AHR Expo and its co-sponsors, ASHRAE and AHRI, have chosen the Rosenberg I-series backward curved fan as the WINNER in the Ventilation Category of the 2025 AHR Innovation Awards.

The award-winning Rosenberg I-Series impeller EC fan increases airflow and energy efficiency, while greatly reducing noise. The I-impeller design features five backward-curved, hollow-profiled, airfoil section aluminum blades, with an efficiency-optimized circumferential diffuser. Depending on fan size andSource: Rosenberg USA operating point, the new impeller boosts efficiency by up to 11% and cuts noise levels by more than half compared to older impellers.

I-series blades are positioned diagonally and top-flared so that airflow direction is optimized for the highest efficiency and flow rates. The new design significantly reduces the turbulent downstream air produced by traditional backward-curved impellers. The effect of this reduction is to significantly reduce noise and increase in-application efficiency.

The I-impeller is statically and dynamically balanced according to DIN ISO 21940. Noise levels range from a high of just 89 dB to a low of 68 dB while moving up to 12% more air than earlier models.

I-series fans are available with Rosenberg Gen3 and Gen3+ EC motors operating at up to 7.2 kW of power input. All I-series fans are AMCA Certified for sound and air movement performance.