{
  "name": "Mesh louvres & lamella panels",
  "sku": "AVX-1810",
  "brand": "Averinox",
  "summary": "Mesh louvres and lamella panels in aluminium, steel, 304 and 316L. Blade pitch, angle and free area set per opening; bird mesh and frames to drawing.",
  "definition": "A mesh louvre is a bank of angled blades in a frame, faced or backed with woven, welded or expanded mesh, that lets air or gas pass through an opening while rain, sunlight, line of sight, birds and windblown debris do not. Each blade overlaps the one below it: the stream is turned twice around the profiles and carries on, while water runs down the blade face into the frame's drainage channel and out. The mesh — over the blades for one even surface, or behind them as bird mesh — is what also makes the panel a barrier against vermin and hand access. A louvre holds its stated free area and rain rejection only while blade pitch, angle and frame depth stay as they were tested and the velocity stays inside the profile's working band — open it up for more airflow and the protection goes with it.",
  "alsoKnownAs": [
    "weather louvre",
    "louvre panel",
    "lamella grille",
    "ventilation louvre",
    "sand trap louvre",
    "bird mesh louvre"
  ],
  "url": "https://averinox.com/solutions/mesh-louvres/",
  "image": "https://averinox.com/og/solutions-mesh-louvres.png",
  "language": "en",
  "localizedVersions": [
    {
      "language": "en",
      "name": "Mesh louvres & lamella panels",
      "url": "https://averinox.com/solutions/mesh-louvres/"
    },
    {
      "language": "nl",
      "name": "Lamellenroosters & gaaslamellen",
      "url": "https://averinox.com/nl/solutions/mesh-louvres/"
    },
    {
      "language": "de",
      "name": "Wetterschutzgitter & Gitterlamellen",
      "url": "https://averinox.com/de/solutions/mesh-louvres/"
    }
  ],
  "materialNotes": "Extruded aluminium is the standard for building openings — mill finish, anodised, or polyester powder-coated to a RAL colour. Mild steel, hot-dip galvanised and coated, where cost governs and exposure is moderate. Stainless 304 for hygiene areas and 316L where chlorides, washdown chemicals or a coastal position are in play. Duplex and higher alloys are possible for specific duties. Bird mesh, mullions and fixings are supplied in the same material family as the blades unless the specification says otherwise — mixing families is what usually ends a louvre early. Availability and lead time, including for the less common materials and finish systems, are confirmed at quotation.",
  "specifications": [
    {
      "property": "Blade pitch",
      "value": "≈ 50–100 mm centre to centre (standard range); closer on storm and sand profiles"
    },
    {
      "property": "Blade angle",
      "value": "30–45° typical; also 0° drainable and vertical sand-trap profiles"
    },
    {
      "property": "Free area",
      "value": "geometric free area ≈ 30–60 % single bank, ≈ 20–40 % double bank or acoustic; the aerodynamic (effective) free area from an EN 13030 airflow test is lower"
    },
    {
      "property": "Panel size",
      "value": "commonly up to ≈ 2000 × 2000 mm as one panel; some profile systems allow larger — bigger openings are built up as a bank with mullions"
    },
    {
      "property": "Mesh facing / bird mesh",
      "value": "woven, welded or expanded facing over the blades; bird mesh typ. 12–20 mm aperture, insect mesh finer"
    },
    {
      "property": "Frame depth and type",
      "value": "≈ 40–150 mm weather louvre; acoustic ≈ 100–900 mm depending on the attenuation required; channel, flanged or concealed frame"
    },
    {
      "property": "Velocity and pressure drop",
      "value": "≈ 1.5–3.5 m/s through the free area (core velocity); pressure drop is profile-specific and read off the tested curve — in the tens of Pa at intake velocities"
    },
    {
      "property": "Materials",
      "value": "extruded aluminium, mild steel (galvanised), 304/316L; Duplex and higher alloys on request"
    },
    {
      "property": "Finish",
      "value": "mill, anodised, polyester powder-coated to RAL, hot-dip galvanised or a marine coating system"
    }
  ],
