Some comments:
1) Can't the beeper ringing be disabled on the configuration page by setting beeper to false?
2) On of my S3 miners has a temp of 0.
3) As a way to increase airflow, I removed the fan grills.
1) setting it to false lowers your beeps many less but still beeps. if you set it to false you get 1 beep for every hashing disconnect. not endless beeps.
2) does it hash correctly? do fans slow to under 1000 rpm
3) put those grills back fingers are important and these fans work very well for cooling this gear.
to all I am getting very good results with freq 212.5 if your gear is a lessor piece of gear try setting it at 212.5 down from stock 218.625
2) Yes and no.
3) Sorry as an engineer I go by hard data, not feel. Any grille will impede flow and its a given that you don't put your fingers in rotating machinery. Here is hard data the shows that grills reduce flow and increase noise: