Printable CFM Duct Chart
This one-page letter landscape sheet is for HVAC installers, technicians, and estimators who need a quick round duct airflow reference. It shows CFM by friction rate for smooth galvanized round duct with standard air. The chart includes diameter on the left and friction rate columns of 0.05, 0.06, 0.08, 0.10, and 0.15 in. w.c./100 ft. Sample rows include 4 in, 5 in, and 6 in with matching CFM values.
Free printable · PDF
- 1 page
- US Letter, landscape — choose “Fit to page” for A4
- PDF, 62 KB
Free for personal, family and classroom use.
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Use the diameter row to find the duct size, then read across to the friction rate you want. The numbers give CFM per friction rate, which helps with sizing, comparisons, and fast field checks without calculations.
Good for
- Check round duct airflow at a glance
- Compare CFM across friction rates
- Speed up duct sizing in the field
Tip: Print in landscape and keep it with your jobsite notes for fast lookup.
4 files · PDF, XLSX, DOCX
Get every sheet: Duct Sizing Reference Pack
This sheet plus 3 more in one download, with the editable Excel and Word files. Printable round duct CFM chart at five friction rates, rectangular equivalents table, an Excel duct sizing calculator and a room-by-room airflow worksheet.
$3.00 USD, one-time 4 files · about $0.75 each
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- 7-day refund
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