Intelmann® Shut-off Damper with Hand Lever Ø 80–355 mm for Ventilation Ducts – Tight Closing, with Motor BracketThe Intelmann® Shut-off Damper with Hand Lever is the reliable solution for manual or motorised regulation of airflows in ventilation and air conditioning systems. It is ideally suited for use in round air ducts and allows precise control of supply and exhaust air in residential, commercial, and industrial applications.The shut-off damper is designed to be tight closing and features a high-quality EPDM lip seal on the damper blade, ensuring high tightness and minimal leakage. This contributes to the energy efficiency of the entire ventilation system and prevents unwanted air losses.Equipped with a hand lever, the air volume can be easily and directly adjusted. Additionally, the damper is fitted with a motor bracket and prepared for use with actuators, especially for Belimo LM and CM actuators. This allows for both manual and automated control without any issues.Advantages at a glance:✅ Tight closing – Minimal leakage thanks to EPDM lip seal✅ Flexible use – Suitable for manual and motorised control✅ Integrated motor bracket – Prepared for actuators (e.g. Belimo LM / CM)✅ Easy operation – Precise adjustment via sturdy hand lever✅ Robust construction – For long-lasting use in ventilation systems✅ Energy efficient – Reduces air losses in the systemTechnical details:✔ Product name: Intelmann® Shut-off Damper with Hand Lever✔ Diameter: Ø 80 – 355 mm✔ Design: Tight closing✔ Seal: EPDM lip seal on damper blade✔ Operation: Hand lever✔ Motor bracket: Suitable for Belimo LM and CM actuators✔ Application area: Ventilation construction, air conditioning, industry & commerceVersions:✔ Standard (AKDL): Shaft length 50 mm from motor bracket✔ Long shaft (AKDLL): Shaft length 120 mm from motor bracket – ideal for actuators with spring return, e.g. suitable for Belimo TF actuatorsApplication & notes:The shut-off damper is used in round ventilation ducts and serves to regulate or shut off the airflow. Thanks to the integrated motor bracket, it can be easily retrofitted with an actuator if required or operated directly in an automated manner.With the Intelmann® Shut-off Damper with Hand Lever, you receive a high-quality, flexible, and tight solution for air volume control in modern ventilation systems.

Product Information „Intelmann® Inspection Piece with Cover / Inspection Flap for Spiral Duct, DN 100–315“The Intelmann® Inspection Piece with Cover provides quick and convenient access to ventilation ducts for inspection, maintenance, and cleaning tasks. The integrated inspection opening facilitates regular checks of ventilation systems and ensures that maintenance work can be carried out without the need for complex dismantling of the ductwork.The component combines an inspection piece with a lockable inspection flap and is directly integrated into the ventilation duct. The all-round seal ensures reliable sealing and supports airtight operation of the system.Due to its precise manufacturing, the Intelmann® Inspection Piece is suitable for spiral ducts with nominal sizes from DN 100 to DN 315 and can be used in both residential ventilation as well as commercial and industrial ventilation systems.Advantages at a Glance✅ Quick access for maintenance and cleaning work✅ Integrated inspection opening with lockable cover✅ Facilitates inspection and upkeep of ventilation systems✅ Robust metal construction✅ Airtight design with seal✅ Easy integration into existing ventilation ducts✅ Suitable for spiral ducts DN 100–315Technical Details✔ Manufacturer: Intelmann®✔ Product type: Inspection piece with cover / inspection flap✔ Design: With inspection opening and seal✔ Material: Steel, galvanisedDimensions✔ Available nominal sizes: DN 100 to DN 315Features✔ Maintenance-friendly design✔ Quick access to the duct system✔ Robust construction✔ Airtight sealing through seal✔ Easy installation in ventilation ductsCompatibility✔ Intelmann® spiral ducts DN 100–315✔ Round ventilation ducts of corresponding nominal size✔ Ventilation and air conditioning systemsApplications✔ Inspection opening for ventilation ducts✔ Cleaning opening for air channels✔ Maintenance access for ventilation systems✔ Control opening for air distribution systemsAreas of Use– Controlled residential ventilation (CRV)– Ventilation systems– Air conditioning systems– Commercial ventilation technology– Industrial plants– Supply and exhaust air systemsWith the Intelmann® Inspection Piece with Cover, you create a permanently accessible maintenance point in your ventilation system. This allows inspections, cleanings, and service work to be carried out quickly and easily without having to dismantle ductwork.

