正压通风
今天参观了济南市平阴县一家祖代隔离+育成鸡场。该鸡场每个鸡舍存栏2万只祖代鸡青年鸡。4层8列，空气能供暖、湿帘降温。湿帘和鸡舍之间有一个缓冲间，有一个抽风机从缓冲间吸入降温的空气，通过管道送入鸡舍内。同时，在缓冲间和鸡舍之间的墙上，装有排风扇，需要时打开风扇向鸡舍内吹风。
与普通湿帘不同的是，湿帘两侧都有过滤网。鸡舍末端出风口也有过滤网。这种设计减少了外部空气传入尘埃的几率，也减少了鸡舍内向外散播粉尘和病原微生物的几率。
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过滤网很有必要， 出风端装滤网不光影响换气量还影响舍内空气质量，滋生细菌，是不是为了防蚊蝇和飞鸟的措施 估计也有这个目的
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