I have a low pressure 16"x8" duct that transitions to a 42"x4". The length of the transition is approx 18". The 42"x4" duct only runs for 24", and then there is another transition (18"long) back to the original 16"x8" There is an 8"x4" tap on the 42"x4" piece serving a 100 CFM diffuser. The remaining 16x8 downstream of the transition delivers a total of 500 CFM. See attached.
Any idea how much static is being lost in this fitting?
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