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2. Ducted fan - Wikipedia

   en.wikipedia.org/wiki/Ducted_fan

   In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller . [ 1 ] When used in vertical takeoff and landing ( VTOL ) applications it is also known as a shrouded rotor .

3. Fan coil unit - Wikipedia

   en.wikipedia.org/wiki/Fan_coil_unit

   A fan coil unit (FCU), also known as a Vertical Fan Coil Unit (VFCU), is a device consisting of a heat exchanger (coil) and a fan. FCUs are commonly used in HVAC systems of residential, commercial, and industrial buildings that use ducted split air conditioning or central plant cooling.

4. Propfan - Wikipedia

   en.wikipedia.org/wiki/Propfan

   A propfan, also called an open rotor engine, open fan engine [1] [2] or unducted fan (as opposed to a ducted fan), is a type of aircraft engine related in concept to both the turboprop and turbofan, but distinct from both. The design is intended to offer the speed and performance of a turbofan, with the fuel economy of a turboprop.

5. Fan (machine) - Wikipedia

   en.wikipedia.org/wiki/Fan_(machine)

   Building heating and cooling systems commonly use squirrel-cage fans driven by separate electric motors connected by belts. Standalone fans are usually powered by an electric motor, often attached directly to the motor's output, with no gears or belts. The motor is either hidden in the fan's center hub or extends behind it.

6. Propulsive efficiency - Wikipedia

   en.wikipedia.org/wiki/Propulsive_efficiency

   = is the heat energy delivered to the low-temperature system (heat sink). (It is positive because heat is added to the sink.) (It is positive because heat is added to the sink.) In other words, a heat engine absorbs heat from some heat source, converting part of it to useful work, and delivering the rest to a heat sink at lower temperature.

7. What should you set your heat to in the winter? Avoid ... - AOL

   www.aol.com/set-heat-winter-avoid-thermostat...

   Available rebates and tax credits through the Department of Energy may help pay for energy-efficient products and replace heating systems that are 15 years old or older. Funding is available for ...