Labconco Protector Premier 10040 Series User Manual page 70

Appendix G: VAV Open Area Guidelines
c. Free opening area
i. Multiply the width opening times the vertical opening (A x
ii. Divide this by 144 to arrive at square feet, and enter that
2. Determining bypass or "leakage" area
a. This is the opening width (A) times 0.34 inches (A x 0.34 = bypass
area).
Bypass area = ___________ square inches = D (sq in)
b. Divide this by 144 to arrive at square feet
Bypass area = ____________ square feet = D (sq ft)
3. Determining Total Effective Opening Area
a. This is the Free Opening Area plus the Bypass Opening Area
(C + D = Total Effective Opening Area)
Total Effective Area = _____________ square inches
Total Effective Area = _____________ square feet
* Industry standards call for sash height to be measured from the work surface, however, for the purposes of determining
free opening height, measurement is to be taken from the top of the lower airfoil sill to the bottom of the sash handle.
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B), and enter that here:
Free opening area = ___________ square inches = C (sq.in)
here:
Free opening area = ____________ square feet = C (sq.ft)
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