Direct current 4 inch ducts, this flexible link works seamlessly with air conditioning, dryer occurrences, and other HVAC applications, promoting calm distribution and power reserves This 4 inch channel link lip features precise dimensions with three.9 inch insert diameter, 5.91x5.91 inch wall plate size, and 5.31 inch screw hole spacing, ensuring excellent suitable HVAC arrangements and ventilation setups Developed for easy installation, it includes pre perforated cavities for secure mounting on partitions otherwise ceilings lacking requiring epoxy otherwise sealant, making it ideal for both users and specialists Produced from permanent ABS polystyrene, this lip proposals excellent stiffness and permanent execution, with a temperature resistance extent of 5°C to +60°C for consistent use in various conditions The lip ensures tight associations for round ventilation ducts, minimizing air leakage to maximise ventilation efficiency in heating, refrigerating, and dryer exhaust arrangements