Product Highlights

Low profile

  • - to meet architectural requirements of streamlined design and to provide miniinum resistance to wind forces,
  • UV weatherproof - tested and proven in extreme conditions to exclude wind and driving rain
  • Easily installed - ideal for use on existing buildings where spot ventilation is required. 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 - a range of ventilator sizes are available to meet various exhaust requirements
  • Coefficient of discharge - performance tested at a guaranteed minimum of 0.35

Optional accessories
  • Transparent weather hood- 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 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:
  1. 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 Lowline Ventilator exhausts 0.677 m3/sec and a medium Lowline Ventilator exhausts 1.017m3/s.
  6. Divide the total exhaust requirement by these respective rates to determine the number of ventilators required: Small LLV100 = 10.85/0.677 = 16 units or Medium LLV200 = 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

Exhaust ventilators shall be of the Ellflow Lowline 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 0.35.
Each unit shall have an exhaust capacity of ( ) m3/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 1.45 kPa.
Exhaust ventilators shall be constructed of (Zincalume, Galvanised Steel, Colour Steel) Iselect 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].
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