Emphasizes that the resistance of the pipe system and the air infiltration rate under smoke exhausting are far more than those under ventilation, so as to need a careful calculation.
强调排烟工况下管网总阻力、漏风量均远大于通风空调工况，必须严格认真地计算。
The technology principle, construction and design calculation of resistance noise reduction for HD6 5 1 big power local ventilation fan developed recently are discussed in this paper.
介绍了新研制的HD 6 5 1型大功率局部通风机成功降噪的阻性消声技术原理、结构和有关计算，并应用在通风机上进行实际检测。
Based on the base point measuring method of the barometer, the layout alternatives and the calculation theoretical basis of the ventilation resistance measurement in Baode Mine were introduced.
基于气压计基点测定法，介绍了保德煤矿通风阻力测定的布置方案和计算理论依据。
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