Circular Diffusers

£ 68.13 68.13 GBP £ 68.13

£ 68.13

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Circle Diffusers

These circular diffusers are ideal for ceilings in residential and smaller commercial properties.  These plaster-in round ceiling vents can be fitted from beneath the plasterboard ceiling.

The Ventmann Circular Diffuser is a high-quality, round ceiling vent that can be used in a variety of applications. It is made of durable materials and features a sleek, modern design. The round diffuser is easy to install and use, and it can be adjusted to provide a variety of airflow patterns.


  • Made of gypsum - a durable material
  • Circular diffuser with a sleek, modern design
  • Easy to install and use
  • Adjustable airflow patterns


  • Improves air quality as part of a full ventilation system
  • Can help provide a comfortable and healthy environment
  • Reduces noise levels
  • Increases energy efficiency


  • Home use
  • Office use
  • Industrial use
  • Commercial use

Inaudible Flow Rates - Circular Diffusers

The following airflows give a noise level of 17dB.  Installers often use 25dB as the level of inaudible noise.  We use a lower figure for our circular air diffuser to allow for other fixings such as dampers and other constrictions upstream of the round ceiling diffuser and also to allow for some margin of error.

NameModelSpigot SizeL/sm3/hr
Circular DiffuserCircle 100/125100mm or 125mm1967
Circular DiffuserCircle 160160 mm2486
Circular DiffuserCircle 200/250200mm or 250mm39140


Spigot Size 100mm or 125mm or 160mm or 200mm or 250mm