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

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

frollard5 years ago
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.
THIS perhaps?
Wow!  What an answer.
Re-design5 years ago
Is it blowing out like smoke?
Or is it just discoloring the ceiling around the register?
seandogue5 years ago
Answer this...where did your pet mouse go?

(see lemonie's answer for a more serious reply)
lemonie5 years ago
Something bad Call the person who installed it and ask them what the- is going on.

L