Ridge ventilators and louvers

Scope of supply

Natural ventilation removes heat, fumes and moisture without running costs. In a pre-engineered building it is usually provided by ridge ventilators on the roof and wall louvers low on the walls, so that warm air rises and exits at the ridge while fresh air enters below. World Steel supplies both as part of the accessories package, with framed openings and trims detailed in the drawings.

• Continuous ridge ventilators in steel, with bird screen and weather baffles.
• Individual gravity ridge ventilators placed at selected bays.
• Turbine (wind-driven) roof ventilators where the market favours them.
• Fixed-blade wall louvers with bird or insect screen and framed opening members.
• Trims, flashings, closures and dampers where specified.

Options and variants

The required free area depends on the heat load, the stack height between inlet and outlet and the air change rate the process needs; a ventilation engineer or the client sets the target and World Steel sizes and positions the units. Mechanical extraction can be combined with natural ventilation.

Materials and finishes

Ventilators and louver blades are typically made from aluminium-zinc coated or pre-painted steel matching the cladding colour, with aluminium or stainless steel used for corrosive atmospheres such as fertiliser stores or coastal plants. Bird screens are galvanized or stainless mesh. The supporting framed openings are part of the secondary framing.

Compliance by market

Ratings and test references

Comfort ventilators and smoke vents are different products: a gravity ridge vent is not a certified smoke vent unless it is tested and designed as one. See ridge ventilators and wall louvers.

Documentation, packing and quotation

Deliverables include ventilator and louver positions on the roof and wall layouts, free-area calculations where requested, framed opening details and product data. Units are packed in crates or boxed kits to protect blades and screens.

A quotation can be prepared quickly when the enquiry states the project location and the code to be used. Please send:

1. Building use, process heat load or required air changes per hour.
2. Preferred product type and finish.
3. Site environment (coastal, chemical, agricultural).
4. Any fire damper or weather rating requirements.

World Steel returns a priced scope with a clear inclusions and exclusions list, the design basis assumed and a typical lead time. Enquiries go through the export supply team in Ho Chi Minh City.