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NZS 4202: 1 995 Issued June 1995 APPENDIX A - SURFACE AREA OF DUCTWORK Al This Appendix illustrates the method of calculating surface area of ductwork as req ui red by 25.4.3.3. --`,,``,,,,,,``,``,`,,,`,,,`,-`-`,,`,,`,`,,`--- Copyright Standards New Zealand Provided by IHS under license with SNZ Document provided by IHS Licensee=<strong>Unitec</strong> Inst of Technology/5911177001, 03/02/2005 18:31:52 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295.
Issued June 1995 NZS 4202: 1 995 All calculations are based on air stream size Surface area = P x L, where P = perimeter of largest end L = length of duct or fitting calculated as follows: Spring line STRAIGHT DUCT 150 mrnj Extent of splitter or damper L=L1tL2 JUNCTION O 91 (No splitter] L=L1 t L2 JUNCTION I (Intersection of straight ducts without splitters or dampers) (Any angle up to and including 90") Measure as straight ducts STRAIGHT DUCT TAP IN V Spring line L=L1 t L2 BEND* H L=L1 TRANSITION Spring line Extent of splitter or damper L.LltL2 JUNCTION Dimensions are to spring line of branch L =Li t L2 JUNCTION --`,,``,,,,,,``,``,`,,,`,,,`,-`-`,,`,,`,`,,`--- (Any angle up to and including 90") L.Li+Li ELBOW* * If over 90" to be considered two bends - one 90; the other the remainder I L -i .A IL;i.l L=L -1 + L2 + L3 JUNCTION Duct pieces not conforming with the above diagrams shall have the area calculated by applying the same principles. Lines in diagrams do not necessarily indicate the positions of joints in the ductwork. Splitters are not measured but are deemed to be covered by the foregoing formulae. Figure A l - Surface area of ductwork Copyright Standards New Zealand Provided by IHS under license with SNZ Document provided by IHS Licensee=<strong>Unitec</strong> Inst of Technology/5911177001, 03/02/2005 18:31:52 MST Questions or comments about this message: please call the Document Policy Group at 303-397-2295.
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NZS 4202: 1 995 Issued June 1995 SE
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Page 65 and 66: NZS 4202:1995 Issued June 1995 21.4
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Page 71 and 72: NZS 4202: 1 995 Issued June 1995 23
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Page 97 and 98: NZS 4282: 1 995 Issued June 1995 SE
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Page 107: NZS 4202: 1 995 Issued June 1995 SE
Page 111: NZS 4202: 1995 --`,,``,,,,,,``,``,`
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