ventilation!

Hello! i need advice about ventilators in my grow box... i have 45x55x120cm box and 250W lighting.. and i need to know where to put my 12CM PC FAN as exhaust.. its better to put it on top of the box or on top on side of the box? and how should be big the intakes holes? its enough 2x 10cm by 20 cm of the bottom of the box? please HELP PLEASE!!! thank you

A 120mm case fan has a cfm rating of 100 to 150 cfm with no negative pressure. Place your exhaust at the top and intake on the bottom. Two 12cm holes add an intake will be sufficient. Keep in mind the fan is not designed to draw through any type of filter and the performance will be dramatically reduced.

CokeyoDrips said:

A 120mm case fan has a cfm rating of 100 to 150 cfm with no negative pressure. Place your exhaust at the top and intake on the bottom. Two 12cm holes add an intake will be sufficient. Keep in mind the fan is not designed to draw through any type of filter and the performance will be dramatically reduced.

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and its better to have exhaust and intake hole on the same side? or exhaust at the opposite side?

okey and when i will use for intake pc fan too? like this https://www.rollitup.org/members/farmingtoronto-60163-albums-new-intake-fans-picture792866-2-120mm-pc-fans-intakes.jpg ? its ok?