Due to low-frequency characteristics, noise from ventilation systems in residential buildings may cause considerable concern even at low and moderate sound pressure levels.
例えばオーストリアには国民の30%をカバーするシェルターがあるだけで、換気装置がない。
In Austria, for example, coverage is 30 per cent, but most of the shelters do not have a ventilation system.
格子天井の特別な穴を通して、照明、換気装置および消火栓は正方形の後ろに隠れます。
Through special holes on grid ceiling, lightings, ventilators and fire hydrants are hidden behind Square.
ITGM-11の換気装置のための医学の酸素のセンサー/o2細胞。
ITG M-11 medical oxygen sensor/ o2 cell for ventilator.
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