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what causes black soot to come out of air conditioning vents, the air conditioner is brand new? Answered

what causes black soot to come out of air conditioning vents, the air conditioner is brand new?

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I would think its dust from the ductwork installation, or much worse a mould buildup (staccibotris otra).  It's not particularly bad for adults but can cause fatal pneumonia in infants.  It only grows where there are temperate humid areas in a house (like ac vents after the ac turns off).

Seconded:  Get it checked by a professional immediately.

Is it blowing out like smoke?
Or is it just discoloring the ceiling around the register?

Answer this...where did your pet mouse go?

(see lemonie's answer for a more serious reply)

Something bad Call the person who installed it and ask them what the- is going on.

L