Balancing of a Water and Air System (PDF
Balancing of a Water and Air System (PDF
Balancing of a Water and Air System (PDF
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
19<br />
Flat Oval Duct Traverses<br />
For field readings, flat oval ducts may be traversed by two different methods depending<br />
on the dimensions <strong>of</strong> the duct.<br />
If the width <strong>of</strong> rectangle EF to GH as shown in Figure 3.4 is less than the diameter <strong>of</strong> the<br />
semi-circle (Line EG), then traverse as a circle using the Equal Area Method (Figure 3.1 or<br />
3.2) at (A-B) <strong>and</strong> (C-D). The area <strong>of</strong> the oval will be computed by adding the area <strong>of</strong> the<br />
circle to the area <strong>of</strong> the rectangle.<br />
If the width <strong>of</strong> rectangle EF to GH as shown in Figure 3.5 is greater than or equal to the<br />
diameter <strong>of</strong> the semi-circle (Line EG), then traverse as a rectangle (Figure 3.3). For the<br />
two semi-circles traverse the plane (A-B) <strong>and</strong> (C-D) using the spacing shown in round<br />
duct traverse (Figures 3.1 or 3.2). The area will be computed by adding the area <strong>of</strong> the<br />
circle to the area <strong>of</strong> the rectangle.<br />
19