The Elta APK400SBCYL/002 ancillary pack is a complete accessory solution for 400mm ventilation systems. It includes four anti-vibration mounts to minimise operational noise and movement, two flexible connectors for secure and adaptable duct connections, two matching flanges for proper sealing, and two mounting feet for stable support. This pack ensures quick and effective installation while enhancing system performance and durability in HVAC environments.