Pro/Forums - View Single Post - Performance Vs Noise

UNDERBYTE · 12-09-2005, 11:47 AM

Testing free air tells you next to nothing, fans can change 10 dBA as you go up the res. curve.

Standard practice usually involves an INCE Plennum or "Mahling Box" (george Mahling IBM) Bacically a box frame covered by a mylar flim with a sliding gate at the rear with a pressure tap on the inlet side.

Allows you to test the fans across the /flow/pressure curve

If you request flow data most manufacturers will provide it. then all you have to do is match the pressure point.

probably only cost 100-$200 to make.

You have to watch at the 1 m that you do not get noise canceling bounce, mic/source location is important

12-09-2005, 11:47 AM	#12
UNDERBYTE Cooling Neophyte Join Date: Oct 2002 Location: CENTRX Posts: 75	Re: Performance Vs Noise - Experimentation Testing free air tells you next to nothing, fans can change 10 dBA as you go up the res. curve. Standard practice usually involves an INCE Plennum or "Mahling Box" (george Mahling IBM) Bacically a box frame covered by a mylar flim with a sliding gate at the rear with a pressure tap on the inlet side. Allows you to test the fans across the /flow/pressure curve If you request flow data most manufacturers will provide it. then all you have to do is match the pressure point. probably only cost 100-$200 to make. You have to watch at the 1 m that you do not get noise canceling bounce, mic/source location is important