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 Type |
Max Length (mm) |
Max Height (mm) |
Max Area (m2) |
Friction Stays (up to & inc) |
Transom/Mullion Len (mm) inc Frame Max |
Air Permeability Classification |
Watertightness Classification |
Resistance to Wind |
Exposure Cat. as given in Table 1 of BS 6375-1:2009 |
| Projecting Top Hung Int Bead |
1400 |
1400 |
- |
24" |
- |
4 |
7A |
AE2400 |
2000+ |
| Projecting Top Hung Ext Bead |
1400 |
1400 |
- |
24" |
- |
4 |
5A |
AE2400 |
2000+ |
| Projecting Side Hung Int Bead |
600 |
1400 |
- |
16" |
- |
4 |
7A |
AE2400 |
2000+ |
| Projecting Side Hung Ext Bead |
600 |
1400 |
- |
16" |
- |
4 |
5A |
AE2400 |
2000+ |
| Fixed Int Bead |
2100 |
2100 |
4.2 |
- |
- |
4 |
7A |
AE2400 |
2000+ |
| Fixed Ext Bead |
2100 |
2100 |
4.2 |
- |
- |
4 |
5A |
AE2400 |
2000+ |
| Multilights W20035 T/M Int Bead |
2100 |
2100 |
2.5 |
- |
1450 |
4 |
7A |
AE2400 |
2000+ |
| Multilights W20035 T/M Ext Bead |
2100 |
2100 |
2.5 |
- |
1450 |
4 |
5A |
AE2400 |
2000+ |
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 Door |
900 |
2100 |
24-32 |
59 |
| Double Door |
900 |
2100 |
24-32 |
59 |
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 Type |
Air Permeability Classification |
Watertightness Classification |
Resistance to Wind |
| Open In |
4, 600Pa |
3A, 100PA |
3, 1200Pa |
| Open Out |
4, 600Pa |
8A, 450Pa |
3, 1200Pa |