Slide-in backflow flap / internal non-return flap Nominal width 100 mm to 200 mm Opens smoothly, low pressure loss Closes securely, no noise, no rattling The damper is inserted into the ventilation duct For vertical and horizontal installation Housing: Galvanised steel Damper blade: Aluminium Shaft and spring: Stainless steel The non-return damper is used in round ventilation ducts to prevent air backflow. The casing is made of galvanised sheet steel. The damper blades are made of aluminium, the shaft and spring are made of stainless steel. The internal rubber seal reduces noise. The outer foam strip provides a good seal and secures the non-return flap in the pipe. The non-return damper is designed for operation at ambient temperatures up to 60°C, for the transport of clean air, free of coarse dust, grease, chemical vapours and other impurities.

Constant volume flow controller – pressure-independent air volume control for ventilation systemsA constant volume flow controller is used for the automatic and pressure-independent regulation of the air volume flow in ventilation and air conditioning systems. It ensures that the set air flow rate is maintained consistently even with fluctuating pressure conditions in the duct system. This guarantees an even distribution of air throughout the entire ventilation system.The purely mechanical control technology operates autonomously and requires no external power supply. Pressure changes in the air duct are automatically compensated by the integrated control flap continuously adjusting its position. This ensures the desired volume flow remains reliably within the specified control range.Constant volume flow controllers are used in supply and exhaust air systems of residential buildings, office buildings, commercial properties, as well as industrial ventilation systems. They are ideal for stabilising air volumes in individual branches, rooms, or ventilation zones.Thanks to the round design for standard ventilation pipes and spiral duct pipes (Spiro pipes), the controllers can be easily and space-efficiently integrated into existing duct networks.Advantages of the constant volume flow controller✅ Constant air volume flow regardless of pressure fluctuations✅ No external power supply required✅ Purely mechanical, self-regulating operation✅ Easy integration into round ventilation ducts✅ Even air distribution throughout the entire system✅ Low maintenance and durable✅ Suitable for supply and exhaust air systems✅ Quick installation in standard ventilation pipesTypical areas of applicationControlled residential ventilation (CRV)Office and administrative buildingsCommercial and retail spacesIndustrial and production hallsPublic buildingsSchools and kindergartensVentilation systems with fluctuating pressure conditionsVariants and air flow rangesVariant      Nominal diameter     Air flow rangeVSR100      DN100105 – 255 m³/hVSR125      DN125130 – 310 m³/hVSR160      DN160260 – 580 m³/hVSR200      DN200380 – 960 m³/hVSR250      DN250650 – 1430 m³/hHow it worksThe volume flow controller operates with a mechanical control mechanism that regulates the air flow via a movable control flap. When the pressure in the air duct rises, the flap automatically closes further. When the pressure drops, it opens accordingly. This keeps the set volume flow constant within the defined control range.Technical characteristics✔ Design: Round for standard ventilation pipes and spiral duct pipes✔ Control principle: Pressure-independent, mechanically self-regulating✔ Installation: Directly in the air duct✔ Application area: Supply and exhaust air systems✔ Power supply: Not required✔ Maintenance: Low maintenance✔ Use: Ventilation, air conditioning and HVAC systemsA constant volume flow controller is an efficient solution for precise air volume control in modern ventilation systems. It ensures even air supply, improves the system’s control stability, and contributes to economical system operation.