6.4.1. Step twist outlet DS

For air distribution in assembly rooms with banked seating. Air supply from step front; circular shape, in three options.


Function / Kind DS-DD: Twist outlet
DS-RA: Radial outlet - (square face on request)
DS-BA: Floor outlet
Volume flow rate range
DS-DD-DN 63 ≤ 3.3 l/s [12 m3/h]
DS-DD-DN 100 ≤ 10 l/s [35 m3/h]
DS-RA-DN 100 ≤ 10 l/s [35 m3/h]
DS-BA-DN 150 ≤ 10 l/s [35 m3/h]
Sound power level ≤ 18 dB(A) ref. 10-12 W


  • For assembly rooms with floor steps, with and without fixed seating
  • Built into step front
  • Turbulent, radial discharge flow with intensive indoor air admixture resulting in rapid drop in jet velocity and fast temperature equalization
  • Installation in wooden or concrete steps 
  • Connection to pressurized plenum