The Pioneering Alitherm 400 Window

The Alitherm 400 window is the first thermally broken aluminium system to feature Smart’s pioneering coextruded glazing gasket. This means the beads are supplied with the glazing gasket post-extruded into the profile.

This enables the Quick-Glaze beads to be simply tapped in on site, significantly reducing fabrication and installation time.

Available with a square profile, the slim lines of Alitherm 400 provide excellent weather and thermal performance, as well as the security assurance provided by PAS24 accreditation.

While the flush, flat face option is suitable for off-set, face-mounted espagnolette locks, the square design features a eurogroove, to enable in-line espagnolette locking mechanisms to be used.



Alitherm 400 Windows
Application Domestic / Commercial
Finish  Single / dual colour, marine quality polyester powder coated
Profile Square 
Security  Multi-point locking espag, Inline locking handle as standard
Frame depth  70mm
U Value  1.4 w/m²k 
Air Tested Class 3, 600Pa
Water Tested Class 7a, 300Pa
Wind Tested Class AE, 2400Pa
British Standards KM 81580 /  PAS 24:2012 / KM81543 / BS4873
Add ons 20mm, 42mm
Bead Internal Sash / External Fixed Lights
Cills 85mm, 150mm, 190mm, 225mm, 300mm
Glazing DG 28mm  / TG 32mm
Astragal Bar 25mm / 41mm flat bar
Window Sizes Flush Std Tilt & Turn
SH Max o/a width  865mm 865mm 1200mm
SH Max o/a height 1400mm 1400mm 2100mm
TH Max o/a width  1400mm 1400mm N/A
TH Max o/a height 1500mm 1500mm N/A
Max weight 40kg TH / 40kg SH 40kg TH / 40kg SH 90Kg