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We are the official Windmaster International ® agent for sales and distribution of their product range for the Eastern Cape. We also supply a range of air ventilation products to assist clients with most specific ventilation problems..


Submit your questions for comment on any of the products mentioned. 

Smoke Ventilation and Air Ventilation,

   the difference :

There is confusion in the building industry as to the correct compliance for Fire Service approval.

 An opening in the roof at 3% of the total floor area for a "ventilator" does not constitute a smoke protection system.

A smoke ventilator system must be designed specifically for a building to enable heat and smoke to be expelled from the building under fire conditions.

A separate air ventilator system is designed for the building and occupational use thereof to operate on a continuous basis under normal conditions to refresh the air in the building.

In simple terms, a building should have two ventilation systems.

This is now changed with the introduction of the BACKDRAFT fire and smoke turbine ventilator range from Windmaster. Your building can be ventilated 24/7 and ready if that fire ever does start.

General Discussion Topic

Condensation : on the underside of metal roofs is a natural phenomonom generally occurring when humidity is high and a large temperature difference occurs between the inside and outside of a roof.

The only way to reduce this is to ensure a good air flow under the roof sheets by ventilating the roof space (between the roof and the ceiling).Air inflow is normally by the use of "air bricks" but fans can also be used at a level immediately above the ceiling or installed into the ceiling. Air outflow is normally at the highest point(s) in the roof, to where the hot air rises and ventilators are the normal products used for this air extraction.

This is a very basic assessment and different roof layouts and conditions will require different solutions to the problem.

Forward your questions or detailed requirements to terry@terrywaite.co.za or contact Terry directly on 082 852 1691 to discuss your needs.



The products available from Terry Waite Agencies include for conventional Static ventilators and Active ventilators, as well as a range of Smoke ventilators and louvers.

There are a variety of manufacturers, some of which have their own specific designs and manufacturing tooling, others being standard designs.


These are the conventional vents of a boxed construction over a hole in the ridge or on the slope of the roof where hot air rises to and escapes under normal convection. The extraction is activated by the outside wind movement and the volume extraction will be dependant on the wind velocity. Extraction calculations are done based on 1% to 3% of the floor area of a building to the ventilator openings.

Please do not confuse this calculation with that of Smoke ventilation which is specifically done for the specific requirements of a building.

Manufacturer brands that are available through Terry Waite Agencies include products from   Curvent,  Flashex,  Helm Engineering,  RVI (Robertsons Ventilation Industries) and  Ventrite

Please contact sales@terrywaite.co.za for more information and quotations.


These are vents which utilise the rising hot air to move a turbine cowl which then creates a vacuum, drawing out more hot air so as to attain a balance with the ambient air and consequently being more effective than conventional vents. They are not dependant on the outside wind movement but it will increase the turbine speed and extraction capability.

There are a variety of products in the market but only a few have been tested and the known extraction capability of a unit published for correct calculation of requirements.

The Windmaster International® range of Tornado turbine ventilators has been successful in the market for years and is Proudly South African.
The new BACKDRAFT fire  and smoke ventilator is also now available and is based on the tried and tested Tornado range of vents. Production is on request at present, so contact us for further advice.

We are also able to supply products from Curvent International (Pty) Ltd (Pinnacle turbine) and Turbovent Africa (Pty) Ltd (Supa-vent, Whirlybird, Twister and Hurricane)

Please contact sales@terrywaite.co.za for more information and quotations.


These are designed to allow a flow of air into, through or out of a building and can be manufactured in various sizes and designs for fixed or adjustable operation. They are generally used in conjunction with other ventilation product for maximum efficiency. These products must not be confused with the smoke louvers mentioned below, which will operate on a different system for a different application.

For more information please contact sales@terrywaite.co.za  


The Windmaster Powa-Breeze® range is available in 1250mm, 950mm and 600mm diameter sizes utilising either single phase 220v power or three phase 380v power. They can be used for forced extraction or for the input of air with volumes of 43000m³/h, 32000m³/h and 20000m³/h respectively.

For more information please contact terry@terrywaite.co.za for quotations.


This range of products are not recommended for coastal areas where natural humidity is generally high and therefore reduces the effectiveness of the units. For drier inland climate areas they are designed and manufactured to effectively cool most commercial and industrial buildings.

The Windmaster® Aqua-Breeze® VR165 model is available and a system should be designed to your specific building and requirements, so please submit your enquiry with as much information as possible.

For more information please contact terry@terrywaite.co.za


These are designed to open during a fire, utilising a Fusible Link, Electromechanical or Pneumatic system, releasing the heat together with the smoke from the fire thus allowing better visibility at ground level and access for the fire services.

There are specific calculations required for a specific building occupancy and design and no one application is the same.

Windmaster International (Pty) Ltd has recently launched the new
BACKDRAFT fire and smoke ventilator.
This is the first active smoke ventilator on the market and is based on the tried and tested Tornado range of active ventilators. Fire rated test and certification is available on request for those institutions that require the information. This will be a huge cost saver.

