Chapter hvac engineering Fundamentals: Part 1 Introduction

Part 2:
Air Distri-
bution,
1960
.)
inches of water per 100 ft of duct length, for a range of diameters and
mean velocities. This chart is based on an absolute duct surface rough-
ness
⑀
of 0.0003, the approximate value for galvanized steel sheets. It
is also based on standard air (70
⬚
F and 0.075 lb / ft
3
). Corrections
should be made for the roughness of other duct materials and for sig-
Design Procedures: Part 3
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