Pressure and duct sizing tool
Duct sizes according to Part F pressure limits
Based on Approved Document F (2026 edition), Table 1.8. Answer a few questions and we'll recommend the smallest duct size that stays within your system's pressure budget.
What is the supply/extract volume for the system?
Pick a room type for the standard Part F continuous high rate, or enter your own figure
What type of system is this?
This determines your maximum allowed static pressure per Table 1.8
Diffuser pressure drop
Pick a typical preset or enter your fitting's actual figures if known (in Pascals)
What's the total duct length?
Straight-line run length in metres (excludes fittings/bends allowance)
Read more about ventilation ductwork
Interested in learning more?
Download the full brochure here to see ducting specifications, sizings, and technical data.
Download Technical Brochure
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