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2. Furnace (central heating) - Wikipedia

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

   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 compared to a mid-efficiency forced-air or forced-draft furnace, is the capture of latent heat from the exhaust gases in the secondary heat exchanger.

3. Draft (boiler) - Wikipedia

   en.wikipedia.org/wiki/Draft_(boiler)

   In a water boiler, draft is the difference between atmospheric pressure and the pressure existing in the furnace or flue gas passage. [1] Draft can also be referred to as the difference in pressure in the combustion chamber area which results in the motion of the flue gases and the air flow.

4. 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 ...

5. Centrifugal fan - Wikipedia

   en.wikipedia.org/wiki/Centrifugal_fan

   Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.

6. Reference designator - Wikipedia

   en.wikipedia.org/wiki/Reference_designator

   IEEE 200-1975 or "Standard Reference Designations for Electrical and Electronics Parts and Equipments" is a standard that was used to define referencing naming systems for collections of electronic equipment. IEEE 200 was ratified in 1975. The IEEE renewed the standard in the 1990s, but withdrew it from active support shortly thereafter.

7. Savings interest rates today: Beat the Fed's next move with ...

   www.aol.com/finance/savings-interest-rates-today...

   Find the best strategy for protecting your money in our guide to saving and investing. Editor's note: Annual percentage yields shown are as of Monday, December 16, 2024, at 8:10 a.m. ET. APYs and ...