One Systems PM4-M V4 - Manual (Page 12)

APPENDIX 1
Projected Area Values
The values below should be supplied to the specific pole manufacturer for safety
calculations. These values were determined by adding the projected areas of the
high frequency horns, the woofer cones and ports to the cross sectional area of
the front of each enclosure listed below. The EPA will vary based on wind
direction. The values shown are for wind directions directly into the front of the
enclosure and represent maximum values.
112/HTH …………………………… 600 in^2 (387,096mm^2)
212/HC…………………………… 600 in^2 (387,096mm^2)
312/HC…………………………… 804 in^2 (550,000mm^2)
CFA-2/HTH……………………… 855 in^2 (552,100mm^2)
118/HSB……………………….. 581 in^2 (375,000mm^2)