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【单选题】
某大型商场12层、层高4m，防烟楼梯间和合用前室均设置机械正压送风，合用前室每层设置1个1.6mx2.0m的双扇门和一个500mmx1400mm的送风阀门，合用前室的送风口为常闭风口，门洞断面风速取0.7m/s。每层楼梯间至合用前室设置1各个1.6mx2.0m的双扇门，楼梯间的送风口为封口，门洞断面风速取1.0m/s。火灾时楼梯间压力为50pa，何用前室压力为25pa。试确定何用前室的机械加压送风量？
A.
31289m3/h
B.
28100m3/h
C.
25800m3/h
D.
26074m3/h
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