I'm wanting to make sure I understand the concept of tilting standpipes to help alleviate noise. The picture below shows three examples of a standpipe. The red lines represent an imaginary line going straight up from the center of the bulkhead. The first pic shows the pipe straight up. The second shows the pipe tilted, but the centering red line still stays within the pipe. The third shows a more extreme angle where the opening of the pipe is tilted beyond the centering red line. I'm wandering which of these two is better or more recommended. I'm assuming the middle option but I want to be sure I'm understanding the concept of freeing the air correctly.