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Air Diffusers Ltd.                             Unit 77, Enterprise Centre Michael Way, Warth Park Way, Raunds, 

+44 (0) 1933 697471


Frameless CIRCLE diffusers are the most versatile solution for every room and interior design style. It is the most popular choice, stylistically completely non-binding, blending perfectly with the environment.

Ventmann diffusers integrate seamlessly into your interior design, making no compromise between fresh air and clean design.

Like all Ventmann air distributors, products in the CIRCLE line can be plastered together with the wall or the ceiling and can be painted with the same paint as the entire surface. All CIRCLE standard models can be adapted to your needs.

  • 100mm or 125mm – these are the smallest standard connection nozzle diameters you can select.
  • 160mm – this is the medium diameter of the standard connection nozzle that you can select.
  • 200mm or 250mm – these are the largest standard connection nozzle diameters that you can select.
  • Industrial strength magnets – the diffuser cap is supported by magnets that do not lose their strength for 95 years.


Technical Information

A gypsum composite circular diffuser with a round face plate which attaches using our new click system to the base.

Our CIRCLE diffuser is suitable for plasterboard ceilings or walls. Once installed, the diffuser forms a permanent bond with the plasterboard, offering outstanding durability. It can be sanded and painted just like the surrounding surfaces. It leaves no visible frames or flanges between the diffuser and the surrounding surface, making it ideal for very clean and modern interior design styles.

CIRCLE diffusers are designed to provide a radial air pattern with high entrainment and air mixing, resulting in a more comfortable environment for all occupants.

CIRCLE can be installed on its own or arranged into groups if required.

Available in 100/125/160/200/250mm connector diameters.

  • Materials: Gypsum composite body, steel connector, rubber gasket and elastic fixing strap.
  • 45mm diffuser depth
  • Supply or extract
  • Suitable for short throw applications
  • Includes screws, fixing strap and plastic spacers

This is our most versatile unit. It fits the design of most rooms and provides comfortable air flow in majority of situations. CIRCLE, like all other frameless diffusers, can be used for both air supply and air extraction.

Multiple beautiful, sleek CIRCLE diffusers can be installed in a single room. You can order one of the standard CIRCLE diffusers from our shop.

Installation Guide

Ventmann diffusers are much more than an interior design solution: they are engineered to deliver comfortable airflow exactly where you need it most. For detailed technical specifications, download our full catalogue now.