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Mulled Windows

Combining multiple glazing systems without the need for additional framing.

Mulled Window Systems

Many applications, both residential and commercial, utilize doors, windows, and curtain walls in a single unit. There are many limitations, restrictions, and sizes that produce results that look uniform, but lack quality. Solar Innovations® offers a window and door system that combats these issues and provides customers with a well designed, quality product.

The Mulled Window and Door System has been designed to maximize flexibility by joining a series of operable windows and swing doors to create one cohesive system without additional rafters or framing, while maintaining consistent, minimally interrupted site lines. Solar Innovations, Inc. is proud to manufacture one of the most flexible window wall systems available in the industry today.

Window Integration

Flexibility is one of the distinguishing factors of any Solar Innovations®. product.  This system allows end users to make unique selections and provides flexibility in design by integrating awning, casement, hopper, fixed, tilt turn, and egress windows (depending on local code) all within the same unit. These systems create a modern, sleek, customizable option for any project.

Door Integration

Solar Innovations® mulled window system allows the combination of as many doors and windows as desired, without the need for additional framing. Units typically stay below 12’ in height, but can be as wide as the customer desires. The 4-inch site line system creates a modern, sleek, and customizable option for any project. Single terrace doors and French doors are capable of integration into the same system.


Coastal Applications

Our systems have the option to be both coastal and non-coastal. Because we use stainless steel hardware, our materials withstand the corrosive effects of the elements in these coastal regions.

Custom Engineering for Custom Glazed Windows and Doors

Custom Engineered

Each Solar Innovations® system is custom made to order based on your project needs and preferences. Therefore, our team of engineering experts has you covered.

Sustainable Products

Solar’s products are manufactured with outstanding thermal performance, durable framework, and sustainable materials, therefore, making it a great option for your next project.

Glass Variety

Solar Innovations ® has top of the line glazing solutions which include laminated, dual glazed, triple glazed, in addition to our marine glazed options just to name a few.

 In-swing & Out-swing Options

Another exclusive feature Solar Innovations® provides to customers is the ability to select both in-swing or out-swing windows within the same system, unlike many competitors’ systems which can accommodate only one option. In-swing and out-swing terrace doors, with ADA compliant sills, can be built into the window system.  Fixed transoms can also be added to these systems over both windows and terrace doors.  This level of customization allows designers to create a unique system for any application.


The Mulled Window System can be a combination of fixed panels and operable windows in one unit. Solar Innovations®’ Mulled Window system can be composed of any number of fixed, awning, hopper, and casement windows. Unlike the systems of many other manufacturers, Solar’s window system can include both inswing and outswing windows in one structure, creating a truly unique and customizable system. The Mulled Window system is also NFRC certified. Customization of product profiles, hardware, sills, panel size, and testing can be completed upon request.



Water performance, up to 15 psf, depending upon configuration and water columnIn-system frame flanges, snap-in nailing fins, or slide on nailing flanges
Thermally enhanced utilizing thermal strutDecorative interior & exterior grids
Operable hardware custom manufactured by Solar Innovations®Fixed mesh insect screens
Systems include fixed, casement, awning, tilt turn, tilt slide, hopper and egress windowsCustom finishes:
Multiple hardware styles and finishesPowder coat finish: AAMA 2604-2605
Accommodates monolithic and insulated glazing infills from 3/16″ to 1 1/2″Fluoropolymer (50% or 70%): AAMA 2604-2605
Consistent sightlines within systemVeneer and cladding options
AAMA 2603 Standard Finishes:
Hartford Green, Bronze, Black, Natural Clay, White, Sandstone
Dual color or dual finish options
Class I Anodized: Dark Bronze, ClearMultiple sill designs, including ADA compliant ramps
LEED friendly system including recycled conteDesigned to accommodate almost any monolithic, insulated, and laminated
Maximum size dependent upon engineering requirements
Designed and manufactured in the U.S.A.