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Open are for gratings
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Cross-section through grating
 
 
Sectional view of grating
 
 
 
 
Open area:
 
Note:
The stated values are intended for guidance only and vary with the grating and material dimensions.
 
Standard gratings:
Open area of gratings with horizontal bars:
 

Mesh

2 mm bars

3 mm bars

9 x 30

76%

68%

15 x 15

77%

69%

20 x 20

82%

75%

20 x 30

85%

79%

30 x 30

87%

82%

50 x 50

92%

88%

100 x 100

95%

94%
 
Louvre gratings:
Open area of gratings with 20x2 mm vertical bars and 30x2 mm 45º horizontal bars. The first mesh in is 30 mm.
 

Mesh

Closed front

Open front

20 x 20

56%

 

20 x 30

58%

 

20 x 40

59%

 

20 x 60

60%

 

30 x 30

 

67%

30 x 60

 

69%