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That depends on the playground. But i would say that an average playground is about 100 feet by 100 feet. But that is just me.
30 ft.
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)
It is a length equivalent to 100 centimetres.