Linear Slot Diffusers


£ 140.43

Circular Diffusers
Circular Diffusers
£ 68.13
£ 68.13

Linear Slot Diffusers

£ 140.43 140.43 GBP £ 140.43

£ 140.43

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Slot Diffusers

The Ventmann Linear Slot Diffuser is a high-quality, versatile diffuser that can be used in a variety of applications. The frameless slot diffuser is made of durable materials and features a sleek, modern design. These linear grilles are easy to install and use, and each slot linear diffuser can be adjusted to provide a variety of airflow patterns.  The frameless slot diffuser can be used as a ceiling diffuser or a wall diffuser depending on your requirements.


  • A modern grille diffuser made of durable materials
  • Sleek, modern design of slotted diffuser
  • Available in a range of sizes and options
  • Easy to install and use
  • Adjustable airflow patterns
  • A linear slot diffuser that can be installed on walls or ceilings
  • Ideal for use in homes, offices, and commercial spaces
  • Available in three lengths: 1250mm, 1000mm, and 625mm
  • Available with two slot gaps: 12mm and 18mm
  • Available with 1, 2, or 3 slots


  • A linear diffuser grille can Improve air quality by providing a wider flow
  • The frameless linear diffuser can help provide a comfortable and healthy environment
  • Reduces noise levels
  • Increases energy efficiency
  • With upstream filtering, the plaster in linear slot diffuser can help to reduce allergens and pollutants in the air
  • The plasterboard vent is the same material as its surrounding for a seamless finish


Standard fixing of our slot diffusers is by use of a standard plasterboard jointing compound which can then be sanded and painted. On new-build sites, the plenum and diffuser are normally hung together and the plasterboard then cut and introduced to the face of the diffuser.  Further instructions to install the hidden linear diffuser can be found on the video option above.

Inaudible Output Of Linear Slot Diffusers In Increasing Order

The following airflows for each linear supply diffuser give a noise level of 17dB.  Installers often use 25dB as the level of inaudible noise.  We use a lower figure for each hidden linear slot diffuser to allow for other fixings such as dampers and other constrictions upstream of the diffuser and also to allow for some margin of error.

NameModelLengthSlotsSlot WidthL/sm3/hrTotal opening area mm2
1 Slot Linear Diffuser62511262511239140 7,500 
1 Slot Linear Diffuser62511862511860215 11,250 
1 Slot Linear Diffuser1000112100011263225 12,000 
2 Slot Linear Diffuser62521262521272260 15,000 
1 Slot Linear Diffuser1250112125011276275 15,000 
1 Slot Linear Diffuser1000118100011896345 18,000 
2 Slot Linear Diffuser10002121000212117420 24,000 
1 Slot Linear Diffuser12501181250118119430 22,500 
2 Slot Linear Diffuser625218625218136490 22,500 
3 Slot Linear Diffuser625312625312142510 22,500 
2 Slot Linear Diffuser12502121250212146525 30,000 
2 Slot Linear Diffuser10002181000218219790 36,000 
3 Slot Linear Diffuser625318625318226815 33,750 
3 Slot Linear Diffuser10003121000312228820 36,000 
2 Slot Linear Diffuser12502181250218247890 45,000 
3 Slot Linear Diffuser125031212503122851025 45,000 
3 Slot Linear Diffuser100031810003183671320 54,000 
3 Slot Linear Diffuser125031812503184441600 67,500 

Slots 1 or 2 or 3
Length 625 or 1000 or 1250
Gap 12mm or 18mm
Accessory Products