Fan Application Guide (Technical Memoranda) by TM42 Working Group

By TM42 Working Group

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2). Static pressure in a duct may also be measured by providing a static tapping in the wall of the duct in a position where the flow is not disturbed by adjacent duct irregularities. It is important, however, that the hole used for measuring static pressure should be small (about 2 mm diameter) and free from burrs inside. 8 m and the static suction pressure is 220 Pa, what is the air flow rate in cubic metres per second? 4 Schematic of a pitot tube Static pressure tapping 36 Fan application guide backwards after drilling as clean a hole as possible.

These differences vary with the size of the fan as (a) and (c) especially are size related. 3 Human perception of sound Human speech is mainly in the 1–4 kHz range, so human hearing is most sensitive in this range at lower sound levels. e. a ‘flat’ response. The ear can hear over a very large range of sound pressure levels, from a quiet whisper to the roar of a jet engine. In order to accommodate this range, and partially mimic how sound is experienced, a logarithmic scale is used. The type of log scale is called a decibel scale: 10 log10.

It is important, however, that the hole used for measuring static pressure should be small (about 2 mm diameter) and free from burrs inside. 8 m and the static suction pressure is 220 Pa, what is the air flow rate in cubic metres per second? 4 Schematic of a pitot tube Static pressure tapping 36 Fan application guide backwards after drilling as clean a hole as possible. It is usually satisfactory to wet the square-cut end of a thick walled rubber or PVC tube about 5 to 6 mm bore and hold it hard against the outside smooth surface of the duct over the static hole until the manometer connected to the other end of the tube reaches a steady reading.

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