<?xml version="1.0" encoding="UTF-8" standalone="no"?><?Xpress productLine="ncc-clause" ?><clause xmlns:xt="urn:xpressauthor:trackchanges" id="_fa08cef0-0c6d-45f0-9397-e7a05083201b" outputclass="ncc-clause"><sptc><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:08:00" xt:id="b0485a1c-5d4c-4bbe-9d4e-cb483b02b5c8"/>S46C2<xt:insText xt:action="end" xt:id="b0485a1c-5d4c-4bbe-9d4e-cb483b02b5c8"/></sptc><title id="_8e7d3304-2126-4e84-ac1f-a20298cbeb06"><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:08:00" xt:id="0c775671-80cc-4602-90e3-ef09730f33e1"/>Calculation of fan performance ratio<xt:insText xt:action="end" xt:id="0c775671-80cc-4602-90e3-ef09730f33e1"/></title><archive-num><placeholder outputclass="placeholder">[ARCHIVE]</placeholder></archive-num><subclause id="_9627927e-d80b-4ec7-b995-e0c4616e627b" outputclass="subclause"><title id="_aa3f3724-1e28-4e00-96c6-fe3d9e65372f">SubClause</title><num><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:08:00" xt:id="9347c2a3-2e83-418a-af27-668ab3224fc3"/>1<xt:insText xt:action="end" xt:id="9347c2a3-2e83-418a-af27-668ab3224fc3"/></num><p><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:08:00" xt:id="bc1eac6b-d04e-4522-9645-c3cf6ce1350b"/>The fan power ratio for an individual fan must be calculated in accordance with the following formula:<xt:insText xt:action="end" xt:id="bc1eac6b-d04e-4522-9645-c3cf6ce1350b"/></p><equation-block height="51" heightdpi="96" id="_569bb5f5-5fc2-43c8-b873-e4831fcb417b" width="77" widthdpi="96" xt:author="Ian Findlay" xt:dateTime="2024-09-02T11:59:36" xt:type="insert"><mathML><!-- MathType@Translator@5@5@MathML2 (no namespace).tdl@MathML 2.0 (no namespace)@ --><math> <semantics>  <mrow>   <mi>F</mi><mi>P</mi><msub>    <mi>R</mi>    <mrow>     <mi>i</mi><mi>n</mi><mi>d</mi><mi>i</mi><mi>v</mi><mi>i</mi><mi>d</mi><mi>u</mi><mi>a</mi><mi>l</mi><mi>f</mi><mi>a</mi><mi>n</mi></mrow>   </msub>   <mo>=</mo><mfrac>    <mrow>     <msub>      <mi>P</mi>      <mrow>       <mi>d</mi><mi>p</mi></mrow>     </msub>     </mrow>    <mrow>     <msub>      <mi>P</mi>      <mrow>       <mi>r</mi><mi>f</mi></mrow>     </msub>     </mrow>   </mfrac>   <mi>F</mi><mi>P</mi><mi>R</mi></mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOraiaadc  facaWGsbWaaSbaaSqaaiaadMgacaWGUbGaamizaiaadMgacaWG2bGa  amyAaiaadsgacaWG1bGaamyyaiaadYgacaWGMbGaamyyaiaad6gaae  qaaOGaeyypa0ZaaSaaaeaacaWGqbWaaSbaaSqaaiaadsgacaWGWbaa  beaaaOqaaiaadcfadaWgaaWcbaGaamOCaiaadAgaaeqaaaaakiaadA  eacaWGqbGaamOuaaaa@4E26@  </annotation> </semantics></math><!-- MathType@End@5@5@ --></mathML><image content-type="gif">R0lGODlhmgAxAPAAAP///wAAACwAAAAAmgAxAAAC/4SPqcvtD6OctNqLs968+w+G4kiW5omm6sq2
