Values of coefficient of entry Ce

Typical values of Ce are shown in Figures 3.46 to 3.52.

At about 20 m/s in duct. Ca is less at lower velocity Figure 3.46 Ce for plain open ended duct

Figure 3.50

Ce for rectangular hoods ratio 1 : 3

Values of coefficient of entry Ce At about 20 m/s in duct. Ce is less at lower velocity Figure 3.47 Ce for flanged open ended duct

Angle 0

Figure 3.51 Ce for rectangular hoods ratio 3 : 4

Figure 3.48 Ce for tapered hoods

Values of coefficient of entry Ce

0 mm	Hood mm	C.
150	Plain with 165 x 50 wheel	• 80 without wheel — 725 with wheel

	250 mm—►

For average hoods including the obstruction of grinding or buffing wheel take Ce at • 71

Figure 3.52 Ce for grinding wheel hoods

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