OS2 75 - Steel&Brass windows

strong profiles to choose from to find solutions for all project requirements
Thermal insulation Uf

> 1,04 W/(m2K)

Air tightness window

class 4



Wind tightness

class C5

OS2 75 is part of the group of OS2 systems studied, conceived and realized by Secco Sistemi to replace the doors and windows used from the nineteenth century up to the middle of the last century. This thermal break steel window comes in an array of more than 40 profiles, with visible sections reduced to the minimum: from just 27 mm to 62 mm and 77 mm depth. The endless variations of OS2 75 correspond to the needs of an architectural project which designs the window in every single detail, calibrating the borders with care to vary harmoniously the play of light and shadow on the façades, both interior and exterior. OS2 75 offers the possibility to realize different types of opening that can be freely composed in endless combinations in the glass curtain walls
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  • Key features
  • Technical Specifications
  • Performance
  • Thermal break steel windows for glazing of 50 mm,
  • profiles of 27 mm,
  • central section 62 mm and series of sashes in the prospectus
OS2 inward opening window is an integrated system with accessories, seals and thermal break profiles 77 mm deep allowing for a wide range of windows, rectangular, shaped or curved. They can be equipped with double glazing up to 50 mm thick. The system allows for the possibility to have a tilt & turn opening mechanism. The sealing of the door and window frames is guaranteed by a weep system with central sealing gasket and internal rebate seal
wind resistance - test pressure5
wind resistance - frame bendingC
water tightness9A
acoustic performance (with Rw per IGU 42dB)45 dB
thermal transmittance (with Ug glass 0,7 W/m2K)1,04 W/m²K*
air permeability4


We offer high variety of Aluminum windows and doors. Every order is custom made according to our customers requirements. Our modern construction solutions make it possible to create extremely large g lazed areas and improve building design and interior décor not available with most of our competitors, for example 25’ W x 9’H lift and slide doors. We have almost an unlimited potential in terms of both colors and their different shades for our aluminium components. Another key benefit for our products are the components utilizing multi point locking. This is achieved through a link gear running around the window sash, which operates pins which in turn lock into keepers located around the perimeter of the sash opening. Depending on the size of sash used, there can be up to twelve locking points on any one sash. In doors a six-point lock is used. This comprises of four compression roller pins, one latch and one dead bolt. All the locks on any one sash are operated by one lever and secured by one key. Further this creates insulating advantage as an even sash seal is achieved as well as enhanced security. Pleae note we can perform the installation or assit our customer in an installation consult capacity.


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Eco Windows USA provides top quality window and door solutions in Brass, Steel, Aluminum, Wood and PVC. With a capacity of producing over 5000 windows per day our systems are highly customizable, allowing for almost unlimited possibilities to arrange elevations and building interiors for both residential and commercial use. Our brand of window and door carpentry is produced by combining precisely selected materials, premium German hardware, latest technologies and long-term experience in production. We provide CAD design support as well as complete installation services.