White · 3D previewWhite · 3 frame colors
Interior Storm Windows
Compression, sliding, double hung, and surface-mounted panels for the inside of your opening.
Explore collectionTriple-Track Horizontal Slider Storm Window
Mill (Silver) · 3D previewDrag to turn. Pinch or scroll to zoom. Open the sash to see how it moves.
Illustrative model. Your dimensions, frame profiles, and hardware may differ. Refer to the product photos and confirmed specifications.
Product description
The horizontal counterpart to our flagship triple-track vertical, this unit runs two glass sashes and two fiberglass screens inside a hollow-tube aluminum frame engineered for side-loading openings. Independent channels let you slide either panel without disturbing the other, and the tubular extrusion holds geometry on wide spans where lighter frames sag over time. A strong choice when you need full-pane ventilation across a horizontal opening without sacrificing winter sealing.
Benefits
Horizontal OperationTwo ScreensFlexible Airflow
- Independent tracks provide ventilation from either side of the opening
- Two glass panels and two screens support flexible seasonal use
- Available in two-lite or three-lite layouts for wider spans
- Custom dimensions and pane orientation suit non-standard sliders
Why you'll love it
- Our most versatile horizontal system for wide openings and frequently used windows.
- The three-track design offers more airflow control without replacing the primary window.
Product specifications
- Custom sizes up to 108" wide by 60" high
- Frame finishes: Mill (Silver), White, Tan, Bronze, Black
- Glass options: clear, P62 obscure, or tempered safety glass
- Screen options vary by configuration and selected material
How to measure
- Take three width and three height readings, then mark the smallest of each as opening fit checks.
- Choose a two-lite or three-lite layout before confirming the operating side.
- For three-lite units, record the desired fixed center-lite width.
Installation and care
- Keep the sill perfectly level across the full span.
- Test every panel and screen for smooth travel before tightening the perimeter fasteners.
Common pairings
See other commonly purchased window types
White · 3D preview
Mill (Silver) · 3D previewMill (Silver) · 5 frame colors
Vertical Storm Windows
Classic protection for double-hung and tall sash openings.
Explore collection
Mill (Silver) · 3D previewMill (Silver) · 5 frame colors
Picture Storm Windows
Fixed storm panels for large views, transoms, and stationary glass.
Explore collectionNeed help choosing?
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