... fan blade, reasonable angel and reach the max. air flow, mini. Noise. All fan blade through dynamic ... steel pearl, more durable8.imported type B belt from korea, wider and thicker 35% longer circle time ... performance test, fan blade turning speed test, input air test, vehicle efficiency test and motor current test. ... .8440001380*1380*45080 New designgreenhouse/poultry air cooler/air cooling system z