Castellated Spigots

We supply practical fabrication materials for building custom plenums, ductwork, and HVAC components where standard manufactured fittings or boxes are not suitable.

Our range includes KOOduct duct board sheets, flange systems, and fabrication components commonly used for:

• Small retrofit installations
• Custom on-site plenum construction
• HVAC duct modifications
• Ventilation upgrades
• One-off fabrication work
• Commercial and residential HVAC projects

These products are ideal for installers and contractors needing flexible fabrication solutions for projects where custom sizing, site conditions, or limited space require something outside standard HVAC components.