Aluminium Windows

Aluminium Slit Windows

Narrow, fixed-glass windows in horizontal or vertical orientation, used for light and clean architectural lines.

Aluminium Windows

AluminiumSlit Windows

Narrow, fixed-glass windows in horizontal or vertical orientation, used for light and clean architectural lines.

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Horizontal or Vertical Orientation

TEXGUARD Coating

Sealed, Non-Operable Glazing

Rubber Gasket Sealing

Why Choose Us

Engineered to a Japanese standard.

Japanese Technology

Every design draws on TOSTEM's Japanese manufacturing standards, refined over decades for precision, fit, and finish.

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Quality Assurance & Testing

Every batch is tested against ASTM, JIS, and AAMA benchmarks for wind, water, and structural performance before it reaches your site.

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Surface & Colour Perfection

TEXGUARD coating locks in colour and lustre for up to 40 years, resisting scratches, fading, and corrosion.

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On-Time Delivery

Pre-engineered, factory-assembled components arrive window-in-a-box, ready for fast, precise on-site installation.

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Flexible Pricing

Multiple series and specifications let you match performance to your budget, without compromising on quality.

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Features & Benefits

What makes it worth choosing.

Narrow proportions in either horizontal or vertical orientation bring in light without opening up the whole wall.

Permanently sealed glass panels give strong protection against wind, dust, and water.

Concealed glazing details keep the exterior look clean and architectural.

Hardware and profiles are engineered specifically for the slit format, not adapted from a standard window.

Typically installs in four to five hours thanks to the window-in-a-box delivery format.

Recyclable aluminium construction supports a lower environmental footprint.

FAQ

Common questions, answered.

What are slit windows typically used for?

They're a popular choice for stairwells, corridors, and feature walls — anywhere a narrow band of light or a clean architectural line matters more than ventilation.

Can slit windows be opened?

No — the glass is fixed to the frame, which is what allows the slim proportions and strong sealing against wind, dust, and water.

What orientations are available?

Both horizontal and vertical slit configurations are available, and can be sized to match a specific architectural feature or repeated in a series along a façade.