Answer Posted / sd.muthahar basha

Is the question asked for measuring a duct or designing a
duct...
(a) to measure a duct a scale or tape is sufficient
and
(b)to design a duct Mc Quay`s duct sizer software is more
than sufficient...
there are three methods for designing a duct
1.Equal fiction method
2.static regain method
3.velocity reduction method

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