Model domainValidated for 20"×20" faces with depths 1–4", pleat counts 12–60, media thickness < 2 mm, face velocity < 1000 fpm. Extrapolations beyond these bounds are flagged below.
Total filter ΔP
—
Media area
—
Pleat pitch β
—°
Pleat opening PO
—in
Volumetric flow
—CFM
Media velocity V₄
—fpm
Pleat count (input)
—pleats
Optimal pleat count
—pleats
Optimal PPI
—1/in
ΔP at optimum
—inWC
KP (pleat coef.)
—–
Pleating curve · ΔP vs. pleat count
U-curve · media + viscous + grating
ΔP breakdown by term
Fractional efficiency projectorPierce velocity-scaling · TSI 3160 data
›How it worksPaste two fractional efficiency datasets at different face velocities. The tool fits each curve to Pierce's quadratic model (ln Pen = A(ln D)² + B ln D + C), back-calculates the velocity exponent N, and projects the penetration curve to the media velocity V4 computed by this calculator.
ModeHEPA: single velocity exponent from U-curve fit (Pierce). Use for sub-micron 3160 data.
Face velocitycm/s
Face velocitycm/s
Ready · enter velocities, paste data, and fit