The elegance of a hidden sash at an affordable price – MB-79N US

A modern façade with multiple windows looks best with a hidden sash option, where the whole appears as fixed glazing while keeping full functionality. Now you can offer your client this prestigious solution at an attractive price thanks to MB-79N US windows.

Prestige at your fingertips

Don't let the price limit your plans. The MB-79N US aluminium window and door system, which is just entering our product range, is a solution many of your clients have been waiting for and has the potential to sell well from day one. It has all the essentials:

• a hidden sash, meaning the striking look of a fixed window with full functionality,
• good thermal performance, which, especially in the SI option, will impress clients,
• an attractive price, which is often a barrier in the premium segment.

Warmth, tightness, plus the MB product family you know well – the MB-79N US is a modification of the well-known and highly regarded MB-79N system, so nothing will surprise you here. Also, note the 3 different drainage options you can choose according to the client's needs.

The answer to all clients' needs

• lower heating bills – the system's high thermal parameters and glazing up to 52.5 mm thick, together with warm edge spacers on promotion, minimise energy losses, thereby reducing bills;
• cooler interiors in summer – the use of selective glass, such as Guardian Sun, will allow you to block the heat pouring into your clients' interiors, reducing the indoor temperature by up to 4 degrees*;
• less frequent window condensation – using Guardian ClimaGuard Dry glass in the glazing unit will reduce the risk of condensation, which will be appreciated by everyone, especially owners of guesthouses, offices, and public buildings;
• privacy and shading with blinds that never get dirty – with Eko-Okna's integrated blinds, you provide your clients with a fully-fledged blind safely hidden inside the glazing unit, protected from dust and remote-controlled;
• smart controlled privacy with Digi Glass – glass that changes transparency at the user's will from full privacy to full transparency in a fraction of a second, consumes small amount of electricity, and can additionally be divided into four independently controlled segments.

Convince your clients with functionality you can create in cooperation with our sales department or by yourself, at any time, day or night, in our eko4u B2B tool.

*Based on an independent simulation study conducted in Wrocław by Group14 Engineering, comparing two identical rooms with triple glazing — one with Guardian Sun 39 glass, and the other solely with standard thermal insulation glazing — under identical building and climatic conditions, according to the report "Energy Modeling of Internal Room Temperatures For Guardian Glass, Phase 2, 16 December 2025".