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- Q4677824 subject Q8880462.
- Q4677824 abstract "Actual cubic feet per minute (ACFM) is a unit of volumetric capacity. It is commonly used by manufacturers of blowers and compressors. This is the actual gas delivery with reference to inlet conditions, whereas cubic foot per minute (CFM) is an unqualified term and should only be used in general and never accepted as a specific definition without explanation. Since the volumetric capacity refers to the volume of air or other gas at the inlet to the unit, it is often referred to as "inlet cubic feet per minute" (ICFM). Actual cubic feet per minute is the volume of gas flowing anywhere in a system independent of its density. If the system were moving air at exactly the "standard" condition, then ACFM would equal Standard cubic feet per minute (SCFM). However, this usually is not the case as the most important change between these two definitions is the pressure. To move air, either a positive pressure or a vacuum must be created. When positive pressure is applied to a standard cubic foot of air or other gas, it gets smaller. When a vacuum is applied to a standard cubic foot of gas, it expands. The volume of gas after it is pressurized or rarefied is referred to as its "actual" volume.The term cubic feet per minute (CFM) is ambiguous when it comes to the mass of gas that passes through a certain point because gas is compressible. If the pressure is doubled, then, for an ideal gas, the mass of the gas that passes by will also be double for the same rate of flow in cubic feet per minute. For instance, a centrifugal fan is a constant CFM device or a constant volume device, meaning that, at a constant fan speed, a centrifugal fan will pump a constant volume of air rather than a constant mass. This means that the air velocity in a system is fixed even though mass flow rate through the fan is not.".
- Q4677824 wikiPageExternalLink atmos.html.
- Q4677824 wikiPageExternalLink ACFM_to_SCFM_vs_ICFM.pdf.
- Q4677824 wikiPageExternalLink Compressed%20Air%20Energy%20Efficiency.pdf.
- Q4677824 wikiPageExternalLink scfm-acfm-icfm-d_1012.html.
- Q4677824 wikiPageExternalLink closer_look_air.htm.
- Q4677824 wikiPageExternalLink scfm_vs_acfm.shtml.
- Q4677824 wikiPageExternalLink ACFM-versus-SCFM.html.
- Q4677824 wikiPageExternalLink scfm.
- Q4677824 wikiPageExternalLink fluden.html.
- Q4677824 wikiPageExternalLink cfm.pdf.
- Q4677824 wikiPageExternalLink engltr4.pdf.
- Q4677824 wikiPageExternalLink scfm_v_acfm.htm.
- Q4677824 wikiPageExternalLink techtip2.htm.
- Q4677824 wikiPageExternalLink faqs.htm.
- Q4677824 wikiPageExternalLink gas-flow-calculator.
- Q4677824 wikiPageWikiLink Q102145.
- Q4677824 wikiPageWikiLink Q1058834.
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- Q4677824 wikiPageWikiLink Q483242.
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- Q4677824 wikiPageWikiLink Q8067817.
- Q4677824 wikiPageWikiLink Q81809.
- Q4677824 wikiPageWikiLink Q8880462.
- Q4677824 wikiPageWikiLink Q925.
- Q4677824 comment "Actual cubic feet per minute (ACFM) is a unit of volumetric capacity. It is commonly used by manufacturers of blowers and compressors. This is the actual gas delivery with reference to inlet conditions, whereas cubic foot per minute (CFM) is an unqualified term and should only be used in general and never accepted as a specific definition without explanation.".
- Q4677824 label "Actual cubic feet per minute".