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2. Johnson Controls Hitachi - Wikipedia

   en.wikipedia.org/wiki/Johnson_Controls_Hitachi

   In India, Hitachi air conditioners are manufactured and marketed by Hitachi Home & Life Solutions India Ltd, which is a joint venture between Hitachi Homes and the Johnson Controls group based in Ireland. The company is headquartered in Ahmadabad, Gujarat. It has another Global Development Center in Kadi, Gujarat. [5]

3. 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 ...

4. Variable refrigerant flow - Wikipedia

   en.wikipedia.org/wiki/Variable_refrigerant_flow

   Variable refrigerant flow (VRF), also known as variable refrigerant volume (VRV), is an HVAC technology invented by Daikin Industries, Ltd. in 1982. [1] Similar to ductless mini-split systems, VRFs use refrigerant as the primary cooling and heating medium, and are usually less complex than conventional chiller-based systems.

5. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   The output of the infrared LED (like that of any infrared remote) is invisible to the human eye because its wavelength is beyond the range of visible light (940 nm). This system is commonly used on mini-split air conditioners because it is simple and portable. Some window and ducted central air conditioners uses it as well.

6. Hitachi - Wikipedia

   en.wikipedia.org/wiki/Hitachi

   Hitachi maintained a 40% stake in the resulting company, Johnson Controls-Hitachi Air Conditioning. [50] In May 2016, Hitachi announced it was investing $2.8 billion into its IoT interests. [51] Hitachi’s rail business in Europe, especially in the United Kingdom, expanded in the 2010s, with Hitachi Newton Aycliffe starting operations in ...

7. Duct (flow) - Wikipedia

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

   Downstream of the air handler, the supply air trunk duct will commonly fork, providing air to many individual air outlets such as diffusers, grilles, and registers. When the system is designed with a main duct branching into many subsidiary branch ducts, fittings called take-offs allow a small portion of the flow in the main duct to be diverted ...