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Minor loss in air ducts based on a summarized minor loss coefficient and air flow velocity can be estimated with the diagram below:

Minor loss for some common ductwork components like bends, expansions, inlets and outlets can be estimated with the diagrams below.
The minor loss coefficients in 90o bends can be estimated with the diagram below.

The minor loss in bends 0 - 180o can be estimated with the equation
ξ0-180 = ξ90 α / 90 (1)
where
ξ0-180 = minor loss coefficient for the bend with the actual angle
ξ90 = minor loss coefficient for the 90o bend according the diagram above
α = angle of the actual bend
The minor loss coefficient in a 90o bend like the one below is 1.0.




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