Aesthetic kitchen with extract slot diffuser

Gypsum Diffusers – Line

Ventmann LINE diffusers set a new standard for slot diffusers. The modern and understated design adds elegance to any interior whilst providing excellent airflow characteristics.

Technical Information

A frameless gypsum linear slot diffuser suitable for plasterboard ceilings and walls. It is plastered in can be painted with the same paint as the rest of the surface, resulting in a completely seamless appearance. Once installed, the diffuser is permanently fixed into place without affecting ceiling height.

LINE diffuser delivers high entrainment airflow designed to mix with the existing air.

All LINE diffusers can be combined to create continuous linear designs with no line breaks – perfect for sleek, streamlined interior design.

Available in 1-slot, 2-slot or 3-slot models.

Price includes acoustic box.

  • Materials:

Gypsum composite body with black powder coated steel backing. Galvanised steel acoustic box.

  • Diffuser dimensions:

22.5mm diffuser depth

12mm or 18mm slot width

625, 1000, or 1250mm slot length

  • Supply or extract
  • Can be combined to create longer lengths if required
  • Includes acoustic box
Installing a round Ventmann frameless diffuser
Step 1


Make a slot in the ceiling or wall and insert the diffuser, connecting it to the supply or extract duct. Fasten the diffuser into place with the screws provided.

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Seamless air diffuser installation
Step 2


Seal the gap around the edges and level off to create a smooth surface all around the diffuser, leaving no visible lines, gaps or joints.

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Paintable round diffuser
Step 3


Finish the ceiling or wall as planned. The diffuser can be painted in the same way – no need for special paints, primers or treatments.

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Seamless and frameless gypsum ceiling diffuser
Step 4


A stylishly frameless Ventmann diffuser.

An instant classic.

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Technical specifications & 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.

Download tech specifications