Kostenloser Luftfilter-Rechner
Dimensionieren Sie HLK-Filter nach Luftvolumenstrom und Anströmgeschwindigkeit.
CFM
ft/min
in
in
Filters Needed
2
Min Filter Face Area4.00 sq ft
Actual Face Velocity173 ft/min
Filters Needed vs System Airflow
Formel
## Filter Sizing **Face Area = CFM / Face Velocity** **Filters = Face Area / Single Filter Area** Keeping face velocity under 300 ft/min ensures good filtration and low pressure drop. Higher velocities reduce filter life and may blow dust through the media.
Lösungsbeispiel
1,200 CFM system, 300 ft/min max, using 20x25 inch filters.
- 01Min face area = 1200 / 300 = 4.0 sq ft
- 02Filter area = 20 x 25 / 144 = 3.47 sq ft
- 03Filters = ceil(4.0 / 3.47) = 2
- 04Actual velocity = 1200 / (2 x 3.47) = 173 ft/min
Häufig Gestellte Fragen
What is ideal filter face velocity?
For standard 1-inch filters: 250-350 ft/min. For 4-inch media filters: 200-300 ft/min. Lower velocities improve filtration and extend filter life.
How often should HVAC filters be replaced?
1-inch filters: every 1-3 months. 4-inch media filters: every 6-12 months. More frequently if you have pets or live in a dusty area.
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