Doors / Bi-fold Doors / Alumina

Alumina Bi-fold Doors by Liniar

A fully aluminium 70mm bi-fold, designed and made by Liniar in Derbyshire. Strong enough for spans up to 8.5 metres, warm enough for U-values as low as 1.2 W/m²K, and finished to match Liniar windows, made to measure by our trade-approved installers.

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Built by Liniar

Liniar designs, makes and tests its window and door systems at its own facility in Denby, Derbyshire, backed by parent company Quanex. Alumina is Liniar’s aluminium bi-fold, designed to sit alongside its uPVC windows in matching colours and styling, then fabricated to measure and fitted by our trade-approved installers.

Why choose Alumina

Taller, wider, stronger

Being fully aluminium, Alumina spans further than uPVC bi-folds: up to 7 panels, 8.5 metres wide overall and 2.5 metres tall.

Warm and comfortable

A polyamide thermal lock stops heat escaping through the lock, and triple glazing brings U-values as low as 1.2 W/m²K.

Highly secure

Multiple bi-directional locking points, shootbolts into the track, anti-lift features and anti-bump cylinders. Secured by Design, PAS 24 and Part Q accredited.

Matches your windows

Sculptured styling and the same colours and woodgrain foils as Liniar’s uPVC windows, so doors and windows look like one set.

Step-free option

A choice of five thresholds, including a Part M compliant low threshold that suits wheelchair users.

Weathertight

Liniar’s patented bubble gasket seals each panel against wind and rain, and the aluminium is fully recyclable at the end of its life.

Configurations

Alumina can be built with up to 7 panels, all folding to one side or split both ways, with French-door and single-door versions for narrower openings. Filter by number of panels to see each layout.

Bi-fold door layout illustration, 7/7/0: 7 panels, all fold to one side — 7/7/07 panels, all fold to one side

Bi-fold door layout illustration, 7/6/1: 7 panels, 6 fold one way, 1 the other — 7/6/17 panels, 6 fold one way, 1 the other

Bi-fold door layout illustration, 7/5/2: 7 panels, 5 fold one way, 2 the other — 7/5/27 panels, 5 fold one way, 2 the other

Bi-fold door layout illustration, 7/4/3: 7 panels, 4 fold one way, 3 the other — 7/4/37 panels, 4 fold one way, 3 the other

Bi-fold door layout illustration, 6/6/0: 6 panels, all fold to one side — 6/6/06 panels, all fold to one side

Bi-fold door layout illustration, 6/5/1: 6 panels, 5 fold one way, 1 the other — 6/5/16 panels, 5 fold one way, 1 the other

Bi-fold door layout illustration, 6/4/2: 6 panels, 4 fold one way, 2 the other — 6/4/26 panels, 4 fold one way, 2 the other

Bi-fold door layout illustration, 6/3/3: 6 panels, 3 fold one way, 3 the other — 6/3/36 panels, 3 fold one way, 3 the other

Bi-fold door layout illustration, 5/5/0: 5 panels, all fold to one side — 5/5/05 panels, all fold to one side

Bi-fold door layout illustration, 5/4/1: 5 panels, 4 fold one way, 1 the other — 5/4/15 panels, 4 fold one way, 1 the other

Bi-fold door layout illustration, 5/3/2: 5 panels, 3 fold one way, 2 the other — 5/3/25 panels, 3 fold one way, 2 the other

Bi-fold door layout illustration, 4/4/0: 4 panels, all fold to one side — 4/4/04 panels, all fold to one side

Bi-fold door layout illustration, 4/3/1: 4 panels, 3 fold one way, 1 the other — 4/3/14 panels, 3 fold one way, 1 the other

Bi-fold door layout illustration, 4/2/2: 4 panels, 2 fold one way, 2 the other — 4/2/24 panels, 2 fold one way, 2 the other

Bi-fold door layout illustration, 3/3/0: 3 panels, all fold to one side — 3/3/03 panels, all fold to one side

Bi-fold door layout illustration, 3/2/1: 3 panels, 2 fold one way, 1 the other — 3/2/13 panels, 2 fold one way, 1 the other

Bi-fold door layout illustration, 2/2/0: 2 panels, all fold to one side — 2/2/02 panels, all fold to one side

Bi-fold door layout illustration, French door 2/1/1: 2 panels, one folds each way — French door 2/1/12 panels, one folds each way

Bi-fold door layout illustration, Single door: 1 panel, opens like a door — Single door1 panel, opens like a door

How to read the code: the first number is the total panels, the second and third are how many fold to each side, so a 7/6/1 is seven panels with six folding one way and one the other. Each panel can be up to 1.2m wide and 2.5m tall.

Technical specification

Figures from Liniar’s own published Alumina specification.

Material	Aluminium, with a polyamide thermal lock
Profile depth	70mm
Styling	Sculptured, to match Liniar windows
Maximum size	Up to 7 panels, 8.5m wide overall (with frame connectors), 2.5m high
Max panel width	1.2m
Max sash weight	90kg
Glazing	28mm double glazing, or 36mm / 40mm triple glazing
U-value	As low as 1.2 W/m²K with triple glazing
Security	Secured by Design, PAS 24 and Part Q accredited; BSI Kitemark
Locking	Multiple bi-directional locking points, shootbolts into the track, anti-lift features, anti-bump cylinders
Thresholds	Choice of 5, including a Part M compliant low threshold
Weather seal	Liniar’s patented bubble gasket
Recyclable	Yes, fully recyclable

Source: Liniar’s Alumina 70mm bi-fold door product page (liniar.co.uk). Maximum sizes depend on the layout chosen, so check your exact opening with us.

Colours & finishes

Colours to match your windows

Alumina comes powder-coated or foiled in flat colours and woodgrains from Liniar’s window range, so your doors and windows can match. Click a colour for a closer look. More colours are available to order.

Flat colour

7016 Grey

RAL 7016

Swatches are a guide only. Ask us for a sample before you choose.

Not sure if Alumina is right for your home?

Get in touch and one of our team will help you choose the right layout, colour and threshold, plus trade pricing if you’re a trade account holder.

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