Stove making noise

[Warm winters]

i have a St Croix Greenfield, Fired it up for 2nd time this year. Burning great but get a very
Loud noise sounds like maybe exhaust blower. After about hour it got better. Could it be going
Bad??? Is there anything I can do to make it better. Stove is new to me really don't want to
Play parts changer.

 

[Bioburner]

How well have-has it been cleaned? An out of balanced fan can make a fair amount of noise.