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These were cut from an Indian palmyra leaf which forms its rather large blade, moving slowly in a pendular manner. Originally operated manually by a cord [1] and nowadays powered electrically using a belt-driven system, these punkahs move air by going to and fro. In comparison to a rotating fan, it creates a gentle breeze rather than an airflow.
Figure 1: Components of a centrifugal fan An external motor belt driven inline centrifugal fan discharging inline to the exterior of a building through a duct. Unlike non-inline/non-concentric impeller casing design with a cutoff blade above, the concentrically symetric cylinder casing and impeller geometry of inline type redirects the outflow around so that it is parallel to the inflow of gases.
A household electric fan A large cylindrical fan. A fan is a powered machine that creates airflow. A fan consists of rotating vanes or blades, generally made of wood, plastic, or metal, which act on the air.
A specification often refers to a set of documented requirements to be satisfied by a material, design, product, or service. [1] A specification is often a type of technical standard. There are different types of technical or engineering specifications (specs), and the term is used differently in different technical contexts.
Sunroof systems may be manual or electric, while most moonroof systems are electric/electronic. Manual sunroofs may be lever actuated, as in venting type pop-ups, manual lever or crank operated for sliding systems. Electric roof systems are usually cable driven by a motor and feature some form of sliding opening.
FM 100–5, Operations (with included Change No. 1) 29 April 1977 [20] This manual supersedes FM 100–5, 6 September 1968, including all changes. Bernard W. Rogers: INACTIVE: FM 100–5: FM 100–5, Operations: 1 July 1976 [21] This manual supersedes FM 100–5, 6 September 1968, including all changes. Fred C. Weyand: INACTIVE: C1, FM 100–5
The first-generation iPhone SE (also known as iPhone SE 1 or iPhone SE 2016; SE is an initialism of Special Edition [6]) is a smartphone that was developed and marketed by Apple Inc. It is part of the 9th generation of the iPhone alongside the higher-end iPhone 6s and 6s Plus .
This section is missing information about elevators use guide rails: oil-lubricated guide shoes, roller guide shoes in high speed elevators or maglev shoes are used to follow the rail, high speed elevator vibration dampers, internal air pressure control and aerodynamic elevator cab and counterweight exterior, kone maxispace counterweightless ...