Rs - Department of Agriculture, Meghalaya
Jun 19, 2009 ... Installation, and Operation of Sub-Slab Depressurization Systems, December 1995. .... After the ball valve the pipe size will increase to 4 inch ... A 6-inch schedule 40 PVC pipe will extend vertically from the fan. ..... Wrap penetration with polypropylene cable tie at a point two inches (2") above the base of the ...
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