Aluminium Doors.

Thermal Performance
Metal Technology's range, in conjunction with the correct glass specification, is designed to aid compliance with the latest thermal requirements of the current building regulations. The polyamide thermal break profiles have been specifically designed to minimise heat transfer across the door profiles.

Thermal performance is further improved through the introduction of specially designed foam profiles. These reduce radiation heat loss across the air cavities within the door profiles to provide additional thermal enhancement.

Aluminium profiles are extruded from aluminium alloy 6060T6, T5 or T4 complying with the recommendations of BS EN 12020-2 / BS EN 755-Parts 1 to 9. Polyamide thermal breaks are produced from glass reinforced nylon sections designed to withstand temperatures in excess of 200‚°C allowing the sections to be powder coated after thermal breaking.

Frame and door sash members are mitre cut at 45 degree. Corners are reinforced with extruded aluminium crimping cleats and corner braces. A secure joint is formed by pneumatically crimping into the extruded crimping cleat. Mullion and transom bars are square cut, shaped and fixed securely to the frame by means of stainless steel screws and fixing cleats. All frame joints are sealed during construction against entry of water using Metal Technology's two part adhesive. Metal Technology recommend that only A2 or A4 austenitic (300 series/class 70) stainless steel fixing screws are used in the assembly of their products.

This system offers internally glazed sashes and can accommodate glazing units from 24mm to 34mm units.


  click here for System 5-20D Hi+ brochure          click here for technical manual



Image Gallery


#1 Customer Service

The underlying objective of Customer care carried out within Alternative Windows will continue to be aimed at maintaining an environment in which everyone employed and associated with the Company perceives themselves as purveyors of quality within Customer relationships.

Contact Us

Sycamore House, Cross Green Industrial Estate Knowsthorpe Lane, Leeds LS90PJ

Driving Directions & Map

Freephone No: 0800 035 4180

Telephone:  0113 2483773
FAX:  0113 2482123