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Product Information „Intelmann® Internal Grille for Supply and Exhaust Ventilation in Pipelines“The Intelmann® internal grille serves as an aesthetically pleasing air outlet or inlet for supply and exhaust air systems. It has been specially designed for installation in spiral ducting and is suitable for use in residential rooms, commercial buildings, technical rooms, as well as industrial ventilation systems.The front-facing horizontal, rotatably mounted air deflection slats allow targeted alignment of the airflow. Additionally, the air volume can be individually regulated via an integrated slot damper (adjustable with an Allen key). This enables optimal adaptation of the air distribution to the respective requirements.Thanks to the generous slat geometry, the internal grille allows for uniform air outlet or inlet with low flow resistance. At the same time, it ensures a clean and professional finish of ventilation ducts and pipe penetrations.The various sizes cover a wide range of air volumes and pipe diameters, allowing optimal adaptation to the respective ventilation system.Advantages at a Glance✅ Suitable for supply and exhaust air systems✅ Clean finish of pipe penetrations✅ Low flow resistance✅ Uniform air distribution✅ Rotatable air deflection slats for targeted air guidance✅ Adjustable airflow via integrated slot damper✅ Easy installation✅ Suitable for residential, commercial and industrial applications✅ Various sizes for different air volumesTechnical Details✔ Manufacturer: Intelmann®✔ Product type: Internal grille for supply and exhaust ventilation✔ Application area: Supply and exhaust air systems✔ Installation: Built into ventilation pipes and spiral ducting✔ Design: Internal grille with front frame✔ Air guidance: Front-facing horizontal, rotatably mounted air deflection slats✔ Air volume regulation: Adjustable slot damper✔ Fixing: Visible screw holes✔ Suitable for pipelines and ventilation ductsAvailable Sizes and Air VolumesWidth × Height Suitable Nominal Diameter Max. Airflow358 × 65 mm DN 140 – 400 mm up to 200 m³/h358 × 115 mm DN 300 – 800 mm up to 400 m³/h458 × 65 mm DN 140 – 400 mm up to 250 m³/h458 × 115 mm DN 300 – 800 mm up to 500 m³/h558 × 65 mm DN 140 – 400 mm up to 300 m³/h558 × 115 mm DN 300 – 800 mm up to 600 m³/h658 × 65 mm DN 140 – 400 mm up to 350 m³/h658 × 115 mm DN 300 – 800 mm up to 700 m³/h858 × 65 mm DN 140 – 400 mm up to 500 m³/h858 × 115 mm DN 300 – 800 mm up to 900 m³/hInstallation NoteThe internal grilles are specially designed for installation in spiral ducting. The integrated front frame ensures a clean and professional finish of the pipe opening.Ideally, the internal grille should sit almost flush with the pipe:✔ Installation height 65 mm: optimal at DN 250✔ Installation height 115 mm: optimal at DN 500This results in a particularly harmonious appearance with simultaneously optimal air guidance.Areas of Application✔ Controlled residential ventilation✔ Commercial ventilation systems✔ Industrial and hall ventilation✔ Basement and technical rooms✔ Supply and exhaust air systems✔ Pipe and duct penetrationsTypical Areas of Use– Air outlet for supply air systems– Air intake for exhaust air systems– Wall penetrations of ventilation pipes– Technical and service rooms– Storage and production areas– Residential and commercial buildingsFeatures✔ Low air resistance✔ Uniform air distribution✔ Front-facing horizontal, rotatably mounted air deflection slats✔ Individually adjustable air guidance✔ Adjustable air volume flow via integrated slot damper✔ Low-maintenance design✔ Easy cleaning✔ Visible screw holes for fixing✔ Professional appearanceThe Intelmann® internal grille for supply and exhaust ventilation offers a reliable and visually appealing solution for finishing ventilation ducts. The various sizes allow optimal adaptation to different pipe diameters and air volumes. Thanks to the rotatable air deflection slats and the integrated slot damper, the air guidance can be individually adjusted and the airflow regulated as required.