Radial Opposed Blade Damper Series: 900D Aluminum neck-mounted damper for the 900 series round ceiling diffusers, designed to give jam free operation. Units shall include a removable damper operator knob constructed of high-impact nylon, and shall prevent tapering after the outlet is balanced. Supplied with mounting hardware.	Butterfly Damper Series: BDS Steel, round damper with butterfly-style blades, adjustable at the face of the diffuser.
Opposed Blade Damper for Grilles - Steel Series: OBD Steel opposed blade volume damper. Screwdriver slot operable at the face of the grille or diffuser. The stainless steel OBDSS is also available as stand-alone or an option to stainless steel grilles and diffusers.	Opposed Blade Damper for Grilles - Aluminum Series: OBDA Steel opposed blade volume damper. Screwdriver slot operable at the face of the grille or diffuser.
Radial Shutter Damper Series: RSD Galvanized steel economical radial shutter damper for use in round ceiling diffusers. Designed to permit precise damper control that does not interfere with diffuser air patterns.	Square to Round Transition Series: TR Aluminum square-to-round transition permits installation onto round or flex duct applications. Available as an accessory to most USAIRE products with square necks.
Deep Square to Round Transition Series: TRD Aluminum square-to-round transition permits installation onto round or flex duct applications. Higher depth than standard TR to permit use on products with a built-in damper. Available as an accessory to most products with square necks.	T-Bar Plaster Frame Series: TBPF Aluminum T-Bar Plaster Frame designed for the installation of a ceiling diffuser into a plaster or gypsum type ceiling system.
Steel T-Bar Plaster Frame Series: STBPF Steel T-Bar Plaster Frame designed for the installation of a ceiling diffuser into a plaster or gypsum type ceiling system.