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MDIGCQAAAAAAADs=</image></equation-inline> = the fan power ratio for the fan; and<xt:insText xt:action="end" xt:id="88210ff4-2f53-4550-8b6f-6e8d990c5a18"/></li><li id="_486a2de1-9c72-4331-8382-0f7e3b20e49e" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:10:25" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-01T16:04:00" xt:id="cc89d39c-067f-47ab-92c4-562682abf078"/><equation-inline alignEquation="none" height="26" heightdpi="96" id="_a480c87b-7685-4f08-9ffb-38b66ade13fe" width="23" widthdpi="96"><mathML><math> <semantics>  <mrow>   <msub>    <mi>P</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   </mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuamaaBa  aaleaacaWGKbGaamiCaaqabaaaaa@38D6@  </annotation> </semantics></math></mathML><image content-type="gif">R0lGODlhFgAZAPAAAP///wAAACwAAAAAFgAZAAACMoSPqcvtD6N8odppAtKT5554kCiOVklhobot
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VHlwZUBFbmRANUA1QCAtLT4AIf8LTWF0aFR5cGUwMDIGCQAAAAAAADs=</image></equation-inline> = the input power of the reference fan at duty point, calculated in accordance with (4); and<xt:insText xt:action="end" xt:id="cf93063d-9dbc-41be-8087-b1ecb0f25a16"/></li></ol></subclause><subclause id="_4828c377-436d-4d0c-9e00-0a87f0a21334" outputclass="subclause" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:21:48" xt:type="insert"><title id="_3f34eb09-eb99-4c39-9cd6-1e9fb614f3fe" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:21:48" xt:type="insert"><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T02:21:00" xt:id="dad778a3-c9ec-4e95-9a91-d103e5038fef"/>SubClause<xt:insText xt:action="end" xt:id="dad778a3-c9ec-4e95-9a91-d103e5038fef"/></title><num xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:21:48" xt:type="insert"><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:21:00" xt:id="00c5dd4e-2685-4855-ba1a-9d088ccd142d"/>2<xt:insText xt:action="end" xt:id="00c5dd4e-2685-4855-ba1a-9d088ccd142d"/></num><p xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:21:48" xt:type="insert"><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:22:00" xt:id="d4cc3e30-6a42-4be9-bc28-4ed840e71a37"/>The average fan power ratio for multiple fans must be calculated in accordance with the following formula:<xt:insText xt:action="end" xt:id="d4cc3e30-6a42-4be9-bc28-4ed840e71a37"/></p><equation-block height="57" heightdpi="96" id="_b09d2513-0048-42a5-8824-1063658fda68" width="88" widthdpi="96" xt:author="Ian Findlay" xt:dateTime="2024-09-02T12:00:18" xt:type="insert"><mathML><!-- MathType@Translator@5@5@MathML2 (no namespace).tdl@MathML 2.0 (no namespace)@ --><math> <semantics>  <mrow>   <mi>F</mi><mi>P</mi><msub>    <mi>R</mi>    <mrow>     <mi>a</mi><mi>v</mi><mi>e</mi><mi>r</mi><mi>a</mi><mi>g</mi><mi>e</mi></mrow>   </msub>   <mo>=</mo><mfrac>    <mrow>     <mstyle displaystyle="true">      <msub>       <mo>∑</mo>       <mrow>        <mi>a</mi><mi>p</mi><mi>p</mi><mi>l</mi><mi>i</mi><mi>c</mi><mi>a</mi><mi>b</mi><mi>l</mi><mi>e</mi><mi>f</mi><mi>a</mi><mi>n</mi><mi>s</mi></mrow>      </msub>      <mrow>       <msub>        <mi>P</mi>        <mrow>         <mi>d</mi><mi>p</mi></mrow>       </msub>       </mrow>     </mstyle></mrow>    <mrow>     <mstyle displaystyle="true">      <msub>       <mo>∑</mo>       <mrow>        <mi>a</mi><mi>p</mi><mi>p</mi><mi>l</mi><mi>i</mi><mi>c</mi><mi>a</mi><mi>b</mi><mi>l</mi><mi>e</mi><mi>f</mi><mi>a</mi><mi>n</mi><mi>s</mi></mrow>      </msub>      <mrow>       <msub>        <mi>P</mi>        <mrow>         <mi>r</mi><mi>f</mi></mrow>       </msub>       </mrow>     </mstyle></mrow>   </mfrac>   </mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOraiaadc  facaWGsbWaaSbaaSqaaiaadggacaWG2bGaamyzaiaadkhacaWGHbGa  am4zaiaadwgaaeqaaOGaeyypa0ZaaSaaaeaadaaeqaqaaiaadcfada  WgaaWcbaGaamizaiaadchaaeqaaaqaaiaadggacaWGWbGaamiCaiaa  dYgacaWGPbGaam4yaiaadggacaWGIbGaamiBaiaadwgacaWGMbGaam  yyaiaad6gacaWGZbaabeqdcqGHris5aaGcbaWaaabeaeaacaWGqbWa  aSbaaSqaaiaadkhacaWGMbaabeaaaeaacaWGHbGaamiCaiaadchaca  WGSbGaamyAaiaadogacaWGHbGaamOyaiaadYgacaWGLbGaamOzaiaa  dggacaWGUbGaam4Caaqab0GaeyyeIuoaaaaaaa@63AA@  </annotation> </semantics></math><!-- MathType@End@5@5@ --></mathML><image content-type="gif">R0lGODlhsQA4APAAAP///wAAACwAAAAAsQA4AAAC/4SPqcvtD6OctNqLs968+w+G4kiW5omm6sq2
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Ow==</image></equation-block><p xt:author="Ian Findlay" xt:dateTime="2024-09-01T16:09:57" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-01T16:10:00" xt:id="49e47655-ab70-4545-8a4a-d100b5008074"/>where—<xt:insText xt:action="end" xt:id="49e47655-ab70-4545-8a4a-d100b5008074"/></p><ol outputclass="alpha"><li id="_f3faa02c-e7c2-4570-b34d-d60e63d44374" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:22:47" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-01T16:11:00" xt:id="81c2374c-63a8-4731-b9b4-6224ec66b2c8"/><equation-inline alignEquation="none" height="26" heightdpi="96" id="_048c690e-636e-4603-9c93-1bab1ce2bd7b" width="64" widthdpi="96"><mathML><math> <semantics>  <mrow>   <mi>F</mi><mi>P</mi><msub>    <mi>R</mi>    <mrow>     <mi>a</mi><mi>v</mi><mi>e</mi><mi>r</mi><mi>a</mi><mi>g</mi><mi>e</mi></mrow>   </msub>   </mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamOraiaadc  facaWGsbWaaSbaaSqaaiaadggacaWG2bGaamyzaiaadkhacaWGHbGa  am4zaiaadwgaaeqaaaaa@3F18@  </annotation> </semantics></math></mathML><image content-type="gif">R0lGODlhQAAZAPAAAP///wAAACwAAAAAQAAZAAACf4SPqcvtD6OctNqLs968gwCGwSGCpOhNI4ms
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bWF0aD48IS0tIE1hdGhUeXBlQEVuZEA1QDVAIC0tPgAh/wtNYXRoVHlwZTAwMgYJAAAAAAAAOw==</image></equation-inline> = the average fan power ratio for more than one fan; and<xt:insText xt:action="end" xt:id="81c2374c-63a8-4731-b9b4-6224ec66b2c8"/></li><li id="_dd2cccc5-56e9-4026-a0ae-30a4c5b1798d" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:23:22" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-01T16:11:00" xt:id="1dbb7b87-83c7-4c75-a385-e373f9c5aae0"/><equation-inline alignEquation="none" height="26" heightdpi="96" id="_4f4881ac-328e-4c41-8e1f-1013cb552ae8" width="23" widthdpi="96"><mathML><math> <semantics>  <mrow>   <msub>    <mi>P</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   </mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamiuamaaBa  aaleaacaWGKbGaamiCaaqabaaaaa@38D6@  </annotation> </semantics></math></mathML><image content-type="gif">R0lGODlhFgAZAPAAAP///wAAACwAAAAAFgAZAAACMoSPqcvtD6N8odppAtKT5554kCiOVklhobot
