Product HighLights
  • WeatherProof-self-drainlng ventilator
    tested and proven in extreme
    conditions to exclude wind and driving rain from entering the buildlng
  • Low profile- to meet architectural requirements of streamlined design and to provide minimum resistance to wind forces
  • Suctlon diaphragms- ensures effective air exhaust regardless of wind direction
  • Easily installed- Rapid fitting into all roofing types with no additional framing or complex finishings necessary
  • Minimum maintenance- protective metal and fittings maximizes corrosion resistance
  • Slze variations- ventilator throat sizes are available to meet a range of exhaust requirements (l50mm, 225mrn, 300mm, 450mm and �00mm openings)
  • Coefficient of discharge- performance tested at a guaranteed minimum of 0.36
Optional Accessories
  • Transparent Stack Cap- to maximise natural light penetration into the building
  • Bird/ lnsect screens - to eliminate entry of birds and insects
  • Dampers - manual, electric or pneumatic to regulate air flovv 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 20 metres.
3. Required exhaust rate hs been determined to be 61.56 m2/s (using either the air change or heat emission method).
4. Ridge of building is 65 metres long and the entire length is to be ventilated. Therefore the exhaust rate per metre run is 61.56 m2/sec divided by 65m = 0.947 m3/sec per metre run.
5. Multiply the temperature difference by the effective stack height (10�C x 20 metres = 200). Therefore, the exhaust factor is 200
6. Using the exhaust capacity table, a factor of 200 relates to an exhaust rate of 0.947 m3/sec per metre run of the Ellflow 450mm throat Ridgeline Ventilator. Therefore 65 metres of Ellflow Ridgeline Model RLV450 is required.
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 shovvn on that sheet.

Recommended Specification
Exhaust ventilators shall be of the Ellflow Ridgeline Model ( ) [specify model number] type and shall be of the size specified on the drawing.
Exhaust ventilators shall be weatherproof under all normal operating conditions and will perform as specified regardless of wind velocity or direction.
Exhaust ventilators shall have a minimum coefficient of discharge of 0.36. Each unit shall have an exhaust capacity of ( ) m2/s, based on a temperature differential of ( ) �C and an effective stack height of ( )m.
Exhaust 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 2.25 kPa.
Exhaust ventilators shall be constructed of (Zincalume, Galvanised Steel, Colour Steel) [select one and specify colour vvhere 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].
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