Vent Cover Technical Specifications
Available Sizes
For vent covers supplied as one unit.
| Minimum | Maximum* |
|---|---|
| 4” x 1-1/2” | 72” x 18” |
*Length, one piece.
Grilles longer than 72" will be supplied in two or more equal sized units complete with alignment splice plates for attachment.
Vent Cover Face Overall Dimensions
The dimension on the left (duct size) represents the size of the vent cover opening/ductwork.
The size on the right represents the overall size of the frame.
| Duct Size | External Frame Dimension |
|---|---|
| 1 - 1/2” (38) | 2 - 11/16” (68) |
| 2” - (51) | 3 - 3/16” (81) |
| 2 - 1/2” (63) | 3 - 11/16” (94) |
| 3” (76) | 4 - 3/16” (106) |
| 3 - 1/2” (89) | 4 - 11/16” (119)" |
| 4” (102) | 5 - 3/16” (132) |
| 5” (127) | 6 - 3/16” (157) |
| 6” (152) | 7 - 3/16” (183) |
Performance Data
Notes:
Tested in accordance with ASHRAE Standard 70-2006
1. Pressure
All pressures are in inches of water
2. Sound
The NC values are based on a room absorption of 10 dB re 10-12 Watts and a 10 ft. active section. The NC correction values for other lengths are listed in the table below.
NC Correction for Length
| Active Length in Feet | 1 | 2 | 4 | 6 | 8 | 10 | 15 | 20 | 25 | 30 |
| Correction | -10 | -7 | -4 | -2 | -1 | 0 | +2 | +3 | +4 | +5 |
3. Return Air Applications
When used as a return air intake, the NC value given in the performance table will be increased by 4. For return air application, the negative static pressure will be 0.8 times the static pressure value as shown in the performance table.
4. Blanks (—) spaces indicate an NC level below 15.
Available Fastening Types
Countersunk screwholes are visible from the face of the vent cover and are required when mounting for sidewall and ceiling application.
Color matched screws are provided with each order.
Screw Placement
Screws required for different vent cover sizes.
Number of Screws:
Screw Placement:
General Information
Kul grilles are manufactured from aluminum and have a clean, minimalist style. Kul grilles are suitable for all residential floor, wall and ceiling application.
- Extruded aluminum pressed core construction
- Welded / reinforced corners for floor use
- Core bars are supplied parallel to the long dimension
- Core is fixed