| Material | sheet steel (galvanized) |
|---|---|
| Nennweiten (mm) | 100, 125, 140, 150, 160, 180, 200, 224, 250, 280, 300, 315, 355, 400, 450, 500, 80 |
| order example | SRP+DN+length (m) |
| Standard length (mm) | 2000, 3000 |
| duct box hood | YHF3000, for duct length up to 3 m |
Spiral duct, perforated
perforated spiral duct,
according to DIN EN 1506 or DIN EN 12237.
Length Tolerance: ±0.005L,
Outer diameter over the fold is approx. d + ~ 8 mm,
round perforation in staggered rows,
hole width 5 mm, hole spacing 7 mm,
Free cross-section approx. 34%,
drag coefficient ζ = 11.6,
Uniform radial flow at ΔPst ≥ 80 Pa,
corresponding to ≥ 24 m/s with an air density ϱ 1.2 kg/m3,
