Convert Liters per Square Meter per Second to ft/min

Formula

ft/min = L/(m²·s) × 0.1968503937008

or ft/min = L/(m²·s) ÷ 5.08

Derivation from SI units:

• 1 L/(m²·s) = 10⁻³ m³ ÷ (1 m² × 1 s) = 10⁻³ m/s = 1 mm/s
• 1 ft/min = 0.3048 m ÷ 60 s = 0.00508 m/s
• 1 L/(m²·s) = 0.001 m/s ÷ 0.00508 m/s per ft/min = 0.1968503937008 ft/min

Both units are defined exactly, so the factor is exact. Liter per Square Meter per Second definition: liter per square meter per second; Foot per Minute definition: foot per minute.

Worked examples

1. A reading of 75 L/(m²·s) converts to 14.76377953 ft/min.
   75 L/(m²·s) × 0.1968503937 = 14.76377953 ft/min
2. A value of 500 L/(m²·s) is 98.42519685 ft/min.
   500 L/(m²·s) × 0.1968503937 = 98.42519685 ft/min

Where it's used

Liters per Square Meter per Second are used for fabric and nonwoven air permeability (EN ISO 9237 at 100 Pa or 200 Pa), while feet per minute appear in fume hood face velocity (commonly 80–120 fpm). Both measure face velocity and air permeability (volumetric flow per unit area), so the conversion is a fixed factor.

Liter per Square Meter per Second to other face velocity & air permeability units

Frequently asked questions

Sources

• ISO 9237:1995 Textiles — Determination of the permeability of fabrics to air, International Organization for Standardization , air permeability expressed per unit area.
• The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 8 (litre).
• Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "foot per minute (ft/min)".

Last reviewed: 2026-10-15. Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.