Shaping Modern Interiors
We design architectural diffusers that merge aesthetics, innovation, comfort, and timeless functionality.
About Us
Our Vision
We believe ventilation diffusers and grilles should be as aesthetically pleasing and durable as possible.
We understand how much you care about your design. That’s why we ensure the highest quality standards of our products, so you can be confident that Ventmann linear grilles and air diffusers are an excellent choice.
A hidden diffuser will mean that the eye will be drawn to what's important - your design.
Our Products
Manufactured in linear, round and square we have a solution for almost every situation. Our linear diffusers can be connected end to end to allow a continuous line across the entire surface whilst providing full-width air flow. We are very proud to announce that our latest range of coanda diffusers have won the prestigious Red Dot design award.
Our Service
Ventmann diffusers are much more than an interior design solution: they are engineered to deliver comfortable airflow exactly where you need it most. For our detailed technical specifications and installation guide, download our full catalogue now. The catalogue shows our slot linear diffuser range first, then other ceiling diffuser types of architectural grille for use in commercial and residential designs.
Blog posts

Frameless Ventilation Valves: The Complete UK Guide (Round, Square & Linear)
A frameless ventilation valve has no visible rim: the body is plastered into the ceiling and the face finishes flush. Sizes, airflow rates, Part F duties and how to install one.

Free HVAC Tools & Engineering Resources: 8 Calculators Worth Bookmarking
Eight free, browser-based HVAC tools worth bookmarking — cooling load, Part F ventilation and duct sizing calculators, refrigerant pre-charge, silencer selection, psychrometrics and more. No login needed.

Acoustic Box vs Thermo Box: Which Plenum Does Your Slot Diffuser Need?
Acoustic Box (GTG) or Thermo Box (VTBOX)? How Ventmann’s two plenum boxes differ — top entry vs side entry, noise reduction vs insulation — and which one your linear slot diffuser needs.
