return air fan
31Duct leakage testing — A duct leakage tester is a diagnostic tool designed to measure the airtightness of forced air heating, ventilating and air conditioning (HVAC) ductwork. A duct leakage tester consists of a calibrated fan for measuring an air flow rate and a… …
32Coandă-1910 — Coandă 1910 …
33coal mining — Coal was very important in the economic development of Britain. It was used as fuel in the factories built during the Industrial Revolution and continued to be important until the 1980s. The main coalfields are in north east England, the north… …
34HVAC — may also stand for High voltage alternating current. See also: Glossary of HVAC HVAC systems use ventilation air ducts installed throughout a building that supply conditioned air to a room through rectangular or round outlet vents, called… …
35Ventilation (architecture) — Ventilation is the intentional movement of air from outside a building to the inside. It is the V in HVAC. With clothes dryers, and combustion equipment such as water heaters, boilers, fireplaces, and wood stoves, their exhausts are often called… …
36Fume hood — Infobox Laboratory equipment name = Fume hood caption = A common modern fume hood, acronym = other names = Hood Fume cupboard uses = Fume removal Blast shield inventor = manufacturer = model = related = Laminar flow cabinetA fume hood or fume… …
37Duct (HVAC) — A round galvanized steel duct connecting to a typical diffuser Fire resistance rated …
38Furnace — For other uses, see Furnace (disambiguation). Industrial Furnace from 1907 A furnace is a device used for heating. The name derives from Latin fornax, oven. In American English and Canadian English, the term furnace on its own is generally used… …
39Guiding Light — For other uses, see Guiding Light (song). Guiding Light GL final title card, 2008–2009 Genre Soap opera Created by …
40Central heating — unit A central heating system provides warmth to the whole interior of a building (or portion of a building) from one point to multiple rooms. When combined with other systems in order to control the building climate, the whole system may be a… …
