求翻译：2、风机型式。我国吸油烟机开发初期采用电风扇或换气扇用的轴流式风机型式占有一定的比例，这类风机风量较大，但风压低，因而被离心式风机所取代。目前重点厂家的吸油烟厂的风机均达到高风量、高风压的要求，使用性能较开发初期大有提高。是什么意思？

2, the fan type. The early days of our range hood fan or ventilator using the axial fan type with a certain proportion of such large amount of fan air, but wind down, they have been replaced by centrifugal fans. Currently the oil factory in key manufacturers are to achieve high air flow fan, high pr

2, wind-models. My cooking hoods early development using electric fans or ventilator use axial-flow-wind models occupy a certain percentage, such flow of air more than others, but wind down and they were replaced by centrifugal blower. The current focus of the manufacturers of cooking hoods factory

2nd, air blower pattern.Our country attracts the lampblack machine development initial period to use the axis which the electric fan or the ventilating fan use to flow the type air blower pattern to hold certain proportion, this kind of air blower amount of wind is big, but the wind pressure is low,

2, fan type. Range hood fan or exhaust fan in the early development of axial-flow fan used for possession of a certain proportion of such fan is large, but the wind down and was replaced by centrifugal fan. Currently focus on manufacturers of smoke factory fans meet the requirement of high air flow,

2, the fan type. The early days of our range hood fan or ventilator using the axial fan type with a certain proportion of such large amount of fan air, but wind down, they have been replaced by centrifugal fans. Currently the oil factory in key manufacturers are to achieve high air flow fan, high pr