# AluK BSF70 Aluminium bi fold doors

> Source: https://arkaywindows.com/aluk-bsf70-aluminium-bi-fold-doors/
> Author: Lukasz
> Published: 2025-12-02T12:13:47+00:00
> Modified: 2026-07-02T14:52:28+00:00

AluK BSF70 HI aluminium bifold doors with slim sightlines, high thermal performance and smooth operation. Manufactured by Arkay Windows for trade projects.

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# AluK BSF70 HI
Aluminium Bi-Fold Doors


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### High-Performance Aluminium Bi-Folding System for Trade Installers


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# BSF70 HI Bi-Fold Door


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### High-Performance Aluminium Bi-Folding System for Trade Installers


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The BSF70 HI maintains a clean aesthetic with slim meeting stiles of 140mm and a unique flush line pop-out handle that allows for square flush stacking panels when doors are fully open, helping create bright, open internal spaces with minimal visual interruption.


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Precision-engineered hardware and strong rollers deliver consistent, smooth operation — ideal for high-traffic residential areas and commercial access points.


[/vc_column_text][vc_column_text css="" text_direction="default"]With **open-in and open-out options**, **panel configurations from 1 to 7 panels**, **PAS24 testing**, and a **low-threshold option**, the BSF70 offers the flexibility needed to suit a wide range of project requirements.

The BSF70 HI accepts **24–40 mm glazing**, enabling a range of double- or triple-glazed units to boost thermal efficiency, security or acoustic performance.[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row type="full_width_content" full_screen_row_position="middle" column_margin="default" column_direction="default" column_direction_tablet="default" column_direction_phone="default" bg_color="#333333" scene_position="center" top_padding="8%" bottom_padding="6%" top_padding_phone="20%" bottom_padding_phone="15%" text_color="light" text_align="left" row_border_radius="none" row_border_radius_applies="bg" overflow="visible" overlay_strength="0.3" gradient_direction="left_to_right" shape_divider_position="bottom" bg_image_animation="none" shape_type="" gradient_type="default"][vc_column column_padding="no-extra-padding" column_padding_tablet="inherit" column_padding_phone="padding-3-percent" column_padding_position="left-right" 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**Specification**
**BSF70 HI Value**





**U-value (double glazing)**
From 1.4 W/m²K



**U-value (triple glazing)**
From 1.1 W/m²K



**Air tightness**
Class 4 (600 Pa)



**Water tightness**
Class 9A (600 Pa)



**Wind load resistance**
Class AE2400 (2400 Pa)



**Security**
PAS 24 certified option available



**Max vent weight**
130 kg



**Max panel width x height **
 1200 x 3000 mm



**Glazing thickness**
28–44 mm





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# FAQ


[/nectar_responsive_text][divider line_type="No Line" custom_height="33px"][toggles style="minimal" accordion="true" accordion_starting_functionality="closed"][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="What makes the BSF70 HI different from the standard BSF70 system?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
The HI (High Insulation) variant features enhanced thermal performance, helping installers meet modern building regulations while maintaining the same slim sightlines and flexible configurations of the standard system.


[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="What glazing thicknesses can the BSF70 HI accommodate?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
The system supports **28–44 mm glazing**, allowing installers to use double or triple glazing depending on the thermal or acoustic requirements of the project.


[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="Is the BSF70 HI suitable for PAS 24 compliance?"][vc_column_text css="" text_direction="default"]
Yes — the BSF70 HI can be specified to **meet PAS 24 security requirements**, making it suitable for new-builds and projects needing compliant entrance solutions.


[/vc_column_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="What are the maximum panel sizes for the BSF70 HI?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
The system handles **panel heights up to 3000 mm** and **vent weights up to 130 kg**, enabling large openings and a wide range of multi-panel configurations.


[/nectar_responsive_text][/toggle][toggle color="Extra-Color-3" heading_tag="h4" heading_tag_functionality="default" title="Can the BSF70 HI be installed with a low or flush threshold?"][nectar_responsive_text inherited_font_style="default" font_size_min="14px" font_size_max="20px" font_size_desktop="1.1vw" font_line_height="1.6" text_direction="default"]
Yes — the system offers **standard (54mm) and low threshold (34mm) option**, giving installers flexibility for accessibility requirements and seamless indoor–outdoor transitions.


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