Saf-T Vent CI Plus is an AL29-4C superferritic stainless steel conduit with a one-inch air space and a type 430 stainless steel outer jacket.
Ductwork and recommended air velocities
Flow velocity in air ducts should be kept within certain limits to avoid noise and unacceptable friction loss and energy consumption. Low velocity design is very important for the energy efficiency of the air distribution system. Doubling the duct diameter reduces the friction loss by factor 32.
- Common potential risks associated with the TLD procedure include, but are not limited to, worsening of COPD symptoms (shortness of breath, increased cough, COPD exacerbations), coughing up blood tinged mucous, difficulty swallowing, chest pain, upset stomach or feeling of fullness, trouble processing food, and fever.
- Airflow efficiency is the CFM divided by the watts/amount of energy used to run the fan at its highest speed. A CFM of 75 is the minimum number to make a fan efficient. You could have a fan that moves a lot of air (with a high CFM), but does so at a high wattage.
Low and Medium Pressure Loss Ducts
- Maximum friction rate 0.1 - 0.2 inches W.G./100 ft
- Velocity 1500 - 2000 ft/min (8 - 10 m/s)
| Air Flow Rate | Maximum Velocity | ||
|---|---|---|---|
| (m3/h) | (CFM) | (m/s) | (ft/min) |
| < 300 | < 175 | 2.5 | 490 |
| < 1000 | < 590 | 3 | 590 |
| < 2000 | < 1200 | 4 | 785 |
| < 4000 | < 2350 | 5 | 980 |
| < 10000 | < 5900 | 6 | 1180 |
| > 10000 | > 5900 | 7 | 1380 |
High Pressure Loss Ducts
- Maximum friction rate less than 0.4 inches W.G./100 ft
- Velocity 2000 - 3500 ft/min (10 - 18 m/s)
Shafts
| Air Flow Rate | Maximum Velocity | ||
|---|---|---|---|
| (m3/h) | (CFM) | (m/s) | (ft/min) |
| < 5000 | < 2950 | 12 | 2350 |
| < 10000 | < 5900 | 15 | 2950 |
| < 17000 | < 10000 | 17 | 3350 |
| < 25000 | < 14700 | 20 | 3940 |
| < 40000 | < 23500 | 22 | 4300 |
| < 70000 | < 41000 | 25 | 4900 |
| < 100000 | < 59000 | 30 | 5800 |
It is common to keep main duct velocity above 20 m/s (3940 ft/min).
Corridors
| Air Flow Rate | Maximum Velocity | ||
|---|---|---|---|
| (m3/h) | (CFM) | (m/s) | (ft/min) |
| < 5000 | < 2950 | 10 | 2000 |
| < 10000 | < 5900 | 12 | 2350 |
| < 17000 | < 10000 | 15 | 2950 |
| < 25000 | < 14700 | 17 | 3350 |
| < 40000 | < 23500 | 20 | 3940 |
User Areas
- Offices, receptions, lounges and similar
| Air Flow Rate | Maximum Velocity | ||
|---|---|---|---|
| (m3/h) | (CFM) | (m/s) | (ft/min) |
| < 5000 | < 2950 | 10 | 2000 |
| < 10000 | < 5900 | 12 | 2350 |
| < 17000 | < 10000 | 14 | 2750 |
| < 25000 | < 14700 | 16 | 3150 |
Typical Air Velocity Guidelines
Low Velocity Duct Systems
- typical 400 - 2000 ft/min (2 - 10 m/s)
| Applications | Recommended max. Velocity (ft/min) | |||
|---|---|---|---|---|
| Main Ducts | Branch Ducts | |||
| Supply | Return | Supply | Return | |
| Apartments | 1000 | 800 | 600 | 600 |
| Banks | 2000 | 1500 | 1600 | 1200 |
| Hospital rooms | 1500 | 1300 | 1200 | 1000 |
| Apartments, Hotel rooms | 1500 | 1300 | 1200 | 1000 |
| Industrial | 3000 | 1800 | 2200 | 1500 |
| Libraries | 2000 | 1500 | 1600 | 1200 |
| Meeting rooms, cafeterias | 2000 | 1500 | 1600 | 1200 |
| Offices | 2000 | 1500 | 1600 | 1200 |
| Residences | 1000 | 800 | 600 | 600 |
| Restaurants, stores | 2000 | 1500 | 1600 | 1200 |
| Auditoriums, churches, cinemas, theaters | 1300 | 1100 | 1000 | 800 |
Medium Velocity Duct Systems
- typical 2000 - 2500 ft/min (10 - 12.5 m/s)
2.4 Naruto
High Velocity Duct Systems
- typical 2500 - 3000 ft/min (12.5 - 15 m/s)
Related Topics
- Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more
Related Documents
- Air Ducts - Velocity Diagram - Air flow volume, duct size, velocity and dynamic pressure
- Air Flow and Velocity due to Natural Draft - Air flow - volume and velocity - due to stack or flue effect caused by indoor hot and outdoor cold temperature difference
- Duct Velocity - Calculate velocities in circular and rectangular ducts - imperial and SI-units - online calculator
- Ductwork Seal Classes - Ductwork prone to air leakages
- Pressure Classifications of Duct Systems - Duct systems are commonly divided into three pressure classifications
- Speed and Velocity Converter - Convert speed and velocity units - m/s, km/h, knots, mph and ft/s
- Spiral Ducts - Dimensions - Standard dimensions of spiral ducts - Imperial units
- Velocity Classification of Ventilation Ducts - Recommended air velocities in ventilation ducts
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