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The fundamental issue with metal louvers in corrosive environments is that the protective coating is the only thing standing between the structural material and the aggressive atmosphere — and coating failure is a matter of when, not if. Aluminium develops pitting corrosion in chlorinated or acidic atmospheres. Galvanised steel loses its zinc coating progressively in the humid, warm conditions inside cooling tower air inlets. Fibreglass louver blades and frames made from glass reinforced polyester or vinyl ester resin are not affected by these conditions. There's no metal to corrode, no coating to maintain, and no structural degradation over a 25-year service life in even the most aggressive industrial atmospheres.
Fixed Blade FRP Louvers Permanently set blades at a specified angle — typically 45° — providing weather protection and controlled ventilation in a single maintenance-free unit. The standard specification for industrial ventilation louvers in chemical plant buildings, cooling tower air inlets, electrical equipment enclosures, and general industrial building ventilation openings.
Operable FRP Louvers Adjustable blade assemblies with manual crank or motorised actuator for variable ventilation control. Used in HVAC systems, battery room ventilation (where volume flow is critical to gas dilution safety), server room cooling, and any application where airflow needs to be modulated based on temperature, occupancy, or process conditions.
Combination Louver and Bird Screen FRP louver assembly with integrated fibreglass or stainless steel mesh bird and insect screen behind the blade set. Standard for electrical switchgear buildings, generator rooms, and any enclosed equipment space where pest ingress would cause equipment damage or safety hazard.
| Parameter | Specification |
|---|---|
| Frame Material | Pultruded FRP sections — square, rectangular, or channel profile |
| Blade Material | Pultruded FRP |
| Standard Blade Angle | 45°; other angles available to order |
| Blade Depth | 50 mm, 75 mm, 100 mm |
| Typical Free Area | 40–55% depending on blade angle and pitch |
| Maximum Panel Size | Up to 3000 × 2500 mm per panel (multi-panel banks for larger openings) |
| Wind-Driven Rain Resistance | Per BS EN 13030 |
| Resin | Isophthalic polyester standard; vinyl ester for aggressive chemical or offshore applications |
| Colour | Grey standard; custom RAL colours available |
Unaffected by salt spray, H₂S, chlorine, SO₂, and industrial chemical atmospheres — the material that corrodes aluminium and galvanised steel has no effect on FRP.
Colour is integrated in the resin - no coating cycles, no scaffolding to access and repaint louvers at height. Set and forget for 25 years.
Significantly lighter than equivalent steel louver assemblies - reduces structural load on the building opening and simplifies installation.
Manufactured to any building opening dimension - standard sizes don't apply here; every frame is made to the actual opening size.
The most demanding louver environment — warm, saturated air with chlorine and biological treatment chemicals. FRP louvers handle this where metal cannot.
Acid-resistant ventilation panels for buildings housing acid processes, chlorination systems, and solvent handling.
Marine-grade salt spray resistance for ventilation openings in offshore living quarters, control rooms, and utility buildings
Non-conductive ventilation for transformer bays and switchgear buildings where metallic louvers would require careful electrical isolation
25-year life in high-humidity, salt-laden coastal atmospheres where aluminium louvers fail within 5 years.
Tell us about your project requirements, and our team will provide a customized quotation with the best solution for your application..