DD-T is a double deflection grille, made of galvanized steel, with individually adjustable blades.
The grille is used for introducing or evacuating air and is intended for mounting on a ceiling, wall or rectangular duct.
The grille is equipped with two rows of individually adjustable blades that allow the directing of the air jet.
The front blades are perpendicular to the length.
Grilles with dimensions > 625 mm are built with intermediate crossbar for stiffening. Large products can have multiple crossbars.
The grille is made with mounting holes.
The standard finish is natural galvanized steel.
Dimensional limits: minimum 100 x 50 and maximum 1600 x 1600 mm.
Ak [m²] - The free surface
Veff [m/s] - The effective air speed in the grille
∆Pt [Pa] - Pressure loss
X [m] - The length of the air jet at a speed of 0.25 m/s
NR [dB (A)] - Noise level without room attenuation
The data presented is for 100% open damper
For more sizes see the Technical Data Sheet (bottom of the page).
The grille can be delivered with a connecting plenum to the circular duct, with horizontal or vertical connection.
The plenum is provided with suspension elements (lugs) and bead roll on the spigot, for easy fixing of the flexible duct.
The air flow control can be adjusted by mounting an OBD control damper on the grille connection.
Adapter (plenum box)
The adapter is made of Z140 galvanized steel sheet and is equipped with suspension lugs.
On request, the plenum can be insulated with 6 mm thick elastomeric rubber.
Opposed blade damper OBD
The damper is provided with opposable blades and gears, it is mounted on the grille connection. Depending on the size required, it is made and delivered in one or more pieces.
The mounting/fixing of the grille is done with screws.
Wall/ceiling mounting with screws