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How High For A Condensate Standpipe?

The condensate drain can not have a “stand pipe” it won’t drain if plumbed into a drain I suggest above a p -trap as this prevents some blockages by mold
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Trap layout for double vanity with existing stack

My unartistic rendering of @ecnerwal's answer -- hoping I've understood it.
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Trap layout for double vanity with existing stack

Under IPC code, you need a trap for each fixture as I read the code. Don't know what code applies, but IPC and UPC are more similar than different, and most parts of the USA use one of those at least ...
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When does an under the sink P-Trap assembly need venting?

I'm no plumber, but the drain pipe from the sink looks like 1-1/4" in diameter, then the p-trap looks like 1-1/2" in diameter then the short piece into the wall looks like 1-1/4" in ...
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