22/10/2026
Is it LINE or PLINE?
At first glance, Ventmann LINE and PLINE diffusers look very similar.
Both are manufactured from gypsum. Both are plastered seamlessly into the ceiling. Both are available with 1, 2 or 3 slots.
But the way they manage airflow is different — and choosing the right one can make a significant difference to comfort and system performance.
PLINE – Designed for High-Performance Supply Air
PLINE, or Performance Line, is engineered specifically around airflow distribution.
Its curved internal profile directs supply air across the ceiling using the Coandă effect, helping distribute conditioned air more widely before it enters the occupied zone.
PLINE is particularly suited to:
✔ Living rooms
✔ Bedrooms
✔ Offices
✔ Open-plan spaces
✔ MVHR supply air
✔ Air-conditioning supply
✔ Areas where occupant comfort and draught reduction are important
LINE – Flexible, Discreet & Versatile
The classic Ventmann LINE diffuser uses straight-sided slots with an adjustable airflow pattern.
Available with 12 mm or 18 mm slots, LINE is ideal when you need flexibility, discreet architectural lines or extract ventilation.
LINE is particularly suited to:
✔ Kitchens and utility rooms
✔ Bathrooms
✔ Extract ventilation
✔ Long continuous diffuser runs
✔ Projects requiring the narrowest possible sightline
✔ Applications requiring airflow regulation and balancing
Why Choose Between Them?
You don't necessarily have to.
Many projects use PLINE for supply air in occupied spaces and LINE for extract air in kitchens, bathrooms and utility areas.
Once plastered and painted, both ranges integrate into the same architectural language — allowing supply and extract ventilation to remain visually consistent throughout the project.
What Do LINE & PLINE Have in Common?
✔ Frameless plaster-in gypsum construction
✔ 1, 2 or 3-slot configurations
✔ 625 mm, 1000 mm and 1250 mm lengths
✔ Compatible Ventmann plenum box options
✔ Suitable for ceilings and walls
✔ BIM/Revit resources available
✔ 5-Year Warranty
✔ Next-day UK delivery available on most products
Not Sure Which One You Need?
Don't specify based on appearance alone.
Airflow, pressure drop, noise levels, room use and diffuser position should all be considered when selecting the correct configuration.
Send us your drawings or airflow requirements and our technical team can help specify the right LINE or PLINE configuration for your project.
https://quotes.ventmann.co.uk/r/eHj
