Overall score includes:

Performance (60%)
Rates steam extraction from 2 and from 4 simmering saucepans on both high and low fan speeds.

Ease of use (30%)
Covers filter cleaning, controls and lighting over cooking area.

Noise (10%)
Measured 50cm from the front edge of the hood.

Running costs (100 hours) 50 hours on low and 50 hours on high setting. Assumes electricity costs of 26c/kWh.

Mode Mode tested. Most models have test results in both modes.

Prices from a December 2018 survey.