Vents GR 300x300 gravity grille is used in ventilation systems to block ducts when the fan is turned off. When the fan is turned on, the plastic blades open under the influence of the air flow that passes through the grille. When the fan is turned off, the blades close the section under the influence of gravity. The grille material is white plastic.
Installing the grille
The grille is designed for installation on a horizontal wall surface with sides of the street. The product has a flange that is inserted into a corresponding rectangular hole in the wall or attached to the air duct. All connections must be sealed to avoid air loss.
Dimensions and drawing
| Dimensions | L | H | l | h |
| mm | 303 | 303 | 289 | 289 |
Live cross-sectional area 0.0543 m2
Pressure loss graph
This graph shows the pressure loss at a certain speed of air movement through the grill. For example, at an air speed of 4 m/sec, the pressure loss is 10 Pa. The noise level will be 25 dBA at a distance of 3 meters from the grille. These losses and noise levels are taken into account when choosing the size of the required grating.
