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Sometimes weep holes are placed at the bottom of the chimney to drain out collected water. A chimney cowl or wind directional cap is a helmet-shaped chimney cap that rotates to align with the wind and prevent a downdraft of smoke and wind down the chimney. An H-style cap is a chimney top constructed from chimney pipes shaped like the letter H ...
A simultaneous development was the Kylchap blastpipe, combining the Kylälä spreader by Finnish engineer Kyösti Kylälä, and a further flue choke tube added by the French engineer André Chapelon. This split the blastpipe area into four smaller nozzles, and the vertical draught induction across three stacked venturis. Although the total ...
An H-style cap (cowl) is a chimney top constructed from chimney pipes shaped like the letter H. It is an age-old method to regulate draft in situations where prevailing winds or turbulence cause downdraft and back-puffing. Although the H-cap has a distinctive advantage over most other downdraft caps, it fell out of favor because of its bulky looks.
A (keyless) wooden flute. The Irish flute is a simple system, transverse flute which plays a diatonic (Major) scale as the tone holes are successively covered and uncovered. . Most flutes from the Classical era, and some of modern manufacture, include various metal keys or additional tone holes (such as a seventh, "pinky-hole", to access one lower note, typically the seventh degree of the ...
Some recorders have tone holes too far apart for a player's hands to reach, or too large to cover with the pads of the fingers. In either case, more ergonomically placed keys can be used to cover the tone holes. Keys also allow the design of longer instruments with larger tone holes. Keys are most common in recorders larger than the alto.
Open-hole – a finger key with a perforated center. Pointed arms – arms connecting the keys to the rods, which are pointed and extend to the keys' centers. These are found on more expensive flutes. French model – a flute with pointed French-style arms and open-hole keys, as distinguished from the plateau style with closed holes.