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In-line Blower Sizing

I am having difficulties sizing my inline blower used for a heated conveyor dryer while screen printing. I have two - 4" vents leaving the dryer at 380 cfm each. In the notes section of the dryer venting, it says "Ducting should create no more than 10% decrease in exhaust CFM." I will have about 5ft of vertical vent pipe and 20ft of horizontal with two - 45 degree elbows before it vents outside. 

I cannot seem to find a 4" inline blower that produces 380 cfm to help push the air out.

I've attached a picture for reference. Thanks!


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