Take width x Height of the plenum, Calculate Equivalent Diameter, Then for the specified air flow rate, Find the Static loss factor( feet / 100 feet of WC). then Calculate Friction Head ie,
((Feet/100 ft of WC x Length of the plenum)/100)
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refer to TROX
You cannot "calculate" the front of a box. You can calculate its dmensions, or its area but calculating it does not make sense. As for calculating its size or area, the answer will depend on what information you have and what you require.
two times the length of the box plus height
how to calculate carton price
you do length times width