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SM-EFATEX Rev E - Page 6 of 13
Fan Performance Characteristics
Fan performance is characterized as airflow as a function of backpressure. Backpressure is
typically a function of the length of flexible duct attached to the fan.
Maximum airflow also referred to as free air occurs at 0 mm/ 0” w.g.
The first chart shows 4 performance curves for all four ATEX fans running on 50Hz AC power.
The second chart show 3 performance curves for three of the ATEX fans, running on 60Hz.
Please note that the EFi120xx is not designed to run efficiently on 60Hz AC power and does
not appear on the 60Hz chart for this reason.
Fan Performance Characteristic for Fans Running on 50Hz AC power