnace, as ...

4. Hot blast - Wikipedia

   en.wikipedia.org/wiki/Hot_blast

   James Beaumont Neilson, previously foreman at Glasgow gas works, invented the system of preheating the blast for a furnace.He found that by increasing the temperature of the incoming air to 149 °C (300 °F), he could reduce the fuel consumption from 8.06 tons of coal to 5.16 tons of coal per ton of produced iron with further reductions at even higher temperatures. [4]

5. Industrial furnace - Wikipedia

   en.wikipedia.org/wiki/Industrial_furnace

   Ceramic fibre is commonly used for the roof and wall of the furnace and is graded by its density and then its maximum temperature rating. For example, 8# 2,300 °F means 8 lb/ft 3 density with a maximum temperature rating of 2,300 °F. The actual service temperature rating for ceramic fiber is a bit lower than the maximum rated temperature.

6. Thermostat - Wikipedia

   en.wikipedia.org/wiki/Thermostat

   Start draft inducer fan/blower (if the furnace is relatively recent) to create a column of air flowing up the chimney; Heat ignitor or start spark-ignition system; Open gas valve to ignite main burners; Wait (if furnace is relatively recent) until the heat exchanger is at proper operating temperature before starting main blower fan or ...

7. Staged combustion - Wikipedia

   en.wikipedia.org/wiki/Staged_combustion

   Primary air (70-90%) is mixed with the fuel, producing a relatively low temperature, oxygen-deficient, fuel-rich zone, leading to only moderate amounts of NO x being formed. The secondary (10-30%) combustion air is injected above the combustion zone through a special wind-box with air-introducing ports and/or nozzles, which are mounted above ...