  "specificationsNote": "Values shown are standard industry ranges for louvre and lamella panels, not a commitment. Blade pitch, angle, free area, frame type and panel format are confirmed per application after technical review of your opening, air volume and exposure. Free-area, pressure-drop and rain- or sand-defeat figures belong to a specific tested blade profile — no figure on this page is a performance guarantee for a supplied panel.",
  "applications": [
    "Air intake and discharge openings in plant rooms and substations",
    "Rain and sand protection on ventilation and generator intakes",
    "Machine enclosures and acoustic housings around fans and compressors",
    "Bird, vermin and hand-access exclusion in food and pharmaceutical buildings",
    "Screening of rooftop plant, ductwork and transformer compounds",
    "Vane packs for droplet separation in gas ducts and scrubber outlets"
  ],
  "selectionCriteria": [
    {
      "title": "Free area, not the size of the opening",
      "body": "A louvre is quoted as a face size but behaves as its free area. Half the opening or less is what actually passes air, and any mesh behind the blades takes more. Give us the air volume and the pressure you can spend along with the structural opening, and the panel is sized from those. Ask whether you are being quoted the geometric free area or the aerodynamic one: the geometric figure is the minimum area drawn between the blades, the aerodynamic (effective) free area comes out of an EN 13030 airflow test, and the measured figure is always the lower of the two."
    },
    {
      "title": "What the louvre has to stop",
      "body": "Rain, wind-driven sand, sun, line of sight, birds, hands, noise — each pulls the geometry a different way. A single bank at a generous pitch moves air cheaply. A double bank with a hooked profile and a rear gutter defeats driving rain. Vertical blades trap sand. An acoustic blade with an absorbent core cuts noise and a third of your free area with it. Name the one requirement you cannot compromise and the profile follows from that, not from a catalogue page."
    },
    {
      "title": "Frame, fixing and the hole in the wall",
      "body": "Give the structural opening rather than the panel size, and say whether the louvre sits in the reveal, over the face, or in a curtain-wall grid. Channel, flanged and concealed frames mount differently and each consumes a different slice of the opening. Add the frame depth available, the wall build-up, and the wind load if the panel is high or on an exposed elevation. Openings above single-panel size become a bank with mullions — decided at drawing stage, not on the scaffold."
    },
    {
      "title": "Material, finish and what touches what",
      "body": "Choose for the environment: aluminium for weight and coastal façades, galvanised steel where cost governs and exposure is mild, 304 or 316L for hygiene, washdown and chlorides. Then check the assembly. Bird mesh, mullions or fixings in a different metal from the blades can corrode at every contact point — on a wet or salt-laden elevation they usually do. A coating applied before cutting leaves a bare edge exactly where water stands. State the finish system and whether anything is cut or drilled after coating."
    }
  ],
  "faq": [
    {
      "q": "What is the difference between a mesh louvre and a weather louvre?",
      "a": "The two names describe different things about the same panel. \"Weather louvre\" says what it is for: keeping rain out of an opening that still has to breathe. \"Mesh louvre\" says how it is built: the blades are faced or backed with mesh, for a uniform surface, for bird and vermin exclusion, or for both. A panel can be either, or both at once. Say what has to be kept out and the construction follows from it."
    },
    {
      "q": "How large a louvre do I need for a given air volume?",
      "a": "Work back from free area, not from the hole in the wall. Divide the air volume by the velocity you can accept through the free area — around 2 m/s is a common working figure for an intake, higher where noise and water carry-over allow. That gives the free area in m². Divide it by the free-area percentage of the panel and you have the face size. A 50 % panel therefore needs twice the wall opening a naive calculation suggests, and bird mesh takes another slice. Send the volume and the opening you have; if the two do not agree, it is better to know now."