For more information contact 
terry@terrywaite.co.za or give us a call

Manufacturer brands that are available through Terry Waite Agencies include products from   Curvent,  Helm Engineering,  RVI (Robertsons Ventilation Industries) and  Ventrite

For more information contact terry@terrywaite.co.za 


This exclusive Windmaster® product is based on the turbine ventilator but with an improved bearing system to accommodate the high heat conditions of fire places. This improved system has been tested to withstand a heat of up to 300°C.  It is available in a 300mm and 350mm diameter size in galvanised Chromadek steel material with a "Charcoal" grey colour finish as well as unpainted Stainless Steel material. It is supplied with a square baseplate of approximately 100mm larger than the unit diameter, to facilitate fixing to the top of a brick built flue. Generally the 300mm unit is used for fire areas of 1m wide or less and the 350mm unit on larger fire areas. The flue height, size, design and air flow will have an influence on the size of the unit used. Fixing to other flue types is possible but for the owners requirement and cost.

The 500mm
Chimney Champ is now also available in the Chromadek Charcoal grey colour material (not Stainless steel) for those huge braais and is produced on special request only.

For more information please contact Terry 

Discussion Board : The design and construction of your braai or fire place with the chimney flue will determine whether you get smoke drawn back down into the fire area and then into the room or braai area,  or not.  Two main design and build problems keep presenting themselves and these problems should be resolved before any extraction system can be installed.

Is there a "fire wall" between the smoke chamber above the fire area and the opening of the flue ?  - If not, then make one from steel plate. It should be the width of the flue opening and formed to an "L" shape at about 120° angle, the short side being fixed to the rear wall of the chimney at the flue opening and the long side extending about 2/3 of the flue depth (front to back) up into the flue. This creates a reduced opening 1/3 of the flue, to force hot air and smoke to rise into the flue as well as a ledge / wall to prevent cold air and smoke dropping back into the fire area and consequently the room. This is similar to the corbling of bricks or a "damper" which used to be fitted to the older steel braais to assist in controlling the air flow.

Does smoke spill out of the front of the braai / fire place ?  - This usually occurs for two reasons. Firstly the opening of the fire area is to high in relation to the fire area itself. Secondly, the front lintol of a brick built fire place has been installed in a horizontal position rather than sloping or stepped back into the fire area (smoke chamber), towards the flue. This problem can only be correctly evaluated once the "fire wall" problem above has been resolved. If smoke still spills out, a panel needs to be installed in the top front of the opening, to a depth which prevents the spillage and actually reduces the height of the opening. This can be made of non-combustible material to suit the fire place and will be a permanent fixture.

Other problems with design, build and use that we have encountered over the years ;-

Smoke that spills out of the braai / fire place in puffs - is generally encountered with indoor braais and fire places where air inflow is reduces to an extent that more air is drawn up the flue than can be replaced in the room by natural means. This causes the room to have a negative pressure or vacuum and the only way the inside air pressure can balance with the outside air pressure, is to draw air down the flue. No accessory on the top of a flue will solve this problem. Opening a door or window in the room will allow air in, balance the air pressure and create an air flow.
A similar problem can occur with "down drafts" from outside wind movement and cause the puffs of smoke or longer periods of smoke but not continuous spillage of smoke as mentioned above. The Chimney Champ will help resolve the problem of "down drafts".

Another problem that causes excessive smoke is a flue that is not insulated, especially when it extends outside of the roof area, and if it is a single pipe or single skin brick flue.  This causes extreme cooling of the air in the flue which drops back down before it can be expelled. The Chimney Champ will assist with expulsion but may not perform correctly if the flue is high. The only remedy is to insulate the flue, at least the length that protrudes above the roof.

Please remember that any fire place needs air flow to operate properly, so ensure a window or door is left open to allow air into the room which will be drawn to the fire place and up the chimney flue and with outdoor open fire places ensure that trees / vegetation and other buildings do not interfere with the air flow up and out the chimney flue.

Confused ?
  - Re-read the above, check your fire place and should you remain confused, then give us a call ... 082 852 1691

We can also supply a 220v electrically operated  Chimney Extraction Fan  which is designed to withstand high temperatures (±200°C) for long periods and installed on the top of the flue for situations which require mechanical ventilation of a fireplace.

 or contact terry@terrywaite.co.za for quotations.


This product is manufactured from a black ABS acrylic (plastic) material or UV stabalised Poylpropylene, so it will not rust. The vertical vanes were designed specifically for the ventilation of sanitation vent pipes of the standard 110mm and 160mm diameter as well as up to 240mm diameter pipes., where the ingress of rain and moisture is not problematic. It assists in the expulsion of harsh odours and vapours.

Discussion board : - installation is with four self tapping screws, preferably stainless steel.

For more information please contact sales@terrywaite.co.za

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