900 Series Double Hung Fiberglass Windows
Classic double hung operation, built with the strength and stability of our fiberglass windows.
A Better Double Hung Window Starts with the Frame
The 900 Series gives buyers the familiar look and function of a double hung window, but with the advantages of Inline’s fiberglass platform.
The current 900 Series page highlights exceptional strength, wide temperature tolerance, energy savings, condensation and humidity control, customization flexibility, and double pane glass availability.
Inline’s fiberglass windows are built around long-term performance. Fiberglass helps support strength, dimensional stability, and clean sightlines, making it a practical choice for projects where comfort, durability, and appearance all matter.
Advantages of the 900 Series
The Inline Fiberglass 900 Series is designed for homeowners, builders, and project teams who want a traditional double hung window with modern performance advantages. Both the top and bottom sashes operate, giving you flexible ventilation, easier cleaning access, and a clean window style that works well in residential, renovation, and selected light commercial applications.
Key benefits:
- Top and bottom sash operation for better airflow
- Tilt-in sash access for easier cleaning from inside
- Pultruded fiberglass frame strength and dimensional stability
- Available with double pane glass options
- Custom colour and finish options available
- Designed for comfort, energy efficiency, and long-term performance
Where the 900 Series Double Hung Window Fits Best
The 900 Series is a strong fit for projects that need a traditional window style with flexible ventilation and everyday practicality. The double hung design allows both the upper and lower sashes to operate, giving homeowners greater control over airflow while maintaining the classic appearance.
Living Rooms
Bring natural light and fresh air into gathering spaces with a traditional window design that complements a wide range of home styles.
Traditional Home Designs
The classic double hung appearance works well with heritage-inspired, transitional, and traditional architectural designs.
Renovation Projects
Upgrade older windows while maintaining the familiar look many homeowners prefer, with the added benefits of modern fiberglass construction.
Bedrooms
The 900 Series is a practical choice for bedrooms, offering flexible ventilation options and a familiar operating style that is easy to use every day.
Flexible Ventilation
Open the lower sash, upper sash, or both to help support natural airflow and improve comfort throughout the room.
Hard-to-Reach Locations
The double hung design can make cleaning and maintenance more convenient in upper-floor rooms and areas where exterior access is limited.
Built for Comfort , Efficiency, and Humidity Control
The 900 Series is designed to help support better interior comfort. Its fiberglass frame platform, insulating glass options, and double pane availability help reduce the common trade-off between traditional window styling and modern performance.
For homeowners, that can mean a more comfortable room and less worry about drafts, condensation, and seasonal temperature swings. For builders and specifiers, it means a double hung option that can be considered for projects where durability, appearance, and energy performance all matter.
Available performance options may include:
- Double pane glass
- IGMAC-certified insulating glass units
- Low-E coating options, including 180, 272, 366, and i89
- Standard, semi-standard, and custom colour options
- Product documentation for planning and review
Final glass package, NFRC performance values, and Energy Star eligibility should be confirmed for the specific unit size, glazing configuration, and project requirements.
Classic Window Style, Custom Project Details
The 900 Series works well when the project calls for a clean, traditional window style without giving up customization. Inline supports standard, semi-standard, and custom colour options, with standard and oversized product configurations available depending on project requirements.
Customize the 900 Series with:
- White standard colour
- Semi-standard colours including Commercial Brown, Almond, Brownstone, Slate, Tricorn Black, and Iron Ore
- Custom colours
- Double or pane glass options
- Low-E coating options including 180, 272, 366, and i89
- Standard or oversized product configurations
See the 900 Series in Real Spaces
Explore how the 900 Series is used across homes and projects where ventilation, comfort, and clean architectural design are priorities.
900 Series
Drawings and Installation Resources
Planning a project? Access available 900 Series technical documents to help with product review, specification, and installation planning.
900 Series Drawings — PDF
Download product drawings to assist with project planning, design review, and development.
900 Series Drawings — CAD
Access CAD drawings to support project design, planning, and specification development.
Installation Guide
Review installation information for single 900 Series units.
For project-specific performance data, certification documentation, or glass package confirmation, contact Inline Fiberglass before final specification.
Common Questions About 900 Series Double Hung Window
Find clear answers to common questions about fiberglass windows, including product options, performance considerations, and how to choose the right solution for your project.
Where is the 900 Series best used?
The 900 Series is best used in homes and projects where a traditional double hung window style is preferred. It works well for bedrooms, living areas, upper floors, renovation projects, and spaces where top-and-bottom ventilation is useful.
What makes the 900 Series different from a single hung window?
A single hung window has one operating sash and one fixed sash. A double hung window allows both the top and bottom sashes to operate. This gives you more ventilation control and makes cleaning easier.
Is the 900 Series energy efficient?
The 900 Series can be configured with double or triple pane glass and Low-E coating options. Energy Star eligibility depends on the selected glazing configuration, and exact performance values should be confirmed through NFRC for the specific unit.
Can I choose custom colours?
Yes. White is the standard colour; Commercial Brown, Almond, Brownstone, Slate, Tricorn Black, and Iron Ore are semi-standard colours; and anything else is custom.
Is the 900 Series available for commercial projects?
The 900 Series may be suitable for selected commercial, multi-residential, or light commercial applications depending on the project requirements. For larger or more technical projects, request product support so Inline can confirm the best series, glass package, and documentation.
Are drawings available?
Yes. The 900 Series page above includes links for drawings, CAD drawings, and installation documents.
Is the 900 Series Passive House certified?
For high-performance project requirements, contact Inline to confirm the right product, glazing package, and certification documentation.
Ready to Plan Your 900 Series Window Project?
Tell us about your project and our team will help you take the next step. Whether you are replacing windows, planning a custom home, preparing architectural drawings, or reviewing options for a commercial project, Inline Fiberglass can help you confirm the right product path.
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