Kitchen Vent Questions


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Posted by Myron Maurer on December 12, 1997 at 04:47:11:

Upon browsing the Internet, I felt compelled to ask a couple of question pertaining to the DWV requirements for our new residence in Michigan. Our city operates under the '91 Uniform Plumbing Code. My specific questions are as follows:

1. To compute specific soil and vent pipe sizes, I computed the dfu's for each respective fixture/stack. Upon doing so I further calculated that we would need to terminate (2) vent stacks above the roof. The pipe sizing table (Table 4-3) in the '91 UPC suggests I only need (2) 2" vent stacks. The asterisk on the sizing table, however, indicates that the cross-sectional area of ALL vent stacks (A=6.28) terminating through the roof must equal or exceed the cross-sectional area of the 4" building drain (A=12.57) entering our home. Therefore, I assume I must now vent (2) 3" stacks through the roof to meet code. Our exterior walls are 2" x 4" studded walls and I would REALLY like to come through the subfloor with a 2" vent stack upon draining each fixture and then use a 3"/2" reducer in the attic to meet the venting requirements. Is it acceptable (i.e. code) to use a reducer in the attic to meet the venting code?

2. Upon using the pipe sizing table, I also computed that in our kitchen we would need a 1 1/2" stack vent to vent the kitchen sink and dishwasher. The kitchen layout, however, is such that the sink and
dishwasher are in an "angled" bar layout. I am within the allowable 3' 6" developed length to vent the kitchen sink (2 dfu) on the vertical soil stack, however, I do not know what the requirements are, if any, to vent the dishwasher. I ASSUME that since the flexible hose from the dishwasher connects through the garbage disposal/sink that it, too, may be vented with the sink stack vent (i.e. vertical soil stack)? If not, I will now exceed the 3' 6" allowable distance from the soil stack.


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