What the single deflection grilles (SDG) is.

The series of Single Deflection Grille (SDG) incorporates a single level of individually adjustable blades, Single Deflection grilles are a step up from supply units like air valves. Able to handle much larger air volumes, and with the adjustable blades enabling throw to be directed anywhere in a single plane. When being used for extract this result in the advantages of being able to handle greater air volumes.

Features:

Material: High quality aluminum extruded profile

Construction: Set of individually adjustable blades in a durable construction.

Powder Coating Color: RAL 9010, RAL 9016 or anodized, or as customized.

Cores: Non-removable or Removable Type.

Optional: opposed blades damper.

What the double deflection grilles (DDG) is.

The series of Double Deflection Grille (DDG) with two levels of individually adjustable blades, Series DDG are more suited to supply applications than their Single Deflection (SDG) cousins. Just like SDG grilles though, Double Deflection grilles are suitable for a wide range of settings, including ceilings, walls and on ductwork.

The two rows of blades are set at 90 degrees to each other, with one row set just behind the front most row. Gaps between the blades are sufficient to allow easy adjustment of blades, enabling custom blow patterns to be created. Whether these be targeted towards one area, or fanned out to affect a wide area.

Features:

Material: High quality aluminum extruded profile

Construction: Set of individually adjustable blades in a durable construction.

Powder Coating Color: RAL 9010, RAL 9016 or anodized, or as customized.

Cores: Non-removable or Removable Type.

Optional: opposed blades damper.

Now we can know what the difference between SDG and GGD are and how to select:

The air flow adjustment direction of the type of a single deflection grille is one-dimensional, either horizontal, left or right, or vertical, up and down, but the air flow adjustment direction of the double deflection grille is two-dimensional, with horizontal Left and right and vertical up and down two directions.

single deflection grilles are used for the return air outlet, and the double deflection grille are used for supply air outlet.