**EDIT** I didnt see this was posted in the "ask a GM" section I didnt mean to step on any toes.
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If you are reffering to traps set in areas like the Krandor Crypts for example. Each traps DC can be tweaked by the person creating the level. So I am not sure such an answer is possible, in the simplest terms.
Also there are 4 checks, Examine, Flag, Dissarm and Recover. each one is higher than the previous. In some quick testing of a simple area I created I placed some various gas traps the Examine was "X" DC, then Flag was 2 higher. Dissarm was 5 Higher than flagging, and Recover was 10 higher than Dissarm.
So to explain in this example on a Minor and Average Gas trap with no changes made to it.... it was 15 to Examine, 17 to Flag, 22 to Dissarm and 32 to Recover
But I could go in and adjust its DC if I so desired. and that would throw all those numbers out the window. follow me?
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