Spiral Duct Registers & Direct-to-Duct Diffusers

Direct-to-duct supply grilles and diffusers connect directly to round or spiral ductwork without a plenum box, making them ideal for exposed duct systems and tight installations. Advantage Mechanical Supply carries curved blade and adjustable core styles in galvanized steel and aluminum for residential and commercial HVAC systems. Available in multiple sizes to fit standard round duct diameters.