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2. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required. [32] (Minisplit ...

3. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   Air conditioning, often abbreviated as A/C (US) ... The units went on sale in 1932 at US$10,000 to $50,000 ... eliminate the need for large cool air ducts, ...

4. Duct (flow) - Wikipedia

   en.wikipedia.org/wiki/Duct_(flow)

   Ducts for air pollution control in a 17000 standard cubic feet per minute regenerative thermal oxidizer (RTO). A round galvanized steel duct connecting to a typical diffuser Fire-resistance rated mechanical shaft with HVAC sheet metal ducting and copper piping, as well as "HOW" (Head-Of-Wall) joint between top of concrete block wall and underside of concrete slab, firestopped with ceramic ...

5. Should You Close Vents In Unused Rooms During Winter ... - AOL

   www.aol.com/lifestyle/close-vents-unused-rooms...

   As the return removes the cool or hot air, Martin says, the supply vents replace this air with the opposite of what it is removing. In most homes, the furnace (forced air) and air conditioner ...

6. Air sock - Wikipedia

   en.wikipedia.org/wiki/Air_sock

   Air sock in an indoor swimming pool. An air sock is a textile or fabric duct used for draught-free air distribution and delivery of conditioned air as an alternative to traditional spiral or rectangular steel ducts with grilles and diffusers. Fabric ducts are usually cheaper in material cost, do not require additional diffusers, and can be ...

7. Fan coil unit - Wikipedia

   en.wikipedia.org/wiki/Fan_coil_unit

   These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.