Vent Cover Technical Specifications

air vent grille face with holes by kul grilles with dimensions information

Available Sizes

For vent covers supplied as one unit.

Minimum Maximum*
4” x 1-1/2” 72” x 18”

*Length, one piece.
Multiple units supplied complete with alignment splice plates.

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

air vent covers performance data by kul grilles

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

air vent covers screw fastening type by kul grilles

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.

air vent grille face with holes by kul grilles 

Screw Placement

Screws required for different vent cover sizes.

Number of Screws:

vent covers number of screws diagram A Z by kul grilles

Screw Placement:

vent covers screw placement diagram A Z by kul grilles

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

Download PDF Version