The Spiral Duct Diffuser is used in large areas — factories, warehouses, workshops and gymnasiums — where grilles can be attached directly to the spiral duct which eliminates boots or special adapters for the installation of the grilles.
Available with multiple design options:
150 Single Deflection Supply Grille in (H) horizontal or (V) vertical orientation where each blade is individually adjustable.
250 Double Deflection Supply Grille in (H) horizontal or (V) vertical orientation where each set of blades is individually adjustable.
SSPERF Return Grille is a 51% perforated face return grille.
Specify: Series S-44 Opposed Blade Damper attaches to any of the Spiral Duct Series to make supply registers. The S-44 OBD assures even distribution of air across the grille face as well as positive volume control.