Single
& Double Deflection Adjustable Grilles |
| Throw The selection data is based on grilles located within 200mm of the ceiling. The proximity of the ceiling surface reduces the induction of room air above the grille, so that the air stream clings to the ceiling and increases the throw. Throw should be selected to be 0.75 to 0.9 room width. The throw from grille located clear of the ceiling is reduced to approximately 0.7 of the nomograph value.In this location temperature differences between the supply air and the room air affect the air flow to a greater extent. The drop assessment on the chart for cooled air is applicable in reverse giving the rise for warm air. Increasing the aspect ratio of grille will have little influence on the flow, but will reduce the drop due to temperature differences. |
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Spread 'A' Blades set at maximum divergence (max 45 deg) 'B' Blades set at medium divergence (22.5 deg) 'C' Blades set parallel to air flow (0 deg) Grilles selected for spread at 45 deg deflection, to be effective require to be spaced at a pitch equal to the throw. |
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