Louvre Windows
LW-70 — Angled blade line · mesh in the blade channel · 70 mm platform
LW-70
The window that stays open in the rain.
Angled blade line · mesh in the blade channel · 70 mm platform
- 8
- 5
- 35–45 days
- 15 yr
8
5
35–45 days
15 yr
What the section drawing decides
High-end custom is decided in the section drawing, not the brochure. These four layers are held to specification on every LW-70 unit we ship.
01
Blade angle set at the factory
02
Mesh in the blade channel
03
Tempered glass in the fixed panels
04
70 mm thermal-break platform
Technical detail
The section, the hardware and the fixings — photographed, not rendered. This is the level of detail your drawing office specifies against and your site crew installs to, on every unit that leaves the line.
01
Profile cross-section
The 70 mm thermal-break platform carries the blade line — the channel the mesh rides in is part of the section the frame already ships, so the louvre set and the window set it sits beside come off the same line, and the crating is built around the same depth.
70 mm thermal-break platform
Angled, vent position set at the factory
Mesh in the blade channel
Same as the window range
02
Hardware
The blade is a fixed element on this line, so the hardware list is short: the fixing line for the blade, the channel for the mesh, and the gasket line on the glazing column where the fixed panel takes the tempered lite.
Factory-set, sealed into the schedule
Channel-mounted, no face frame
On the glazing column
Function-checked at factory
03
Installation
Factory-assembled and pre-glazed, so the tolerance work is done under a roof. On site the build is a three-zone detail — air, insulation, weatherproofing — and every crate arrives with the install guide and the sealant schedule for that market.
Factory-assembled
3-zone: air / insulation / water
Per-crate install sheet
Scheduled per market
The system in short
Louvre windows keep the opening breathing through the weather: the blade is set at an angle the factory fixes before the unit leaves the bench, the rain runs off the blade face and out of the channel, and the mesh in the blade channel holds the vent against insects without a frame of its own. LW-70 runs the angled blade line on the 70 mm thermal-break platform shared with the window range, for the tropical and high-UV schedules, with the report issued per order and per model.
The blade is the weather line: it is set at an angle the factory fixes before the unit leaves the bench, and the angle is what sheds the rain while the opening keeps breathing. The vent does not close when the sky opens — the water runs off the blade face and out of the channel, and the mesh that sits in the blade channel holds the opening against insects without adding a frame of its own. The fixed panels beside the blade line take tempered glass, and where the schedule states the laminated build the same glazing column carries it.
The platform is the 70 mm thermal-break section shared with the window range, so the louvre set and the window set it sits beside come off the same line and match on the facade. The markets the line is written for are the tropical and high-UV schedules — the South African subtropical coast, the Kenyan highlands, the Nigerian rain — and the report is issued per order and per model, against the configured unit.
Models and sizes
Every LW-70 ships as one of the configurations below — specify by model code in your window schedule and it quotes line by line.
LW-70 FIX
- Fixed blade line at the schedule angle
- Blades only
LW-70 FIX+GLASS
- Fixed blades beside the tempered glass panel
- Tempered single
LW-70 WIDE
- Wide blade bays for the long wall
- Blades only
LW-70 LAM
- The laminated build in the fixed panel
- Laminated lite
Specifications
- 70 mm thermal-break platform, shared with the window range
- Angled aluminium blades, the vent angle set at the factory
- Mesh in the blade channel, no added frame depth
- Fixed blades at the vent position the schedule names
- Tempered single in the fixed panels; the laminated build where the schedule states it
- The frame powder coat or anodise the drawing states
- Report issued per order and per model
Material & craft
The layers held to specification on every LW-70 unit — the section drawing above, written out.
Blade set on the bench
The vent angle is fixed at the factory and sealed into the schedule, so the unit that ships is the unit the report references — the angle that sheds the rain is the argument, and it is made once.
Mesh in the channel
The screen rides between the blades in the blade channel, so the vent holds against insects with no added frame depth and no maintenance line of its own.
The fixed panel beside it
The tempered glass column sits on the same 70 mm platform, so the blade line and the glazing line read as one window on the facade.
What it's worth to you
The open habit with the weather handled: the vent breathes through the wet season instead of closing it out.
One platform for the window and the louvre, so the facade matches and the import carries one schedule.
The report issued per order and per model, against the configured unit: blades, mesh and glazing as the drawing states them.
Specify Louvre Windows
Send the project location, the opening sizes and the finish. Drawings, window schedules or a specification can be attached — quoting is done against the drawings, not a price list.
Where it is specified
The sites we build this system for, and what the schedule changes in each one.
Tropical kitchens and utility rooms
The row that ventilates through the wet season rather than closing it out.
High-UV residential elevations
The open habit with the weather as the constant objection.
Coastal subtropical schedules
The blade line and the finish set against the salt air.
Service and stairwell openings
Constant extraction that the mesh holds against insects.
Imported tropical schedules
One set of platforms for the window and the louvre on the same facade.