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ADs=</image></equation-inline><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:31:00" xt:id="da0d527d-c1ce-4786-b224-b2b0185ba6f5"/> = the <xt:insText xt:action="end" xt:id="da0d527d-c1ce-4786-b224-b2b0185ba6f5"/><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-02T12:05:00" xt:id="15d13a7e-0799-4aef-a2d3-ca91157f28b7"/>static <xt:insText xt:action="end" xt:id="15d13a7e-0799-4aef-a2d3-ca91157f28b7"/><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:31:00" xt:id="cf486924-c70f-4ad3-ae82-fa332ba1a8e4"/>pressure <xt:insText xt:action="end" xt:id="cf486924-c70f-4ad3-ae82-fa332ba1a8e4"/><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-01T16:22:00" xt:id="4bcf840f-bbc0-49ae-a564-fc5ee6817014"/>(Pa)<xt:insText xt:action="end" xt:id="4bcf840f-bbc0-49ae-a564-fc5ee6817014"/><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:31:00" xt:id="ef478d87-3bc9-4f32-b822-0e8796f9311b"/> <xt:insText xt:action="end" xt:id="ef478d87-3bc9-4f32-b822-0e8796f9311b"/><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-02T12:05:00" xt:id="ac1ebf53-004e-4aec-bc18-4d3186e07d2d"/>for installation type A or C, or total pressure (Pa) for installation type B or D, <xt:insText xt:action="end" xt:id="ac1ebf53-004e-4aec-bc18-4d3186e07d2d"/><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:31:00" xt:id="f304c266-732c-4229-88be-a340fd9502b7"/>at the point on the applicable fan curve where the fan flow equals the duty flow; and<xt:insText xt:action="end" xt:id="f304c266-732c-4229-88be-a340fd9502b7"/></li><li xt:author="Jerome Samuel" xt:dateTime="2024-04-12T12:32:02" xt:type="insert"><equation-inline alignEquation="none" height="27" heightdpi="96" id="_23e541a8-e566-4c74-9826-2c6a11dc6384" width="25" widthdpi="96"><mathML><math> <semantics>  <mrow>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   </mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyuamaaBa  aaleaacaWGKbGaamiCaaqabaGccaWGrbWaaSbaaSqaaiaadsgacaWG  WbaabeaakiaadgfadaWgaaWcbaGaamizaiaadchaaeqaaOGaamyuam  aaBaaaleaacaWGKbGaamiCaaqabaGccaWGrbWaaSbaaSqaaiaadsga  caWGWbaabeaakiaadgfadaWgaaWcbaGaamizaiaadchaaeqaaOGaam  yuamaaBaaaleaacaWGKbGaamiCaaqabaaaaa@4A53@  </annotation> </semantics></math></mathML><image content-type="gif">R0lGODlhlgAZAPAAAP///wAAACwAAAAAlgAZAAAC/4SPqcvtD6OctNqLs968+w+G4kiW5ommKhW0
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AAETV2luQWxsQmFzaWNDb2RlUGFnZXMAEQVUaW1lcyBOZXcgUm9tYW4AEQNTeW1ib2wAEQVDb3Vy
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9BAPQ19BAPSPRfQqX0j0j0EA9BAPQPSPQX9I9BAPQSpfRF9F9F9F9F9BDwwBAAEAAQICAgIAAgAB
AQEAAwABAAQAAAoBAAIAg3AAAwAbAAALAQACAINkAAIAg3AAAAEBAAAAACH/C01hdGhUeXBlMDAz
