Zyle Fenster

EcoTherm SL Casement Door

An aluminium-clad timber casement-door family available in inward- or outward-opening, double- or triple-glazed specifications.

0.91 W/m²KTriple-glazed U-value
1.36 W/m²KDouble-glazed U-value
48 mmTriple glazing
Multi-pointLocking

What this system is designed to do

An aluminium-clad timber casement-door family available in inward- or outward-opening, double- or triple-glazed specifications.

Where we would specify it

It is useful for side, garden and glazed entrance doors where coordinated timber-aluminium construction is needed alongside strong insulation.

Features and performance

  • Aluminium-clad timber construction
  • Double- and triple-glazed versions
  • Inward- or outward-opening
  • Multi-point locking as standard
  • Glazed or panel configurations
  • Dual internal/external finishes

Technical specifications

Scandi U-value1.36 W/m²K
Scandi Plus U-value0.91 W/m²K
Glass units28 mm double or 48 mm triple
OpeningInward or outward

Colours and finishes

Colours and finishes

Powder coated outside, timber within.

The aluminium cladding is polyester powder coated in a wide range of colours, and the engineered timber inside is factory finished with three coats of Teknos microporous paint or stain.

Outside

Material
Aluminium cladding
Finish
Polyester powder coat, in a wide range of colours

Inside

Timber
Engineered redwood as standard; engineered hardwood or European oak
Finish
Three-coat factory spray: water-based Teknos microporous paint or stain

Standard colours 28

Select colours to add them to your project enquiry.

RAL 1035 Pearl beige and RAL 9007 Grey aluminium are effect finishes, made for a powder-coated aluminium face rather than painted timber.

Choose by RAL reference

Browse the RAL Classic range and add the colours you have in mind.

Also available

  • Spacer bars White warm edge spacers as standard; silver or black optional.

Colours on screen are a guide only, and pearl and metallic finishes cannot be shown. Add your choices to your project enquiry and we will go through them with you.

Add to project enquiry

Source: Zyle Fenster’s specification and FAQs for this system. Standard colour range and glazing bead colours: Zyle Fenster, September 2026.

FAQs

Common questions, answered.

The essentials on the EcoTherm SL Casement Door: what it is, how it performs, the options, and where it fits best.

Still have a question?

Our team can talk you through the detail for your project.

What is EcoTherm SL Casement Door?

An aluminium-clad timber casement-door family available in inward- or outward-opening, double- or triple-glazed specifications.

How does EcoTherm SL Casement Door perform?

Published single-door U-values are 1.36 W/m²K for the 28 mm double-glazed Scandi version and 0.91 W/m²K for the 48 mm triple-glazed Scandi Plus.

Which design and specification options are available?

Glazed and panel configurations, inward or outward opening, multi-point locking, RAL aluminium colours and factory-finished timber interiors can be combined.

When would Eco Home Windows specify this system?

It is useful for side, garden and glazed entrance doors where coordinated timber-aluminium construction is needed alongside strong insulation.

Downloads

Drawings and technical data.

3 files for this system, published by Zyle Fenster. Tell us who you are once and everything here opens for the rest of your visit.

Datasheets 2

Specification sheets and technical data

CAD drawings 1

DWG section details for drawing packages

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