ventilation noise

This paper shows how to redesign the building acoustic sound insulation lab without altering its function and structure to gain a reverberation environment of which the background noise level is lower than 15dB ( A) when the ventilation system is working.

文章重点介绍在机械通风和不影响建筑隔声实验室原有的实验功能与结构的前提下如何对建筑隔声实验室进行改造以获得背景噪声低于15dB（A）的混响场实验环境。

Ventilation system design and noise control of a 300 kW diesel generator room

300kW柴油发电机机房通风系统设计及噪声治理

The methods of vibration absorption, noise reduction and ventilation purification are described.

给出了胶片负压展平系统减振 、 降噪和排气净化的方法.

Based on characteristics of petrochemical enterprise, some shortcoming of existing apparatus for environment protection, such as ventilation installation, anti-noise facilities and shower eyecup etc., was analyzed at a safety angle.

针对石化企业的特点，从安全角度出发，分析石化企业现有通风、防噪声、淋浴洗眼器等防护设施存在的问题。

All mechanical ventilation systems must meet the indoor ambient noise levels in Table 1.1 of BB 93.

所有机械通风系统必须满足室内环境的噪音水平在表1.1中BB93.