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Circular air diffuser for supply air in rooms with visible duct work

Circular supply air terminal, complete with painted circular commissioning box. Designed for installation in rooms without suspended ceilings. Suitable for constant or variable flow. The specially designed air track perforation allows air supply at large under temperatures and large air flows with low sound levels.

  • Guide vane perforations
  • Designed for rooms without suspended ceilings
  • Short throw length
  • Low installation height
  • Removable damper
  • Cleanable
  • Standard colour White RAL 9003
    • 5 alternative standard colours
    • Other colours upon request

Technical specifications


LOCKZONE Free   l/s  
Size 25 dB(A) 30 dB(A) 35 dB(A)
125 29 37 59
160 40 52 70
200 70 86 110
250 96 115 145
315 165 180 230

Data are valid for a total pressure drop of 50 Pa.

*) Lp10A = Sound pressure incl. A-filter with 4 dB room attenuation and 10 m2 room absorption area.

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Document Article Document type Size Format Download
Overview - Air diffusers Air diffusers Brochure 3.52MB pdf
Product description - Air diffusers & dampers Air diffusers & dampers Brochure 684.3kB pdf
Exposed circular ceiling terminal LOCKZONE Free a ProductSheet 796.94kB pdf
Building product declaration LOCKZONEFa Quality 106.08kB pdf
Installation, commissioning, maintenance LOCKZONE Free a Instruction 816.8kB pdf