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400 SYSTEM 600 SYSTEM 800 SYSTEM 1000 SYSTEM 1200 SYSTEM Size of system 400mm square or circular 600mm square or circular 800mm square or circular 1,000mm square or circular 1,200mm square or circular Size of core 120mm diameter 200mm diameter 200mm diameter 200mm x 400mm 530mm diameter Number of fans 1up to 140 l/s 1up to 285 l/s 1up to 540 l/s 2up to 790 l/s 3up to 1,050 l/s Windcatcher ventilation rate (at 3m/s wind speed) Additional ventilation rate (from fan) 50 l/s 195 l/s 260 ...

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