Their aeroacoustic design includes a noise-optimized impeller which significantly reduces its operating noise.
The proven 3200J S-Force series of fans run at very high speeds to maintain performance against high system resistance. The 3250J S-Panther series extends this application range with fans designed specifically for lower system resistances, therefore operating at more moderate speeds. In addition, the impeller has added aeroacoustic improvements – including an artificially generated surface disturbance on the blades which acts as a turbulator – delaying an impending stall. These changes result in a substantial lowering of acoustic noise.
Featuring an updated aeroacoustic impeller blade design with turbulator, the 3250J S-Panther series offers substantially improved acoustic characteristics. The sound power of the S-Panther is far lower than that of other fans, particularly in the higher frequency ranges starting at 1250 Hz. Operating at lower speeds, the S-Panther fans also achieve a 20-25% improvement in bearing life over the S-Force fans.
A comparison of the 3258J/2H3P S-Panther to the 3218JH3 S-Force at an operating point of 110 CFM at 0.6” shows a reduction of 4 dB(A) in sound power for the S-Panther fan. The maximum free air flow in this series (158 CFM) is provided by the 3258J/2H3P at a sound power level (SPL) of 77 dB(A). At the other end of the spectrum, the 3258J/2HP generates a free air flow of 85 CFM at an SPL of only 58 dB(A). These SPLs are 5-6 dB(A) lower than S-Force fans at the equivalent air flow.