Product information

Alitherm Heritage provides the ideal solution for heritage applications such as listed building renovations and large scale replica-refurbishment projects where planning constraints are to be considered. The window is designed to be built as a series of horizontal modules which can be stacked using horizontal couplers to form a multi-part window featuring a specially design drip bar between modules.

Alitherm Heritage profiles utilise Smart’s innovative polyamide thermal break technology which creates a barrier between the cold air outside and the warm air inside. This technology significantly reduces thermal transmittance and enhances the overall U Value of a product and is designed to meet the exacting requirements of Document L 2010.

Alitherm Heritage products are available in a choice of standard or non-standard colours, including metallic, dual colour, Smart’s Sensations textured, and Alchemy anodised effect finishes.

Please note, Alitherm Heritage has been tested to PAS 24: 2016 for casement windows and fixed lights only.

Alitherm Heritage Window: Design Limitation and Performance

  • Security tested to PAS 24:2016 (casement windows & fixed lights only)
  • Weather tested to BS 6375 Part 1:2009
  • British Standard Kitemark KM 81543
  • British Standard Kitemark KM 81580
  • Fixed windows,tilt turn, side hung or top hung open out casements
  • Polyamide thermal break provides enhanced thermal performance
  • Designed as a direct replacement for steel windows
  • Single or dual colour, marine quality polyester powder coat as standard
  • 316 Marine Grade Stainless Steel Hardware options
  • Heritage and Art Deco hardware options
Window TypeMax Length (mm)Max Height (mm)Max Area (m2)Friction Stays (up to & inc)Transom/Mullion Len (mm) inc Frame MaxAir Permeability ClassificationWatertightness ClassificationResistance to WindExposure Cat. as given in Table 1 of BS 6375-1:2009
Projecting Top Hung Int Bead14001400-24"-47AAE24002000+
Projecting Top Hung Ext Bead14001400-24"-45AAE24002000+
Projecting Side Hung Int Bead6001400-16"-47AAE24002000+
Projecting Side Hung Ext Bead6001400-16"-45AAE24002000+
Fixed Int Bead210021004.2--47AAE24002000+
Fixed Ext Bead210021004.2--45AAE24002000+
Multilights W20035 T/M Int Bead210021002.5-145047AAE24002000+
Multilights W20035 T/M Ext Bead210021002.5-145045AAE24002000+

Alitherm Heritage Door: Design Limitation and Performance

  • Single or double doors
  • Slim sightlines
  • Tape or gasket glazed
  • Multi point locking and face mounted shoot bolts
  • Polyamide thermal break provides enhanced thermal performance
  • Single or dual colour, marine quality polyester powder coat as standard
  • 316 Marine Grade Stainless Steel Hardware options
  • Heritage and Art Deco hardware options

Door Type Max Sash Width (mm)Max Sash Height (mm)Glazing (mm)Typical Sightline (mm)
Single Door900210024-3259
Double Door900210024-3259

Alitherm Heritage Double Door: Design Limitation and Performance

  • Weather tested to BS6375 Part 1
  • Operation & Strength BS6375 Part 2
  • Additional Performance Characteristics BS6375 Part3
  • Security tested PAS24:2016

Door TypeAir Permeability ClassificationWatertightness ClassificationResistance to Wind
Open In4, 600Pa3A, 100PA3, 1200Pa
Open Out4, 600Pa8A, 450Pa3, 1200Pa

MaterialAluminium Polyamide
Dual ColourYes
Thermally BrokenYes
NBS AvailableYes
WER RatingB
U Value1.6W/m²K (using 1.0W/m²K glass unit)
Document L CompliantYes
BS 6375-1:2009Yes
BS 4873Yes
Side Hung Max Width (mm)600
Side Hung Max Height (mm)1400
Top Hung Max Width (mm)1400
Top Hung Max Height (mm)1400
Fixed Max Width (mm)2100
Fixed Max Height (mm)2100
Single Door Max Width (mm)900
Single Door Max Height (mm)2100
Glazing (mm)24, 28, 32 & 36 double or triple glazed units
Frame Depth (mm)47
Typical Sightlines (mm)59