ALT BF73 Bi-Folding Doors TITEL
Glass Inc

by Glass Inc

26 May, 2024

ALT BF73 Bi-Folding Doors TITEL

The ALT BF73 bi-folding door system is an exclusive, state-of-the-art glazing solution designed for both residential and commercial applications. This system offers a perfect combination of panoramic visibility, maximum comfort, high energy efficiency, and burglar resistance. Whether you’re looking to enhance your home’s terrace exit, create a stunning conservatory, or elevate the aesthetics of a showroom, conference hall, or hotel, the ALT BF73 bi-folding doors provide a modern and versatile solution that seamlessly blends style and functionality. In this article, we’ll delve into the technical specifications, opening configurations, fabrication benefits, and color options of the ALT BF73 system, showcasing why it is the ultimate choice for transforming your living or working space.

Technical Specifications

The ALT BF73 bi-folding door system boasts impressive technical specifications that ensure optimal performance, durability, and energy efficiency. Let’s take a closer look at the key technical aspects of this system:

Maximum Dimensions and Panel Specifications

Maximum Sash Width6500 mm (16800 mm using inline connectors)
Maximum Sash Height3000 mm
Maximum Number of Panels to One Side7
Maximum Panel Width1200 mm
Maximum Panel Height3000 mm
Maximum Panel Weight120 kg
Meeting Stile Width120 mm

The ALT BF73 system allows for expansive bi-folding door configurations, with the ability to accommodate up to 7 panels folding to one side and a maximum sash width of 6500 mm. By using inline connectors, the maximum sash width can be extended to an impressive 16800 mm, offering unparalleled design flexibility for large openings.

Glazing and Thermal Performance

Maximum Glazing Thickness44 mm
Accepts Double and Triple Glazed Units28-44 mm thickness
Thermal Insulation (U-value)1.2 - 1.6 W/(m²K), depending on sash dimensions and glazing

The ALT BF73 system can accommodate double and triple glazed units with thicknesses ranging from 28 to 44 mm, providing excellent thermal insulation. With U-values between 1.2 and 1.6 W/(m²K), depending on the sash dimensions and glazing configuration, this system ensures optimal energy efficiency and comfort in various climatic conditions.

Air, Water, and Acoustic Performance

Air PermeabilityClass 4
Water Tightness600 Pa
Acoustic Performance36 dB

The ALT BF73 bi-folding doors offer exceptional performance in terms of air permeability, water tightness, and acoustic insulation. With a Class 4 rating for air permeability, 600 Pa for water tightness, and an acoustic performance of 36 dB, this system ensures a comfortable and peaceful indoor environment, even in challenging weather conditions or noisy surroundings.

Security Ratings and Profile Dimensions

Burglar ResistancePAS24 certified, ENV 1627 RC2
Frame Depth73 mm
Sash Depth73 mm

Security is a top priority with the ALT BF73 system. These bi-folding doors are certified to PAS24 and ENV 1627 RC2 standards, providing excellent burglar resistance to keep your home or business safe and secure. The system features robust aluminum profiles with a frame and sash depth of 73 mm, ensuring structural stability and durability.

Opening Configurations and Fabrication Benefits

The ALT BF73 bi-folding door system offers a wide range of opening configurations and fabrication benefits, allowing for maximum design flexibility and ease of installation.

Opening Types and Maximum Number of Panels

The ALT BF73 system is available in both outward and inward opening configurations, accommodating various architectural requirements and personal preferences. The system allows for a maximum of 14 panels in total, with up to 7 panels folding in each direction. However, based on user operation, it is recommended to limit the number of panels to a maximum of 7 to one side for optimal functionality and ease of use. Additionally, the ALT BF73 system offers the option to use one door as the main leaf, allowing for convenient access without involving the other bi-folding panels.