/Dw/eG1sIHZlcnNpb249IjEuMCI/PjwhLS0gTWF0aFR5cGVAVHJhbnNsYXRvckA1QDVATWF0aE1M
MiAoQ2xpcGJvYXJkKS50ZGxATWF0aE1MIDIuMCAoQ2xpcGJvYXJkKUAgLS0+PG1hdGggeG1sbnM9
J2h0dHA6Ly93d3cudzMub3JnLzE5OTgvTWF0aC9NYXRoTUwnPjxtcm93Pjxtc3ViPjxtaT5wPC9t
aT48bXJvdz48bWk+ZDwvbWk+PG1pPnA8L21pPjwvbXJvdz48L21zdWI+PC9tcm93PjwvbWF0aD48
IS0tIE1hdGhUeXBlQEVuZEA1QDVAIC0tPgAh/wtNYXRoVHlwZTAwMgYJAAAAAAAAOw==</image></equation-inline> = the statis pressure (Pa) at the duty point for installation type A or C, or total pressure (Pa) at the duty point for installation type B or D; and<xt:insText xt:action="end" xt:id="7b4d1cd7-5025-4406-be8c-2d2463f0c22d"/></li><li id="_dbfc3c46-1a39-4d27-89a6-579b2bc301fa" xt:author="Ian Findlay" xt:dateTime="2025-02-24T14:34:57" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2025-02-24T14:35:00" xt:id="8d4d40ca-4de2-4cbe-8e1a-794ee47a42b8"/><equation-inline alignEquation="none" height="26" heightdpi="96" id="_acd5f025-c426-4db3-b98b-ad4101e5d330" width="25" widthdpi="96"><mathML><!-- MathType@Translator@5@5@MathML2 (no namespace).tdl@MathML 2.0 (no namespace)@ --><math> <semantics>  <mrow>   <msub>    <mi>Q</mi>    <mrow>     <mi>d</mi><mi>p</mi></mrow>   </msub>   </mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamyuamaaBa  aaleaacaWGKbGaamiCaaqabaaaaa@38D7@  </annotation> </semantics></math><!-- MathType@End@5@5@ --></mathML><image content-type="gif">R0lGODlhGQAZAPAAAP///wAAACwAAAAAGQAZAAACPoSPqcvtD6OcMNhAET6bdu4tXyVOIyidgNqo
LHOOljMbdfLal7izLwa84W6zDXBV0nWOx8zlmcFFh9Oq9VoAACH/C01hdGhUeXBlMDAx3wUBAAcH
RFNNVDcAARNXaW5BbGxCYXNpY0NvZGVQYWdlcwARBVRpbWVzIE5ldyBSb21hbgARA1N5bWJvbAAR
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j0JfQQD0EA9DX0EA9I9F9CpfSPSPQQD0EA9A9I9Bf0j0EA9BKl9EX0X0X0X0X0EPDAEAAQABAgIC
AgACAAEBAQADAAEABAAACgEAAgCDUQADABsAAAsBAAIAg2QAAgCDcAAAAQEAAAAAIf8LTWF0aFR5
cGUwMDP8PD94bWwgdmVyc2lvbj0iMS4wIj8+PCEtLSBNYXRoVHlwZUBUcmFuc2xhdG9yQDVANUBN
YXRoTUwyIChDbGlwYm9hcmQpLnRkbEBNYXRoTUwgMi4wIChDbGlwYm9hcmQpQCAtLT48bWF0aCB4
bWxucz0naHR0cDovL3d3dy53My5vcmcvMTk5OC9NYXRoL01hdGhNTCc+PG1yb3c+PG1zdWI+PG1p
PlE8L21pPjxtcm93PjxtaT5kPC9taT48bWk+cDwvbWk+PC9tcm93PjwvbXN1Yj48L21yb3c+PC9t
YXRoPjwhLS0gTWF0aFR5cGVARW5kQDVANUAgLS0+ACH/C01hdGhUeXBlMDAyBgkAAAAAAAA7</image></equation-inline> = the flow (m<sup id="_52220245-2aab-4d50-96ce-8bf6033de484">3</sup>/s), at the duty point; and<xt:insText xt:action="end" xt:id="8d4d40ca-4de2-4cbe-8e1a-794ee47a42b8"/></li><li id="_ea920a06-99c6-4012-a72b-baa70d3cb292" xt:author="Ian Findlay" xt:dateTime="2025-02-24T14:36:29" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2025-02-24T14:36:00" xt:id="cf6f88f9-2757-4e63-a7fc-671532dfdfed"/><equation-inline alignEquation="none" height="26" heightdpi="96" id="_a381c655-21bf-4b9f-a716-f8878c0642da" width="21" widthdpi="96"><mathML><!