Fluid Timeless Window (Crittall)

The Fluid Window is available in both side-hung and top-hung configurations, allowing for flexible ventilation and design possibilities.

Whether used individually or as part of a multi-window arrangement, each format is designed to maintain visual consistency, discreet operation, and seamless integration with surrounding materials.

Technical Specifications

Fluid Timeless Windows combine slim 58mm sightlines, concealed hardware, and custom finishes with modern performance. Thermally broken and PAS24 certified, they offer elegant, secure glazing for heritage and contemporary projects alike.

Window

  • Sightlines : 58 mm

  • Max Glass Thickness : 28mm

  • Max Side Hung Width : 600 mm

  • Max Side Hung Height : 1400 mm

  • Max Top Hung  Width : 1200 mm

  • Max Top Hung Window  : 1400 mm

  • Max Leaf Weight : 40 kg

Door

  • Sightlines : 58 mm

  • Max Glass Thickness : 28mm

  • Max Width : 900 mm

  • Max Height : 2400 mm

  • Max Leaf Weight : 60 kg

Performance

  • Thermal Coefficient Uw : 1.3 W/m² K

  • Sound Insulation : Up to 36 dB

  • Water Tightness : Class 9A

  • Air Tightness : Class 4

  • Wind Resistance : 2400Pa

  • PAS24

Features

  • Concealed hinges and handle

  • Minimal frames and sightlines

  • Crittall alternative

Options

  • 20mm, 25mm or 48mm glazing bars

  • Designer handles

  • RAL colours

  • Anodised finishes 

Standard Handles

A curated range of designer handles allows the Fluid Window to adapt to a variety of interior styles.

Whether the project calls for a subtle, modern finish or a more expressive detail, each handle is designed to complement the window’s clean lines and refined proportions—offering both visual harmony and tactile precision.

  • Colour matched

  • Standard classic RAL

  • Textured RAL (SEN)

White

White

Hardex Graphite

Hardex Graphite

Hardex Chrome

Hardex Chrome

Hardex Bronze

Hardex Bronze

Antique Black

Antique Black

Hardex Satin

Hardex Satin

Black

Black

Colour matched

Colour matched

Knurled Handles

A curated range of designer handles allows the Fluid Window to adapt to a variety of interior styles.

Whether the project calls for a subtle, modern finish or a more expressive detail, each handle is designed to complement the window’s clean lines and refined proportions—offering both visual harmony and tactile precision.

  • Colour matched

  • Standard classic RAL

  • Textured RAL (SEN)

Gun Metal

Gun Metal

PVD Black

PVD Black

Antique Bronze

Antique Bronze

Satin Silver

Satin Silver

Art Deco Handles

A curated range of designer handles allows the Fluid Window to adapt to a variety of interior styles.

Whether the project calls for a subtle, modern finish or a more expressive detail, each handle is designed to complement the window’s clean lines and refined proportions—offering both visual harmony and tactile precision.

  • Colour matched

  • Standard classic RAL

  • Textured RAL (SEN)

  • Antique Brass (extra)

Art Deco

Art Deco

Monkey Tail

Monkey Tail

Bulb End

Bulb End

A refined, minimalist alternative to traditional steel framing

Benefits

Fluid Timeless Windows offer a refined, minimalist alternative to traditional steel framing—combining slim sightlines with contemporary performance. Ideal for conservation areas and heritage buildings, the system balances period charm with modern functionality. Concealed hinges and a clean, flush aesthetic create a sleek architectural profile, while high-quality aluminium ensures long-term durability, ease of maintenance, and visual elegance.

Flexibility for both residential and commercial applications

Architecture

Designed as a modern response to steel-framed fenestration, Fluid Timeless features slim 58mm sightlines and minimal detailing. With multiple sash formats available, the system offers flexibility for both residential and commercial applications. Casement windows—side-hung or top-hung—retain traditional proportions while achieving full compliance with contemporary building standards. 

Modern Versatility with Heritage Proportions
With side-hung windows up to 1400mm, Fluid Timeless suits a wide range of architectural applications. The system’s classic proportions, paired with optional 20mm, 25mm or 48mm glazing bars, make it equally at home in period properties and refined contemporary builds.

Discrete Elegance
Minimal frames and concealed hinges offer a quiet, architectural elegance. Whether framing a garden, courtyard or interior view, the design ensures maximum light with minimal interruption—enhancing flow, depth, and rhythm throughout the space.

Beneath its elegant surface lies robust performance

Technology

The system is fully thermally broken and achieves Uw values as low as 1.3 W/m²K with up to 28mm glass thickness. Sound insulation reaches up to 36 dB, while the system meets Class 9A water tightness, Class 4 air tightness, and 2400Pa wind resistance. Security is assured through PAS24 certification. Options for solar control, privacy, low-iron and acoustic glass are available, along with designer hardware and anodised or RAL finishes—ensuring tailored performance and visual integration.

Reliable Performance, Built In
Fully thermally broken, the system achieves Uw values as low as 1.3 W/m²K and sound insulation up to 36 dB. Designed for resilience, it’s certified to PAS24 and tested to Class 9A water tightness, Class 4 air tightness, and 2400Pa wind resistance.

Lightweight Strength
The slim aluminium profiles are engineered for durability without visual bulk. With glass thicknesses up to 28mm and sash weights of up to 40kg for windows and 60kg for doors, it delivers effortless operation and long-term reliability.

Every element of Fluid Timeless is designed for architectural clarity.

Design

Glazing sits flush within minimalist frames, with options to fully conceal hinges and handles for a clean, unobtrusive finish. Heritage-inspired hardware such as monkey-tail or bulb handles are available for projects that call for historic character, while modern alternatives suit sleek, contemporary interiors. 

Minimalism with Character
Whether chosen for its traditional detailing or contemporary clarity, the system offers a clean, consistent language across windows and doors—making it an ideal solution for projects where understated elegance and technical performance are equally essential.

Tailored Aesthetics
Available in a wide range of RAL colours and anodised finishes, with designer handles and multiple glazing bar options, every element of Fluid Timeless can be customised to reflect the surrounding architecture and client vision.