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in the blow one the air move through the fan then through the filter then to the room,,,,,and in draw case the air pass on the filter before the fan .
Blow through whereas the fan be at up stream then passing to cooling coil and at the end thrrough to filters , whilst the drawthrogh the fan will be at downstream air flow and vise versa.........
Draw Through Fan which is commonly used, suck air through the DX Coils and circulate it in the supply ducting whereas the Blow Through Fan is mounted directly after the Return ducting and blow the air across the DX Coils to maintain air circulation in ducting.
