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BTfd2e93 · 01-27-2014, 12:59 AM

vacuum pump.

its the impeller spinning that makes the sound. if u listen closely. ... u will hear it spool down ... after around 1-2 mins.... after startup.

01-27-2014, 12:59 AM	#2
BTfd2e93 Registered User Join Date: Sep 2013 Posts: 140	vacuum pump. its the impeller spinning that makes the sound. if u listen closely. ... u will hear it spool down ... after around 1-2 mins.... after startup.