The 12"/30 cm UB30 takes design cues from the UB20 in a larger form. The larger blower/exhauster produces a higher airflow for use in larger confined spaces. The larger the area you are trying to ventilate the more airflow you’ll need. The RAMFAN UB30 has unmatched performance for a fan its size. It is built with a durable housing to withstand industrial workspace environments. Specifications  Model UB30 (115V) Part # EJ4002 IMPA Code 591403 Motor 1 Hp / 0.75 kW Motor Type Thermally Protected Motor Electric 115V, 50/60Hz, 1ø Amps (Start/Run) 33A / 8A Cable Lengths 15’/4.6 m, 16AWG/1.5mm2 Plug Types 15A NEMA 5-15P Noise 95 dB @ 3' (1 m) Weight 37 lbs / 17 kg Dimensions (h/w/d) 20 x 15.5 x 12 in / 51 x 39 x 31 cm Duct Adapter 2   Accessories: Duct Adapter/Reducer Disposable Duct ECKO Flex™ with carrying bag