-- MathType@Translator@5@5@MathML2 (no namespace).tdl@MathML 2.0 (no namespace)@ --><math> <semantics>  <mrow>   <msub>    <mi>η</mi>    <mrow>     <mi>r</mi><mi>f</mi></mrow>   </msub>   </mrow>  <annotation encoding="MathType-MTEF">MathType@MTEF@5@5@+=  feaahCart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn  hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr  4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq=Jc9  vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x  fr=xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaeq4TdG2aaS  baaSqaaiaadkhacaWGMbaabeaaaaa@39B1@  </annotation> </semantics></math><!-- MathType@End@5@5@ --></mathML><image content-type="gif">R0lGODlhFQAZAPAAAP///wAAACwAAAAAFQAZAAACMoSPqcvtD6OctNoQAM4xb01x4CSKUBkeJoIp
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aFR5cGVARW5kQDVANUAgLS0+ACH/C01hdGhUeXBlMDAyBgkAAAAAAAA7</image></equation-inline>.<xt:insText xt:action="end" xt:id="cf6f88f9-2757-4e63-a7fc-671532dfdfed"/></li></ol></subclause><callout id="_5daf70e1-98c7-4a3e-9616-ccdcdeba0b40" xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:13:15" xt:type="insert"><callout-type ncc-info-type="info" xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:13:15" xt:type="insert"/><p xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:13:34" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:13:00" xt:id="433f2ff1-03c9-4ecf-9023-e2bd2bca60b2"/>Duty point refers to the design flow and pressure in the system served by the fan.<xt:insText xt:action="end" xt:id="433f2ff1-03c9-4ecf-9023-e2bd2bca60b2"/></p><p xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:13:50" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:13:00" xt:id="d0e592ff-8921-48d9-8738-af2af00f7be6"/>Selection point refers to the point where the selected fan curve intersects the system curve.<xt:insText xt:action="end" xt:id="d0e592ff-8921-48d9-8738-af2af00f7be6"/></p><p xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:14:24" xt:type="insert"><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:14:00" xt:id="cec0ee8d-f71a-4d98-bf2e-39b5a9e212b7"/>Operating point refers to the duty flow and pressure if the fan is a variable speed fan, or<xt:insText xt:action="end" xt:id="cec0ee8d-f71a-4d98-bf2e-39b5a9e212b7"/><xt:insText xt:action="start" xt:author="Jerome Samuel" xt:dateTime="2024-09-03T11:56:00" xt:id="b047f4d7-8007-49bd-adbc-62fd6b27f10a"/> to<xt:insText xt:action="end" xt:id="b047f4d7-8007-49bd-adbc-62fd6b27f10a"/><xt:insText xt:action="start" xt:author="Ian Findlay" xt:dateTime="2024-09-02T13:14:00" xt:id="f42218ca-8331-46a5-b61a-333158d8beb1"/> the point on the applicable fan curve where the fan flow equals the duty flow, if the fan is a fixed speed fan.<xt:insText xt:action="end" xt:id="f42218ca-8331-46a5-b61a-333158d8beb1"/></p><image-reference author="Ian Findlay" conref="/tmp/QppServer/Publishing/5e2c1f63-e589-4ce1-95e8-5c3e286a7aff/10146_0.1.0.xml" dateTime="2024-09-02T13:15:28" id="_4206ec56-0508-4962-8c44-eec8fe107ea2" type="insert"><num/><title id="_7227ba5f-c563-4996-993f-db78bf7745e1"/></image-reference></callout></clause>