Milnor 6458, Installation Manual

Page: 56 / 93

Pellerin Milnor Corporation
Figure 1. Round duct elbow fabrication
Elbow radius
Segmented elbows
Legend
D... Cross-section diameter
Rl. . . Long radius (Rl = 1.5 x
D*
Rs. . . Short radius (Rs = D)*
1... 6-segment to smooth elbow
- best
2... 3-segment elbow -
acceptable
3... 2-segment or right angle el-
bow - do not use
2.3.3. Vents
BNDDUI01.C11 0000086881 A.10 A.11 Released
Wind loads can contribute significantly to variations in the external pressure drop felt by dryers.
Only the vent designs identified with a check mark in the figure below.adequately counteract the
effect of wind load.
Do not use a screen in the vent for the main air inlet.
Figure 2. Vent Designs
3. Duct Layout and Pressure Drop Calculations
BNDDUI01.R01 0000086879 A.10 Released
3.1. Units of Measure Used in the Calculations
BNDDUI01.R02 0000086878 A.10 Released
Table 1. Units of Measure
Type of
Measurement
English Unit Metric Unit
Abbreviated
Term
Abbreviated
Term
Short length in inches (mm) millimeters
Long length ft feet (M)
meters
Air flow
scfm standard cubic feet
per minute (nlpm) normal liters
per minute
Air and Duct Requirements for Milnor ® Pass-through Dryers
52