The Elta APK400/002 ancillary pack is designed to support 400mm ventilation system installations. It includes four anti-vibration mounts to minimise operational noise and movement, two flexible connectors for secure and flexible duct attachment, two matching flanges for a tight and accurate seal, and two mounting feet to ensure stable positioning of the equipment. This all-in-one accessory pack offers reliable performance and simplifies the setup of commercial and industrial HVAC units.