--- title: Curved Grilles and Diffusers; Design, Performance and Applications description: Explore the design, performance and applications of curved linear slot diffusers and grilles in modern HVAC systems for optimal indoor climate control. image: https://blog.swegon.com/hubfs/Swegon%20UKI/CIBSE%20BPAs%20(3).jpg --- [![](https://www.swegon.com/Static/img/logo.svg?v=3)](https://www.swegon.com/uk/) Menu - [Solutions & services](https://www.swegon.com/uk/solutions-and-services/) - [Products>](https://www.swegon.com/uk/products/) - [References & Insights](https://www.swegon.com/uk/references-and-insights/) - [Support & Software](https://www.swegon.com/uk/support/) - [Sustainability](https://www.swegon.com/uk/sustainability/) - [Why Swegon?](https://www.swegon.com/uk/why-swegon/) - [Product Search](https://www.swegon.com/uk/product-search-result/) - [Document Search](https://www.swegon.com/uk/support/find-documents/) - [Careers](https://www.swegon.com/uk/careers/) - United Kingdom - [Contact](https://www.swegon.com/uk/contact/) ## Choose a market [Or visit our global site](https://www.swegon.com) - 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[![Åsa Norén-Lundh](https://blog.swegon.com/hs-fs/hubfs/A%CC%8Asa%20Nore%CC%81n-Lundh.webp?width=75&name=A%CC%8Asa%20Nore%CC%81n-Lundh.webp) Åsa Norén-Lundh 4](https://blog.swegon.com/uk/author/åsa-norén-lundh) - [![Åsa Norén-Lundh](https://blog.swegon.com/hs-fs/hubfs/Blog%20Authors/SE-SV%20-%20PRO%20-%20BACV/%C3%85sa%20Nor%C3%A9n-Lundh.png?width=75&name=%C3%85sa%20Nor%C3%A9n-Lundh.png) Åsa Norén-Lundh 4](https://blog.swegon.com/uk/author/åsa-norén-lundh) - [![Åsa Norén-Lundh](https://blog.swegon.com/hs-fs/hubfs/AsaLN.jpg?width=75&name=AsaLN.jpg) Åsa Norén-Lundh 1](https://blog.swegon.com/uk/author/åsa-norén-lundh-1) Explore - - - [All About Indoor Climate](https://blog.swegon.com/uk?hsLang=en-gb) Subscribe Share - - - Explore Share Subscribe [« go back](https://blog.swegon.com/uk) # Curved Grilles and Diffusers; Design, Performance and Applications [Dan Jones](https://blog.swegon.com/uk/author/dan-jones) Mar 25, 2026 Curved Grilles and Diffusers; Design, Performance and Applications 3:45 **Curved Grilles and Diffusers; Design, Performance and Applications** In HVAC design, architects and engineers are constantly balancing aesthetics, comfort and performance. One component that checks all three boxes are **curved linear slot diffuser and grilles**. Sleek, adaptable and highly efficient; curved diffusers are becoming a preferred choice in contemporary commercial and architectural spaces. This blog explores what curved linear slot diffusers and grilles are, how they work, where they are applied & how to measure up. **What Is a Curved Linear Slot Diffuser?** A curved linear slot diffuser is an air distribution device designed to supply or return air through narrow, continuous slots that follow a curved path. Unlike traditional straight diffusers, these units can be manufactured to match circular, radial or custom curved architectural features. They are installed in ceilings in a ‘fan curve’ configuration for supply air, return air, or both. The diffusers geometry allows it to blend seamlessly into architectural designs while delivering controlled and even airflow. Available model types are FLOWBAR and CS (continuous slot): [https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/ceiling-diffusers/flowbar-c/?unit=m3s](https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/ceiling-diffusers/flowbar-c/?unit=m3s) [https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/ceiling-diffusers/cs-c/?unit=m3s](https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/ceiling-diffusers/cs-c/?unit=m3s) ![Curved diffusers](https://blog.swegon.com/hs-fs/hubfs/Swegon%20UKI/Curved%20diffusers.jpg?width=2000&height=438&name=Curved%20diffusers.jpg) **What Is a Curved Grille?** Much like linear slot diffusers a curved linear grille is an air distribution device designed to supply or return air however due to the design we can be a little more creative and install in ceilings, walls and ducts. Grilles can be manufactured in configurations ‘fan curve’, convex or concave curve, convex or concave barrel curve to match architectural features such as domes, columns, atriums or rounded ceilings. Available model types are AIRLINE series and URBAN series: [https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/duct-diffusers/urban/?unit=m3s](https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/duct-diffusers/urban/?unit=m3s) [https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/extract-air-diffusers/airline-series/?unit=m3s](https://www.swegon.com/uk/products-and-services/room-units/air-diffusers-grilles/extract-air-diffusers/airline-series/?unit=m3s) **What is the Application ?** One of the biggest advantages of curved linear slot diffusers is their ability to conform to complex architectural shapes. They complement curved ceilings, circular layouts and modern interior designs without interrupting visual flow. They are widely used in spaces where both performance and appearance matter: **How do we measure up?