    },
    {
      "q": "Does bird mesh reduce the airflow?",
      "a": "Yes, and by more than most people budget for. A woven or welded bird mesh behind the blades typically removes 10–20 % of the free area you have just paid for — how much exactly follows from the aperture and the wire diameter — and an insect mesh takes considerably more. Put it in the sizing from the start rather than adding it after the panel is made. It also has to be reachable: mesh that cannot be cleaned blinds with leaves and seed and turns a ventilation opening into a pressure drop."
    },
    {
      "q": "Will a louvre keep driving rain out completely?",
      "a": "No profile stops all water at all wind speeds. A louvre is rated by how much it lets through under a defined test, so if your specification calls for a rain-defeat class to EN 13030, or sand penetration to EN 13181, state it with the enquiry. That class belongs to one specific tested blade profile, not to louvres in general, so the profile and its evidence are confirmed at quotation. Where the room behind may see no water at all, a drainable blade with a rear gutter, or a louvre with a drip tray and drain, is the honest answer."
    },
    {
      "q": "Which material should I use on a coastal or chemically loaded site?",
      "a": "Aluminium with a marine-grade coating covers most exposed façades. 316L where chlorides or washdown chemicals are constant, galvanised steel inland or behind a screen. The mistake that ends the panel early is mixing families: a steel bird mesh or steel fixings on an aluminium louvre can corrode the aluminium at every contact point, and on a wet or salt-laden elevation usually do. Blades, frame, mesh and fasteners belong in one material family, and where they cannot be, they have to be isolated."
    },
    {
      "q": "Can you supply one panel for a large opening?",
      "a": "Up to roughly 2000 × 2000 mm a single panel is normal in most profile systems, and some allow more. Above that the opening is built up as a bank with mullions, which also keeps handling and transport to something a crew can manage. Give us the structural opening, the fixing surface and how the panel reaches its position, and the split is set on the drawing rather than on the scaffold."
    },
    {
      "q": "Can louvre blades separate droplets from a gas stream?",
      "a": "Yes — that is a vane pack, the same idea run harder. The gas changes direction twice around deeper, closer blades, the droplets cannot follow the turn, they strike the blade and drain away. Vane packs work at higher velocities than a knitted mesh pad and tolerate solids better, at the cost of a coarser cut. If your duty is process gas rather than a building opening, start from our demister page and send the gas rate, pressure and liquid load."
    },
    {
      "q": "What do you need for a quotation?",
      "a": "The structural opening and whether the panel sits in the reveal or over it, the air volume and the pressure available, what has to be kept out — rain, sand, birds, sight, noise — the fixing arrangement, the material and finish, and the wind load if the panel is high or exposed. A photograph with a tape in the opening covers most of it. Free area, profile and format are then confirmed after technical review, together with availability and lead time."
    }
  ],
  "relatedProducts": [
    "https://averinox.com/products/reactor-internals/",
    "https://averinox.com/products/perforated-media/"
  ],
  "role": [
    "manufacturer",
    "supplier"
  ],
  "manufacturer": {
    "name": "Averinox B.V.",
    "url": "https://averinox.com/",
    "productionModel": "own specification, produced at contracted partner plants"
  },
  "supplier": {
    "name": "Averinox B.V.",
    "url": "https://averinox.com/",
    "email": "mail@averinox.com",
    "address": "Rode Ring 49 M, 1566 HR Assendelft, NL",
    "areaServed": "Europe",
    "foundingDate": "2001-06-01",
    "support": "Business hours Mon–Fri 08:00–18:00 Europe/Amsterdam (CET/CEST); urgent breakdowns by arrangement"
  },
  "rfq": {
    "email": "mail@averinox.com",
    "instructions": "Subject: RFQ Mesh louvres & lamella panels (AVX-1810). Include material, rating/aperture, dimensions, quantity and urgency."
  }
}