Fabrication Benefits

The ALT BF73 system is designed with fabricators and installers in mind, offering numerous benefits that streamline the manufacturing and installation process:

ReliabilityPremium quality aluminum profiles and accessories ensure durable and comfortable system operation
Burglar ResistanceEquipped with burglar-resistant elements and hardware, certified to PAS24 (class D)
Design FlexibilityDifferent opening types and configurations for various applications
Adjustable ProfilesAllows for on-site adjustments to compensate for manufacturing errors
Ease of AssemblyUse of fixing elements, connectors, and plugs reduces time and simplifies the assembly process

The system’s adjustable profiles allow for on-site adjustments, compensating for any manufacturing errors and ensuring a perfect fit. The use of fixing elements, connectors, and plugs streamlines the assembly process, reducing installation time and complexity.

Color Options and Customization

The ALT BF73 bi-folding door system offers a wide range of color options and customization possibilities, allowing you to create a unique and personalized look that complements your architectural style and interior design.

Powder Coating

RAL ColorsAny RAL color (Qualicoat certified)
Exclusive CollectionsFutura, Precis, Anodic
Surface TypesGlossy, matte, textured
Innovative CoatingAntimicrobial BIO-coating option

The ALT BF73 system can be powder coated in any RAL color, with Qualicoat certification ensuring a high-quality, durable finish. ALUTECH also offers exclusive color collections, such as Futura, Precis, and Anodic, providing a range of trendy and sophisticated options. Various surface types, including glossy, matte, and textured finishes, allow for further customization. Additionally, the innovative antimicrobial BIO-coating option provides an extra layer of protection, ensuring a hygienic and easy-to-clean surface.


StandardConformance to Qualanod standard
Colors9 standard colors
Surface TreatmentsChemical etching, bead blasting, brushing

For a more natural and luxurious look, the ALT BF73 system can be anodized in accordance with the Qualanod standard. ALUTECH offers 9 standard anodized colors, with the option for different surface treatments such as chemical etching, bead blasting, and brushing, creating unique textures and visual effects.

Wood-grain Effect

StandardConformance to Qualicoat standard
Options5 woodgrain options

To achieve a warm and natural appearance without the maintenance requirements of real wood, the ALT BF73 system offers wood-grain effect finishes. Conforming to the Qualicoat standard, these finishes are available in 5 different wood-grain options, allowing you to create a stunning and inviting atmosphere in your living or working space.

Professional Consultation and Installation

At Glass Inc., we are proud to offer the ALT BF73 bi-folding door system as part of our comprehensive range of high-quality glazing solutions. Our team of experts is dedicated to providing professional consultation and installation services, ensuring that your project is executed flawlessly from start to finish.

Our services include:

  • In-depth consultation to understand your specific requirements and preferences
  • Detailed project planning and design assistance
  • Precise measurements and custom fabrication
  • Expert installation by our skilled and experienced technicians
  • Post-installation support and maintenance services

We work closely with you throughout the entire process, providing guidance and support to help you make informed decisions and achieve the best possible results. Our commitment to quality, professionalism, and customer satisfaction ensures that your ALT BF73 bi-folding door system will exceed your expectations and transform your space in ways you never thought possible.


The ALT BF73 bi-folding door system is a cutting-edge glazing solution that combines modern aesthetics, exceptional performance, and versatile functionality. With its impressive technical specifications, diverse opening configurations, and extensive customization options, this system is the perfect choice for homeowners and businesses in Atlanta, GA, looking to enhance their living or working spaces.

At Glass Inc., we are committed to providing the highest quality products and services to our clients. Our team of experts is ready to guide you through the process of selecting, customizing, and installing the ALT BF73 bi-folding door system, ensuring a seamless and stress-free experience from concept to completion.

To learn more about the various aspects of bi-folding doors, from their benefits and energy efficiency to outdoor applications and smart technology integration, explore our comprehensive set of sub-topic pages. Contact Glass Inc. today to schedule a consultation and discover how the ALT BF73 bi-folding door system can revolutionize your space and elevate your lifestyle.

Got a question? Contact us.