DUCT DIMENSION
(mm)
PRESSURE CLASS (Pa)
Positive or Negative
125
250
500
700
1000
1500
2500
200
0.55
0.55
0.55
0.70
0.70
0.70
0.85
201,250
0.55
0.55
0.70
0.85
1.00
1.31
1.61
251,300
0.55
0.55
0.70
0.85
1.00
1.31
1.61
301,350
0.55
0.70
0.85
1.00
1.31
1.31
351,400
0.55
0.85
1.00
1.31
1.31
1.61
401,450
0.55
0.85
1.00
1.31
1.61
451,500
0.70
1.00
1.31
1.31
501,550
0.85
1.31
1.61
1.61
551,600
0.85
1.31
1.61
1.61

Reinforcement is
Required

601,650
1.00
1.31
651,700
1.31
1.61
701,750
1.31
1.61
751 to 900
1.61
*Sesuai standar SMACNA