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Oblong Slot Holes Perforated Sheets
 
   

 

 
STRAIGHT
  
Oblong Slot Holes Perforated Sheets:


Rectangular Oblong Slot Hole:


Millimetre System:
Holes per Sq. Inch =
645
A x F
% Open Area =
x x y - 0.215 x y2
 x 100
A x F
 
 
SIDE STAGGERED
  
Holes per Sq. Inch =
1290.3
  
A x F
  
% Open Area =
2 x x x y - 0.43y2
 x 100
A x F
 
 
END STAGGERED
 
Holes per Sq. Inch =
1290.3
A x F
% Open Area =
2 x x x y - 0.43y2
 x 100
A x F
 
Note: All above formulas are for Oblong Slot Holes Perforated Sheets.
  For Rectangular Slot Holes Perforated Sheets:


(a) % Open Area (Staggered) =
2 x x x y
 x 100
A x F


(b) % Open Area (Straight) =
x x y
 x 100
A x F
  (c) For Holes (Rectangular) per Sq. Inch., formulas are same as of Oblong Slots shown above for individual  pattern.
 
 
PERFORATION PATTERN
 
   
1) Oblong Slot Parallel to Width
2) Oblong Slot Parallel to Length
3) Oblong Slot End Staggered Parallel to Width		 4) Oblong Slot End Staggered Parallel to Length
5) Oblong Slot Side Staggered Parallel to Width
6) Oblong Slot Side Staggered Parallel to Length

 

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