The Elta APK450SCD/001 ancillary pack is designed to support the installation of 450mm ventilation units by providing all necessary accessories in one package. It includes four anti-vibration mounts to reduce operational noise and vibration, two flexible connectors for secure duct attachment, two matching flanges to ensure a proper seal, and two mounting feet for stable support. This comprehensive kit is ideal for achieving a professional and reliable HVAC system installation in both commercial and industrial settings.