HERTIAGE DOORS
The Alunet Slimline System is a high-performance aluminium bifolding door, combining refined design with exceptional strength and durability. Featuring an ultra-slim 48.5mm frame and a minimal 107mm interlock sightline, it maximises glass, light, and uninterrupted views.
The system supports door heights up to 2600mm (or 3000mm with an upgraded frame), sash widths of 1200mm, and configurations of up to 10 panels, making it suitable for both residential and architectural applications.
Smooth operation, premium hardware, and excellent thermal performance come as standard, exceeding UK Building Regulations with a U-value of 1.4 using high-quality Low-E double glazing.
Astragal bars are fixed to the inside and outside of glazing to create the appearance of multiple panes on a single piece of glass, giving windows a traditional, period-style look (the external bars are fixed by the installer once the frames and glass have been installed).
PAS 24 certified Part L Building Regulation compliance for FENSA certification
10 Year Warranty 7 Point ultra secure locking system (SBD) Reinforced toughened glass as standard
CONFIGURATION
We offer the below options for our Heritage door configurations, opening inwards or outwards (viewed from outside).
Looking for a different configuration? Get in touch and we’ll be happy to help
Style 1: Horizontal Only
2 or 3 horizontal bars
(shown in example photos below).
Style 2: Vertical and Horizontal
1 vertical bar per glass pane
+ 2 or 3 horizontal bars.
2 Panels
3 Panels
4 Panels
5 Panels
6 Panels
Below are our Classic Heritage door configurations, opening inwards or outwards (viewed from outside).
We offer these 3 options in either Steel(dark grey) or Black colour
COLOUR OPTIONS
We offer three standard colours: Anthracite Grey, Black, and White. By holding these in stock, we’re able to deliver faster lead times!
Colour selected will be internal & external colour.
Looking for a different colour? Get in touch and we’ll be happy to help
JET BLACK - RAL 9005
ANTHRACITE GREY - RAL 7016
TRAFFIC WHITE - RAL 9016
CILL OPTIONS
We offer 4 Cill sizes: 90mm, 150mm (Standard), 180mm, 230mm.
All cills are 25mm tall unless you opt for the INTEGRATED CILL.
THRESHOLD OPTIONS
INTEGRATED CILL & THRESHOLD
Integrated cill and threshold profile, total height of just 55mm, delivers a full weather rating while maximising the sash height of the door leaf — resulting in more glass and less frame.
Total height of 55mm (cill included)
STANDARD THRESHOLD
Standard 50mm threshold provides a full weather break, helping keep your property dry and warm in all conditions. It is recommended for external bifolding doors.
Total height of 75mm (cill included)
LOW THRESHOLD
Our 20mm low threshold offers a more seamless appearance, with reduced weather protection. But is ideal for homes with mobility requirements or small children, minimising trip hazards.
Total height 45mm (cill included)
LOW THRESHOLD WITH REBATE
A 20mm rebate can be added to our low threshold, increasing the overall height to just 40mm. The rebate lip provides additional protection against the elements.
Total height to top of rebate 60mm
(cill included).
GLAZING OPTIONS
We offer 3 options for glazing:
Standard Low E 1.2 u-value, Laminated 6.4 1.2 u-value, Triple Glazed 1.0 u-value.
Large glass pane orders will automatically be supplied with toughened glass due to their size.
Standard Low E 1.2 u-value
Laminated 6.4mm
1.2 u-value
Triple Glazed
1.0 u-value
ADDONS + EXTRAS
Frame Extension?
You have the option of adding a 20mm blank frame extension to either the TOP or SIDES of your frame.
Frame Extension Profiles: These are supplementary profiles that increase the overall height of your existing door frame.
Purpose: They are useful for accommodating a larger structural opening, deep plaster, render, or tiles, ensuring a seamless fit.
Installation: The extension is typically attached to the existing door frame, and then the entire assembly is installed into the opening. They are custom-sized to match the original door frame's colour and width.
Trickle Vents?
Trickle vents can be added to either your Door Sash, Frame or Add-on Bar.
Flat Pack?
Frames up to the size of 5m wide will be delivered assembled, but you have the option of having your order shipped to you flat packed, so you can assemble the frame onsite where access is limited!
HERITAGE DOORS QUOTE FORM
Complete the form below to receive an instant quote for your Heritage doors!
If you wish to order multiple door & window units, please complete the section at the bottom of the form.
We’ll then send you an instant quote along with the earliest possible delivery date for your entire order!