Duct-D-Fuser™ Terminal Outlets —
Air Diffuser Grilles, Fittings, Assemblies, and Registers for HVAC Duct Systems

McGill AirFlow manufactures sturdy, low-cost Duct-D-Fuser terminal outlets for exposed HVAC air distribution systems in large, open-area commercial and industrial facilities. Products include a variation of grilles, fittings, assemblies, and registers.

Duct-D-Fuser Installed

The Model DDF-G Series Grilles are constructed to be flush mounted to curved or flat surfaces and designed to provide directional throw airflow performance characteristics similar to tap-mounted grilles.

The Type SP In-Duct Fittings and Assemblies are constructed of 360° perforated duct to provide low-throw, low-draft airflow performance.

Model DDF-R Series Registers are constructed of extruded aluminum and are available in deflection, slot, or drum register designs.

Because of their lighter weight, Duct-D-Fuser products are easier to install and less expensive to manufacture and ship than conventional rectangular tap-type diffusers. If local control of direction, volume, or velocity is required, refer to McGill AirFlow's Factair™ terminal outlet information.

SilverGuard Antimicrobial


McGill AirFlow's Duct-D-Fuser™ Terminal Outlets:

Model DDF-G Series Grilles
Model DDF-G Series Assemblies
Model DDF-G Series Fittings
Type SP In-Duct Fitting
Type SP Assembly
Model DDF-R Series Deflection Registers
Model DDF-RLS Series Linear Slot Registers
Model DDF-RD Series Drum Registers
Performance of DDF Grilles and Registers


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An enterprise of United McGill Corporation—Family owned and operated since 1951

Unless otherwise noted, all (™) trademarks and (®) registered trademarks are property of United McGill Corporation.

Products depicted were current at the time of publication. All product designs, specifications, and features are subject to change without notice.