All toolsCalculatorsDuctworkSpecific Fan Power (SFP)
Specific Fan Power (SFP)
Check a ventilation system's specific fan power against Approved Document L Table 6.9.
The Ensign ToolboxSpecific Fan Power (SFP)Check a ventilation system's specific fan power against Approved Document L Table 6.9.
Fan power
W
All supply fans at design flow, including switchgear/control losses
W
All extract fans; 0 for a supply-only system
L/s
For an AHU use the greater of supply or extract flow
Compliance limit (ADL 2021 Table 6.9)
Existing-building limits are more lenient
W/(L·s)
Filled from Table 6.9 — choose “Custom limit” to edit
Enter the supply and extract fan power