Washing machine drain-p trap info

In some plumbing codes, they will require a vent for the washer, and a vent for the sink.

It depends on where you are, and whether you want the inspector to pass off on your plumbing.
For about 3 bucks, you can move on with your project.
The photo was done to pass UPC codes.
 
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I'm right in the middle of putting this in when I saw your post. My grateful thanks to you and your super photo. We are in upc code area.
 
May I also ask why the vent for the washer, I assume its the one to the right of the sink or tub trap arm, is not angled towards the standpipe? Thanks so much for any feedback!
 
I have from right to left, standpipe, the p trap and an inch of pipe, a horizontal tee under a san tee (vented) draining a bar sink on other side of wall. I can only put the second vent sweep on the horizontal drain running left of horizontal tee which is under vertical tee, stacked to left of p trap.

Does it make sense?
 
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Adding a standard rough for a washer with dryer box.
The vent on the left from the downstairs is for the first floor kitchen.
The washer box has hammer arrestors.

washer_rough_1.jpg
 
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