Options and finishes
Finish
Anodised Natural
Anodised Silver
Anthracite · RAL 7016
Graphite · RAL 7024
Jet Black · RAL 9005
Traffic White · RAL 9016
Cream · RAL 1015
Champagne · RAL 1019
Ash Natural
Walnut Dark
Bronze
Copper
Design features
Angled blade line, vent position set at the factory
Mesh in the blade channel, no added frame depth
Tempered glass in the fixed panels, laminated variant available
70 mm thermal-break platform shared with the window range
The open position holds through the wet season
Report issued per order and per model
Glass build
Two choices set what the glass does in a LW-70: which coating is on it, and what fills the cavity. The coating sets the solar figure. The gas moves the U-value and leaves the solar figure where it was — which is why the two are decided separately. The values below are published by the glass manufacturers for the build named; they are centre-of-glass figures, and the whole-window value for a configuration is read from the report that covers it.
| Build | SHGC | U, centre of glass | Where it is chosen |
|---|---|---|---|
| LoE-180, argon | 0.69 | 0.26 | High solar gain, cold climate |
| LoE-272, argon | 0.41 | 0.25 | Balanced, the usual default |
| LoE-366, argon | 0.27 | 0.24 | Solar control, west and south glass |
| LoE-366 with LoE-i89 on #4, argon | 0.27 | 0.20 | Solar control with the lowest U-value |
NFRC centre-of-glass values for a 3/4 in two-pane unit with 3 mm lites and a 13 mm argon cavity. The spacer is the third lever and behaves differently again: it works at the edge of the unit, so it shows in the whole-window value rather than here.
Full glass performance tables, including air against argon and EN 673 values →
Buying & delivery
The commercial terms behind the LW-70 — minimum order, quotation, payment, packing and warranty — are the same on every quotation and sit on the commercial terms for a tropical vent order. Buying to resell, or to fabricate the line yourself? how a louvre set is supplied covers the supplier view of the same schedule.
Request a quote for this system- 35–45 days from approved shop drawings. Assembly, glazing and quality control sit inside the quoted lead time, not on top of it.
- Tested to EN 14351-1 and EN 13830. In the South African schedule the assembly answers SANS 613, and the fixed-panel glazing takes the laminated build per SANS 1263-1 where the SANS 10400-N trigger zones apply; the report is issued per order and per model, against the configured unit.Source documents: EN 14351-1·SANS 613·SANS 1263-1·SANS 10400-N
- Hardware and glass schedules ship in the shop drawing package, free, within three working days of approved architectural drawings. Crated corner-protected with desiccant; a loading report per bay and a packing list per crate. Test reports are issued on request.
Documentation
Data sheet
Brochure
CAD sections & BIM families
Specification clauses
RFQ template
Confirm before the order is placed
Six items hold up an order on the LW-70 more often than anything else. None of them is decided here; each one has to be settled on the project side before the drawing set is frozen.
Rough opening, not frame size
Confirm the structural opening and the reveal build-up. The frame is ordered to the approved drawing, and the drawing is what the quotation is built from.
The opening is quoted before the render and the closing detail, then the reveal takes back the clearance.
Glass build
Confirm pane thickness, coating, spacer and cavity gas as one line. The tested configuration is the one the report covers.
Glass specified by thickness alone. The coating, spacer and gas move the U-value and the SHGC independently.
Operation and handing
Confirm the opening direction, the handing and the number of leaves, and say which side the handing is read from.
Handing recorded from the inside on one schedule and the outside on another.
Finish
Confirm the RAL or anodising grade, and whether the address needs a marine-grade schedule.
The finish is picked from a screen, and the coastal requirement is raised after production has started.
Hardware
Confirm handle type, locking point count, and whether the market requires key-operated locking.
Hardware assumed standard; the site then needs keyed-alike cylinders that were never on the order.
Documents with the shipment
Confirm which reports and declarations travel with the crate. A certificate is issued per configuration, not per product family.
Test documentation requested after shipment, when the report for that configuration has to be re-issued.
Screens and insect load
Confirm whether screens are part of the order. In the insect-load markets the screen is what lets the window stay open after dark.
Screens treated as an accessory and quoted separately, then the mesh does not match the frame finish.
Who confirms each part
No single party holds the whole decision. The drawing set is the one place they meet.
Buyer or developer
Opens the order: the standard the project has to meet, and the market it ships to.
Designer or architect
Sets the configuration: sizes, operation, finish and the glass build.
Structural engineer
Where the market requires it, sets the wind load the opening is rated to.
Factory
Confirms what can be built to that drawing, and issues the report for the configuration.
Everything else on the commercial side — minimum order, quotation, payment, packing and warranty — is the same on every order and sits on the commercial terms page.
Compare with the other window systems
Every system in this category on one table — the platform it shares, the opening it carries and the glazing it takes. Figures come from each system record, not retyped here.
| Code | System | Platform | Glazing options |
|---|---|---|---|
| PF-35 | Panoramic Fixed Glazing | Laminated or low-E IGU | |
| TT-75 | Tilt & Turn Windows | 6–24 mm single / IGU | |
| IR-80 | Impact-Rated Windows | Laminated IGU, 0.38 SGP | |
| WA-70 | Wood-Aluminium Windows | 47 dB laminated IGU | |
| CW-60 | Casement Windows | 6–24 mm single or IGU | |
| AC-90 | Acoustic Windows | 47 dB laminated IGU | |
| SM-60 | Smart Motorized Windows | 6–24 mm single or IGU | |
| SW-110 | Six-Track Sliding Windows | 5+12A+5 IGU | |
| AW-55 | Crank Awning Windows | Tempered single pane | |
| BP-60 | Burglar-Proof Windows | Single or IGU, laminated line per SANS 1263-1 | |
| LW-70 | Louvre Windows | Tempered single in the fixed panels |
Louvre Windows installed
Frequently asked
That is the argument for the line — the blade angle is set at the factory so the rain runs off the blade face and out of the channel, and the opening keeps breathing through the wet season rather than closing it out.
Other systems on the same platform
All systems
Specify LW-70 for your project
Request a quote
The Angled blade line configuration is quoted unit by unit, within 24 hours.