Pre Fab Duct
- Galvanized Steel: Commonly used for ductwork due to its rust-resistant zinc coating.
- Insulation: Ducts are insulated with fiberglass blankets or double-walled with inner liners.
- Custom Sizes: Rectangular ducts are often custom-made, with sizes ranging from 4" to 24".
- Pipe Lengths: Standard duct pipes come in 5' or 10' lengths for easier handling.
- Faster Installation: Pre-fabricated ducts are manufactured off-site, reducing on-site labor and installation time significantly.
Selection of Flange Class & Duct Gauges
| Dimension (in mm) | Duct Pressure in inches / (Pascals) | |||||
|---|---|---|---|---|---|---|
| 1″ (250) | 2″ (500) | 3″ (750) | 4″ (1000) | 6″ (1500) | 10″ (2500) | |
| 150-250 *1 | 26 G | 26 G | 26 G | 26 G | 26 G | 24 G |
| 251-300 | 26 G | 26 G | 26 G | 26 G | 24 G | 24 G |
| 301-350 | 26 G | 26 G | 26 G | 26 G | 24 G | 22 G |
| 351-400 | 26 G | 26 G | 26 G | 26 G | 24 G | 22 G |
| 401-450 | 26 G | 26 G | 26 G | 26 G | 24 G | 20 G |
| 451-500 | 26 G | 26 G | 24 G | 24 G | 24 G | 20 G |
| 501-550 | 26 G | 26 G | 24 G | 24 G | 24 G | 20 G |
| 551-600 | 26 G | 26 G | 24 G | 24 G | 24 G | 20 G |
| 601-650 | 26 G | 26 G | 24 G | 24 G | 24 G | 20 G |
| 651-700 | 26 G | 26 G | 24 G | 24 G | 22 G | 18 G |
| 701-750 *2 | 26 G | 26 G | 24 G | 24 G | 22 G | 18 G |
| 751-900 | 26 G | 24 G | 22 G | 22 G | 20 G | 18 G |
| 901-1000 | 26 G | 24 G | 22 G | 20 G | 18 G | 16 G |
| 1001-1200 | 24 G | 22 G | 20 G | 18 G | 18 G | |
| 1201-1300 | 24 G | 20 G | 18 G | 18 G | 16 G | |
| 1301-1500 | 24 G | 18 G | 18 G | 16 G | ||
| 1501-1800 | 22 G | 18 G | 16 G | |||
| 1801-2100 | 20 G | 18 G | ||||
| 2101-2400 | 18 G | 18 G | ||||
| 2401-2700 | 18 G | |||||
SMACNA – Sheet Metal and Air conditioning Contractor’s National Association Inc – “HVAC Duct Construction Standards- Metal & Flexible” -1995, U. S.A.
READING GUIDE – For Duct sizes between, say, 701 mm and 750 mm, when the pressure class is 1″ w. g. static, we require TDC Flange and duct gauge of 26. For the same range but with static pressure at 4″ w. g. TDC Flange with duct gauge of 24 should be used.
Related Products
Pre-Fab Duct
Galvanized mild steel ductwork resists rust, is insulated with fiberglass, and comes in various sizes.
VOX
Infratop PVC ceilings are durable, easy to install, and maintenance-free, ideal for roofs, carports, gazebos, and terraces.
HVAC Products
Ideal for all sectors, evaporative coolers are energy-efficient, eco-friendly, and great for large residential use.
PVC Panels
PVC ceiling panels are lightweight, waterproof, and a versatile alternative to traditional mineral fiber ceilings.
SuperHD Board
Rapicon wall panels offer superior insulation and quick installation with a tongue-and-groove design.
Building Products
Vnext products deliver exceptional quality, style, and durability for lasting interiors and exteriors.