** Once we have selected the type and configuration of product we need to calculate the curvature - for the most common type, the flat ‘fan curve’, you will need to provide the **centre line radius** and **arc length,** which can be obtained from an engineering drawing. When it comes to the concave/convex curves, the **face radius** and **arc length** are required. It’s important to make a note of where the radius is taken from to avoid any costly mistakes. ![Curved diffusers (1)](https://blog.swegon.com/hs-fs/hubfs/Swegon%20UKI/Curved%20diffusers%20(1).jpg?width=2000&height=438&name=Curved%20diffusers%20(1).jpg) If engineered drawings are not available, a secondary route could be to take field measurements. Measuring the radius and arc length of the curvature on site can be challenging. A simpler approach is to measure the rise and chord length, both of which are straight-line dimensions. These dimensions will allow us to calculate the radius and arc length. ![Picture6](https://blog.swegon.com/hs-fs/hubfs/Swegon%20UKI/Picture6.png?width=597&height=187&name=Picture6.png) Here are some examples of curved grilles and diffusers in situ:![Picture8-1](https://blog.swegon.com/hs-fs/hubfs/Swegon%20UKI/Picture8-1.jpg?width=602&height=345&name=Picture8-1.jpg)![Picture10](https://blog.swegon.com/hs-fs/hubfs/Swegon%20UKI/Picture10.jpg?width=600&height=400&name=Picture10.jpg)![Picture9](https://blog.swegon.com/hs-fs/hubfs/Swegon%20UKI/Picture9.jpg?width=1031&height=1376&name=Picture9.jpg)![Picture7-1](https://blog.swegon.com/hs-fs/hubfs/Swegon%20UKI/Picture7-1.jpg?width=464&height=619&name=Picture7-1.jpg) Topics: - [Room Units](https://blog.swegon.com/uk/tag/room-units) - - - [![Dan Jones](https://blog.swegon.com/hs-fs/hubfs/dan_jones.jpg?width=200&name=dan_jones.jpg)](https://blog.swegon.com/uk/author/dan-jones) [Dan Jones](https://blog.swegon.com/uk/author/dan-jones) Dan Jones is the Head of Sales for Waterloo Air Products Ltd. He has 11 years’ experience in the HVAC Industry. At Swegon, Waterloo are responsible for product areas grilles, diffusers, chilled beams, VAV units & attenuators with a focus on indoor air quality & sustainability. ## Recommended reading - [Room Units](https://blog.swegon.com/uk/tag/room-units) ### [Andy Dines](https://blog.swegon.com/uk/author/andy-dines) ## [The Benefits of Selection Tools](https://blog.swegon.com/uk/the-benefits-of-selection-tools?hsLang=en-gb) In this blog post, we look at how Andy Dines, Digital Product … - [Room Units](https://blog.swegon.com/uk/tag/room-units) - [Energy Efficiency](https://blog.swegon.com/uk/tag/energy-efficiency) ### [Tobias Nordström](https://blog.swegon.com/uk/author/tobias-nordström) ## [Chilled beams re-invented: Maintaining performance in a world of variable airflow](https://blog.swegon.com/uk/chilled-beams-re-invented-maintaining-performance-in-a-world-of-variable-airflow-2?hsLang=en-gb) For decades, one of the strongest selling points of chilled beams has … - [Room Units](https://blog.swegon.com/uk/tag/room-units) ### [Welat Han](https://blog.swegon.com/uk/author/welat-han) ## [Which ventilation principle should I choose?](https://blog.swegon.com/uk/which-ventilation-principle-should-i-choose-1?hsLang=en-gb) To achieve an optimal indoor climate, it is important to choose the … Get updates from the blog directly to your inbox. #### Get to know us - [Why Swegon?](https://www.swegon.com/uk/why-swegon/) - [Solutions & services](https://www.swegon.com/uk/solutions-and-services/) - [Products](https://www.swegon.com/uk/products/) - [References & Insights](https://www.swegon.com/uk/references-and-insights/) - [Support & Software](https://www.swegon.com/uk/support/) - [BlueBox Chiller ERP](http://www.blueboxcooling.com/) - [Sustainability](https://www.swegon.com/uk/sustainability/) #### More Swegon - [About us](https://www.swegon.com/uk/about-swegon/) - [Our Brands](https://www.swegon.com/uk/about-swegon/our-brands/) - [Contact](https://www.swegon.com/uk/contact/) - [Careers](https://www.swegon.com/uk/careers/) - [Information for suppliers](https://www.swegon.com/uk/contact/suppliers/) - [Swegon Designer Suite](https://sds.swegon.com/) - [Swegon Air Academy](https://www.swegonairacademy.com/en/) #### Subscribe to our blog [![](https://www.swegon.com/siteassets/logos/swegon-logo-white.svg)](https://www.swegon.com/uk/) Swegon Ltd, 5 Charterpoint Way, Ashby-de-la-Zouch Leicestershire LE65 1NF - [Privacy statement](https://www.swegon.com/uk/privacy-policy/) - [Cookies](https://www.swegon.com/uk/cookies/) - [Processing personal data](https://www.swegon.com/uk/privacy-policy/processing-personal-data/) - [Vulnerability disclosure policy](https://www.swegon.com/uk/vulnerability-disclosure-policy/) - [![Youtube](https://www.swegon.com/Static/img/youtube.svg)](https://www.youtube.com/user/SwegonAB) - [![Linkedin](https://www.swegon.com/Static/img/linkedin.svg)](https://www.linkedin.com/company/swegon-ab/) - [![Facebook](https://www.swegon.com/Static/img/facebook.svg)](https://www.facebook.com/swegongroup)