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2. Physics of whistles - Wikipedia

   en.wikipedia.org/wiki/Physics_of_whistles

   A trailing edge tone occurs when an exterior flow passes over a trailing edge. There is a whistle that is a combination of an edge tone and a trailing-edge tone and might be called a wake-edge tone. It occurs in rotating circular saws under idling conditions and may be called the circular-saw whistle. Under load conditions, blade vibration ...

3. Flue - Wikipedia

   en.wikipedia.org/wiki/Flue

   The heat from the flue gases is absorbed quickly by the bricks and then released slowly to the house rather than the chimney. In a well insulated home, a single load fire burning for one and a half hours twice a day is enough to keep an entire home warm for a 24-hour period. In this way, less fuel is used, and noxious emissions are reduced.

4. Heating system - Wikipedia

   en.wikipedia.org/wiki/Heating_system

   A heating system is a mechanism for maintaining temperatures at an acceptable level; by using thermal energy within a home, office, or other dwelling. Typically, these systems are a crucial part of an HVAC (Heating, Ventilation, and Air Conditioning) system.

5. Explainer-How Trump could bypass the Senate to install his ...

   www.aol.com/news/explainer-trump-could-bypass...

   President-elect Donald Trump has said he might install his picks for top administration posts without first winning approval in the U.S. Senate. This would erode the power of Congress and remove a ...

6. Gift cards that make good last-minute gifts, done and dusted

   www.aol.com/lifestyle/gift-cards-that-make-good...

   Why you can trust us We may earn commission from links on this page, but we only recommend products we believe in. Pricing and availability are subject to change. Gift cards that make good last ...

7. Furnace (central heating) - Wikipedia

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

   A two-stage furnace has to do two stage full speed and half (or reduced) speed. Depending on the demanded heat, they can run at a lower speed most of the time. They can be quieter, move the air at less velocity, and will better keep the desired temperature in the house.