Alitherm 400 doors perfectly complement the window range, with the same stylish lines and providing the same ease of fabrication and installation. Available as open-in or open-out, single or double doors, the system provides excellent weather and thermal performance, as well as the security assurance provided by PAS 24:2016 accreditation. Security options include a choice of key wind, lift lever or slam lock multipoint locks. Suitable for both residential and commercial applications, Alitherm 400 can also be combined with Smart’s Designer Door Panels and the company’s range of standard door furniture (including colour matched lever handles, and the Quantum range of stainless steel hardware), to create elegant and contemporary entrance door

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Building Regulations Compliant
Complies fully with changes to Document L of the Building Regulations

Quick-Glaze Bead

Available as Open-in or Open-out, Single or Double Doors

PAS 24:2016 Approved

Enhanced security for aluminium windows and doors

Security Options
A choice of either key wind or lift lever and slam lock or multipoint locks

Smart Designer Door Panels
We offer an extensive range of panels that fit the Alitherm 400 door

Excellent Thermal Performance
An extended polyamide thermal break for enhanced thermal performance


U Value 1.4W/m2 K Single Door
U Value 1.4W/m2 K Double Door
DSER Single Door
B DSER Double Door

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