Backdraft
Technical Information
Calculations
As per regulation, mechanical ventilation requirements for smoke ventilation should be calculated to maintain a minimum of 10 air changes per hour. Due to the variation of extraction capacity, the backdraft ventilator is calculated to maintain 10-15 air changes per hour. The below extraction table is to be used at an average of 25km/h to determine the quantity of ventilators required.
Note: The Backdraft ventilator is not designed for Zone-controlled alarm activation smoke ventilation and only to be used as free-standing ventilators similar to fusible link smoke ventilators.
Features and Specifications
Superiority of the Product
The Tornado features such superior qualities as:
- Special patented fire and heat resistance bearing system
- Durable construction of ventilator
- Manufactured in a choice of Galvanised, Aluminium, Zincalume or Chromadek material
- Various models available: 500mm, 610mm and 715mm
- Adjustable throat section
- *3-year warranty
- Changeable bearing system
- Tested extraction capacity
- Fire rated certification
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| BACKDRAFT TURBINE SPECIFICATIONS | |||||||||
| Specifications | 500mm Backdraft | 610mm Backdraft | 715mm Backdraft | ||||||
| Tested Air removing capacity at | m³/h | CFM | l/s | m³/h | CFM | l/s | m³/h | CFM | l/s |
| - 15km/h windspeed | 4495 | 2646 | 1249 | 6807 | 4006 | 1891 | 9257 | 5448 | 2571 |
| - 25km/h windspeed | 5757 | 3388 | 1599 | 8515 | 5012 | 2365 | 11491 | 6763 | 3192 |
| Sealed bearings | 2 | 2 | 2 | ||||||
| No. of blades | 32 | 40 | 46 | ||||||
| Dome Height | 430mm | 530mm | 630mm | ||||||
| Dome Width | 690mm | 830mm | 920mm | ||||||
| Total Height | 785mm | 925mm | 1015mm | ||||||
| Approximate mass: | |||||||||
| - Galvanised Backdraft | 13.7kg | 19.5kg | N/A | ||||||
| - Zincalume Backdraft | 12.9kg | 18.5kg | 22.3kg | ||||||
| NOTE: The air removing capacity figures shown above have been calculated at an average roof height (heat stack) of five meters above working level. Average windspeed = 15km/h. Higher stack effect = better extraction. |
The below graph illustrates the performance difference of the various size ventilators as per tested extraction capacity reflected in the above table:
