Standards for Duct Manufacturing
SMACNA | IS | |||||||||
Duct Sizes mm | Operation Pressure | Low Pressure | Medium Pressure | |||||||
250 Pascal | 500 Pascal | 1000 Pascal | ||||||||
– | Gauge | Connector Type | Gauge | Connector Type | Gauge | Connector Type | Gauge | Connector Type | Gauge | Connector Type |
0-450 | 26 | C&S/TDF | 26 | TDF | 26 | TDF | 24 | C&S | 22 | TDF |
451-750 | 26 | C&S/TDF | 26 | TDF | 24 | TDF | 24 | C & Standing S/TDF | 20 | TDF |
751-900 | 26 | TDF | 24 | TDF | 22 | Slip on | 22 | C & Standing S/TDF | 20 | TDF |
901-1000 | 26 | TDF | 24 | TDF | 20 | Slip on TTF | 22 | C & Standing S/TDF | 20 | TDF |
1001-1200 | 24 | TDF | 22 | Slip on TTF | 18 | Slip on TTF | 22 | TDF | 20 | TDF |
1201-1300 | 24 | TDF | 20 | Slip on TTF | 18 | Slip on TTF | 22 | TDF | 18 | TDF/Slip on TTF |
1301-1500 | 24 | Slip on TTF | 18 | Slip on TTF | 22 | TDF/Slip on TTF | 18 | TDF/Slip on TTF | ||
1501-1800 | 22 | Slip on TTF | 18 | Slip on TTF | 20 | TDF/Slip on TTF | 18 | TDF/Slip on TTF | ||
1801-2100 | 18 | Slip on TTF | 18 | Slip on TTF | 20 | TDF/Slip on TTF | 18 | TDF/Slip on TTF | ||
2101-2200 | 18 | Slip on TTF | 18 | Slip on TTF | 20 | DF/Slip on TTF | 18 | TDF/Slip on TTF | ||
2201-2400 | 18 | Slip on TTF | 18 | Slip on TTF | 18 | Slip on TTF | 18 | Slip on TTF | ||
2401-2700 | 18 | Slip on TTF | 18 | Slip on TTF | 18 | Slip on TTF |