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Series 25 Casement Aluminium Windows System
Specification
The HWA Series 25 Thermally-Broken Commercial Casement Window has
been designed to offer the specifier the advantages of polyamide thermal
break technology in meeting the latest thermal requirements of the current
building regulations.
Introduction
The basic suite has short, long, equal leg
and unequal leg sections to accommodate
all expected frame options and all
applications. Included in the basic suite of
profiles are drip rails to divert driving rain.
Various other profiles can be designed and
incorporated allowing architects to achieve
flexible designs. The system can be glazed
internally or externally and accommodate
double glazing from 24mm through to
32mm units.
As with all Metal Technology systems, the
Commercial Casement window system is
manufactured to exacting standards
enabl:ng economy to De combined with
strength to give many years of aesthetic,
trouble-free operation.
Thermal Performance
Series 25 System 4-20, in
conjunction with the correct glass
specification is designed to aid compliance
with the latest thermal requirements of the
current building regulations.
Materials
Aluminium profiles are extruded from
aluminium alloy 6060T6, T5 or T4
complying with the recommendations of BS
EN 12020-2: 2001 / BS EN 755-9: 2001.
Polyamide thermal breaks are produced
from glass reinforced nylon sections
designed to withstand temperatures ln
excess of 200°C, allowing the sections to
be powder coated after thermally breaking.
Finishes
The range of sections can be provided in
either of the following range of finishes;
1. Anodised to BS1615 or BS3987
2. Powder organic coated to BS6496
Where a different colour is required
internally and externally, HWA
can accommodate this.
Construction
Frame members are mitre cut at 45°,
corners are reinforced with extruded
aluminium crimping cleats and corner
braces, and a secure joint is formed by
pneumatically crimping into the extruded
crimping cleat. Intermediate mullion and
transom bars are square cut shaped and
fixed securely to the frame by means of
stainless steel screws and fixing cleats, or
screwported joined. All frame joints are
sealed during construction against entry of
water using a suitable 'small gap' sealant.
Extruded weatherstrips and glazing
gaskets are provided to resist the ingress
of water.
Glazing
Glass is set against co-extruded gaskets
which are fitted into gasket grooves in the
frame upstand. Clip in beads are then
fitted to the frame and held secure by
means of colour coded wedges. Standard
moulded setting/location blocks are
provided to Clip into the sections.
Performance
Air permeability - BS 6375: Pt 1: 1983 test
pressure 600 Pa class iv.
Water tightness - BS 6375: Pt 1: 1983 test pressure 600 Pa
Wind resistance - BS 6375: Pt 1: 1983 test pressure 2400 Pa
These levels of performance should be sufficient for any location within the UK. However, should higher levels of performance be required for any reason, HWA advice should be sought.
Security
System 4-20 has passed BS7950: 1997 incorpoating Amendment 1, "Specification for Enhanced Security Performance" as generally accepted on Secure by Design project.
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