Product Highlights
  • Dual-purpose - ventilator acts as a high-performance
    natural exhaust unit in normal conditions,
    as well as having unrestricted discharge in fire conditions.
  • Release mechanism - designed to automatically release
    and open the ventilator top hood under extreme smoke conditions
  • Low profile - to meet architectural requirements of streamlined
    design and to provide minimum resistance to wind forces
  • Weatherproof - tested and proven to exclude wind and rain in normal operation under extreme conditions
  • Easily installed - rapid fitting into all roofing types with no additional framing or complex finishings necessary
  • Minimum maintenance - protective metal and fittings maximises corrosion resistance.
  • Size variations - a range of ventilator sizes are available to meet various exhaust requirements.
  • Coefficient of discharge - performance tested at a guaranteed minimum of 0.35 in normal exhaust operation and 0.85 in the fully open unrestricted fire position.
Optional Accessories
  • Bird/lnsect screens - to eliminate entry of birds and insects
  • Dampers - manual, electric or pneumatic to regulate air flow
  • Additional bracing - cyclone baffles can be included
Fresh Air Inlet
All natural ventilation systems require an adequate fresh air inlet to function at their rated capacity. Fresh air inlets should be located as close to floor level as possible and have a free inlet area of a minimum of one-and-a-half times the throat area of the Ellflow ventilator. Ellflow manufacture a full range of fresh air inlet louvres for this purpose.
Worked Example
Refer also to the Ellflow Technical Design Guide.
1. Difference between the indoor and outdoor temperature is 10"C.
2. Effective stack height is 10 metres.
3. Required exhaust rate has been determined to be 10.85 m3/s (using either the air change or heat emission method).
4. Multiply the temperature difference by the effective stack height (10"C x 10 metres = 100). Therefore, the exhaust factor is 100.
5. Using the exhaust capacity table, under these conditions at a wind speed of 8km/hr, a small Fireline Ventilator exhausts 0.677m3/s and a medium Fireline Ventilator exhausts l.0l7 m3/s.
6. Divide the total exhaust requirement by these respective rates to determine the number of ventilators required: Small FLVlOO 10.85/0.677 = 16 units Medium FLV200 10.85/1.017 = 11 units
7. A suitable Ellflow fresh air inlet louvre should be selected. To determine the correct size refer to the appropriate Ellflow Louvre Performance Chart and follow the example shown on that sheet.


Recommended Specification
Fire Ventilators shall be of the Ellflow Fireline Model ( ) [specify model number] type and shall be of the size specified on the drawing.
Fire ventilators shall be weatherproof under all normal operating conditions and provide continuous natural ventilation regardless of wind velocity and direction.
Fire Ventilators shall have a minimum coefficient of discharge of 0.35 in normal exhaust operation and 0.85 in fully open fire conditions.
Each unit shall have an exhaust capacity of ( ) m3/s, based on a temperature differential of ( ) "C and an effective stack height of ( )m.
Fire Ventilators shall have a free area of exhaust at least equal to the stack opening and shall be designed to withstand a minimum wind load of i.45kPa. Provision shall be made to enable manual operation from the roof for testing purposes without disturbing the release mechanism.
Fire Ventilators shall be constructed of (Zincalume, Galvanised Steel, Colour Steel) [select one and specify colour where necessary].
Dampers (if required) shall be an integral part of the ventilator and constructed from similar material. Dampers shall be (Manual, Electric, Pneumatic) [select one].

Fireline Ventilator Technical Data