FRP Industrial Louver

An FRP louver that lets the air through, keeps the rain out, and does not need to be repainted in a chemical atmosphere

Composite louver system for industrial facades, mechanical rooms, and coastal buildings. Drainage-designed blade geometry sheds rain without blow-back; integral color; corrosion-proof in chemical, acid, and salt-spray environments.

Request louver layout quote Download spec sheet (PDF)

Free area (typical)

{{50}}+%

Wind-driven rain test passed

{{2.5}} m/s

Thermal conductivity

0.34 W/mK

Service life

25 yr

What the buyer is trying to solve

Why the page exists.

The buyers who arrive at this page are plant ventilation engineers, mechanical-room designers, and facade specifiers who need a corrosion-proof louver for an industrial building. The existing aluminum louver has pitted at the welds; the existing galvanized steel louver has rusted at the mullion; the existing painted aluminum louver is on its third paint cycle. They want a louver that lets the air through at the published free-area ratio, sheds rain under wind-driven conditions, and survives the atmosphere for 25 years without recoating.

Four use cases where FRP louver is the right answer

Chemical-plant facades

Acid mist plume around the building envelope; aluminum pits, steel rusts.

Coastal / salt-spray buildings

Salt-spray corrosion on aluminum and galvanized; FRP shrugs it off.

Wastewater / desalination

Chlorine contact area; ventilation louver must not corrode.

Mechanical-room intake

Equipment-room ventilation louver; corrosion-proof over equipment life.

Blade families

Choose the blade family by your free-area and rain-shed requirement.

L-D standard drainable

Standard drainable blade, {{3:12}} ratio, integral drainage path. ~ {{50}}% free area.

L-HD heavy drainable

Heavy drainable blade, {{4:12}} ratio, deeper drainage channel. ~ {{45}}% free area; better rain shedding.

L-NS non-sightline

Non-sightline blade for plant office or control-room visibility restriction. ~ {{40}}% free area.

L-AC acoustic

Acoustic-infilled blade for plant noise control. ~ {{30}}% free area; STC {{30–35}}.

L-FS fixed station

Fixed-station louver for ventilation cabinet and equipment-room application. Custom geometry.

Specifications

Blade family	Drainable L-D, L-HD; non-sightline L-NS; acoustic L-AC; fixed station L-FS
Free area	{{30–50}}% depending on blade family
Blade thickness	{{2.5–4.0}} mm depending on blade depth
Mullion	Pultruded FRP channel, {{50 × 25}} mm standard
Frame	Pultruded FRP channel, {{80 × 40}} mm standard
Wind-driven rain test	{{2.5}} m/s wind, no water ingress into the {{2nd}} water penetration class per AMCA 500-L
Standard sizes	Up to {{3}} m wide × {{4}} m tall per panel; multi-panel for larger openings
Mounting	Surface-mount frame; recessed frame on request
Anchor	Stainless A4 self-drilling bolts through frame to existing wall
Insect screen	Optional stainless or aluminum mesh, {{1.5 × 1.5}} mm opening
Bird screen	Optional stainless mesh, {{12.5 × 12.5}} mm opening
Resin system	Vinyl-ester (FR); isophthalic (economy)
UV package	UV-9 inhibitor integral + UV-stable topcoat on visible surfaces
Fire performance	ASTM E84 Class A on request
Volume resistivity	> 10⁸ Ω·cm (non-conductive)
Color	Standard grey RAL {{7035}}; other RALs on request
Design life	{{25}} years in chemical atmosphere

When not to specify FRP louver

Cases where aluminum or steel remains correct.

Three cases where we redirect

Architectural metal finish required. If the owner has specified a polished or anodized aluminum visual in the procurement spec, FRP cannot match it visually. Specify the metal and budget for the paint cycle.
Very large opening (> {{6}} m² single panel). FRP louver panels are stiff enough up to {{3 × 4}} m. Beyond that, structural framing must be re-engineered or a different supplier is needed.
Live fire / smoke exhaust application. FRP is not the standard material for fire-rated smoke exhaust louvers; a fire-rated metal louver with motor is the right product family. We can name suppliers.

Material comparison

Property	Anodized aluminum louver	Galvanized steel louver	Enbuss FRP louver
Mass per m²	~ {{12}} kg/m²	~ {{25}} kg/m²	~ {{6}} kg/m²
Free area	{{45–50}}%	{{45–50}}%	{{40–50}}%
Coating cycle	Anodize {{10–15}} yr	{{24–36}} months	None
Coastal service life	{{10–15}} yr (pitting)	{{5–10}} yr (rust)	{{25}}+ yr
Galvanic with aluminum cladding	No (same material)	Yes - needs isolation	No
Wind-driven rain performance	Standard drainable	Standard drainable	Equivalent
25-yr cost (coastal site)	Some replacement	2 recoat cycles + some replacement	No replacement

Customization & OEM

Building contractors and louver installers typically need a panel sized to the wall opening with the project-specific hole pattern. We supply the louver as a complete panel with frame, mullions, blades, screens, and anchor pattern. First article {{6–8}} weeks; repeat {{3–4}} weeks.

Frequently asked questions

What is the typical lead time for a 50-panel louver order?

From PO to first delivery, typically {{8–10}} weeks for standard L-D louver in grey RAL {{7035}}. Custom blade or color adds {{2}} weeks.

Does the louver pass the AMCAAC 500-L wind-driven rain test?

The drainable blade family passes Class A wind-driven rain at {{2.5}} m/s wind speed per AMCA 500-L. Heavier-rain applications verified on first article. Class C (hurricane-zone) configurations available on request.

Is the louver AMCA-certified?

AMCA ratings published for water penetration, airflow, and pressure drop are project-specific; we can publish ratings for the specific panel geometry on first article.

Can the louver be supplied with a removable insect screen?

Yes. Stainless or aluminum mesh in {{1.5 × 1.5}} mm opening, mounted on a removable frame for cleaning access.

How is the louver installed?

Surface-mount or recessed-mount frame with stainless A4 anchor bolts through the existing wall. Installation per the project drawing; we supply the installation manual with each shipment.

Can the louver be supplied in custom RAL color?

Yes, full RAL range. Standard grey RAL {{7035}} for fast delivery; other RALs add {{2}} weeks.

How is the louver inspected in service?

Visual at annual walk-around; look for surface damage, UV chalking, or impact cracks. Insect screen should be cleaned annually. Inspection interval typically annual.

What documentation comes with each shipment?

Per shipment: dimensional inspection, resin lot certificate, ASTM E84 (if specified), installation drawing, anchor BOM.

Send a wall opening layout

Send the wall opening dimensions, the free-area target, the wind-driven rain class, and the atmospheric exposure. We return a louver panel BOM, a fixed quote, and the AMCA reference data.

Email a louver engineer