The hollow chamber seal made of EPDM in Smoke Control and Acoustic Access Doors is crucial for ensuring airtight and soundproof properties. EPDM (Ethylene Propylene Diene Monomer) is a high-performance rubber material known for its excellent weather resistance and durability. The seal enhances the functionality of these access doors by providing effective smoke control and sound insulation, making them ideal for applications where air and noise tightness are essential.