Static Pressure
Total external static pressure from duct elements.
Example
You enter
- Elements name Filter, dp in wc 0.1; name Coil, dp in wc 0.3; name Supply duct, dp in wc 0.2; name Return duct, dp in wc 0.1
You get
- Total external static pressure 0.7 in w.c.
Checked against published worked examples from: ACCA Manual D / ASHRAE Fundamentals.
Details, formula, and sources
Formula or tableTotal external static pressure = sum of element pressure drops (filter + coil + grille + register + duct path); compare the total with the AHU's rated TESP.
Source and editionManufacturer AHU rating data + ACCA Manual D, 3rd edition by name.
Free accessManufacturer technical bulletins free on each manufacturer site.
What governsEstimate. AHJ and licensed mechanical contractor govern. ACCA Manual J / D / S supersede rules of thumb.
API field nameselements, total_in_wc
- Filter / coil drops user-supplied or manufacturer-published valuesmanufacturer technical bulletin