Mesorat%20hashas for Chullin 250:18

דתנן ר' יוסי אומר

The woven cords of beds and the lattice-work of windows serve as partitions between the house and the upper room to prevent the passage of uncleanness to the other side.<span class="x" onmousemove="('comment',' If these networks are stretched out across the lower room forming a ceiling thereto, they become forthwith part of the structure of the room and as such cannot contract uncleanness. Moreover they serve as a partition and prevent the uncleanness from passing into the room above, for the meshes or holes in the network do not give passage to the uncleanness since there is no opening a handbreadth square in it. Consequently whatsoever happens to be in the upper room, even that which is directly over a hole in the net, remains clean.');">¹⁰</span>

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