Chartwell Green UPVC Window-design 72

Description

Chartwell Green uPVC Fixed and Double Top-Hung Combination Casement Window — Maximum Left Light, Complete Right Ventilation

Our Chartwell Green uPVC Fixed and Double Top-Hung Combination Casement Window is the right-hand mirror of our twin top-hung combination — and it brings the same exceptional stacked ventilation capability to openings where the view worth keeping is on the left and the ventilation belongs on the right. Two fixed panes occupy the full left section of the frame without a single piece of hardware interrupting the glazed area, while two independently operated top-hung opening lights stacked vertically in the right section provide a depth and range of ventilation control that no single-light combination can approach.

This is a window built around a clear principle — that the left side of this opening faces something worth looking at, and the right side is where the room breathes. Every element of the configuration serves that principle directly.

The Right Section — Stacked Top-Hung Ventilation

The right-hand section of this window is divided horizontally by a single rail into an upper and lower zone, each containing its own independently operated top-hung opening light. The stacking of two top-hung lights in the same vertical section is the defining feature of this design — and the source of its most distinctive practical advantage.

At the top of the right section, the upper top-hung vent opens outward from its upper edge to create a narrow ventilation gap at the head of the frame. This is the background ventilation light — the one designed to be left open continuously through the day and night without supervision. The top-hung mechanism deflects rain away from the opening naturally, so this vent can remain open in light rain, overcast weather, and cool evenings without any concern about water entering the room. Warm stale air rises from the room and escapes at ceiling level through this vent, maintaining a constant gentle refresh of the room atmosphere that is felt in air quality and thermal comfort rather than as a noticeable draught.

Below the horizontal rail, the large lower top-hung casement occupies the full lower height of the right section. This is the active ventilation light — considerably larger than the upper vent, opening outward from its top edge across a wide arc to create a substantial ventilation aperture at the lower right of the frame. The volume of airflow through this opening when fully extended is significantly greater than through the upper vent alone, making it the light to open when the room needs serious ventilation — after cooking, during warm weather, following exercise, or whenever a rapid and thorough air change is the priority.

The two right-hand top-hung lights work together to create a natural convective flow when both are open simultaneously. The large lower casement draws fresh air in at the lower level while the upper vent allows warm air to escape at the head — a gentle stack effect that turns room air over more thoroughly than a single opening at one height could achieve. Alternatively, either light can be operated alone according to the ventilation requirement at any given moment — the upper vent for quiet background refresh, the lower casement for active circulation — giving the occupant a degree of ventilation control that most combination windows do not provide.

The consistency of using top-hung opening lights throughout the right section is both practical and aesthetic. Both lights share the same opening mechanism, the same weather resistance characteristics, the same profile depth and detail, and the same visual language — giving the right section a coherence and intentionality that a mixed top-hung and side-hung arrangement cannot match.

The Left Section — Uninterrupted View and Light

The left-hand section of this window is the complement to the active right section — and its job is to stay out of the way of the view and the light as completely as possible. Two fixed panes — one in the upper left position and one in the lower left position, separated by the same horizontal rail that divides the right section — span the full height of the left section from sill to head without a single handle, hinge, lock, or vent indicator interrupting the glazed area.

The lower left fixed pane is the primary viewing pane of the window — the light through which the garden, the courtyard, the planted border, or whatever outdoor space this window faces is seen most directly and most clearly. Positioned at seated and standing eye level without any frame element crossing its surface, it delivers the cleanest possible view of the outside at exactly the height where the view is experienced most directly. For rooms where the connection to the garden or outdoor space is a significant part of the room’s purpose — a kitchen that faces the garden, a dining room that looks onto a terrace, a sitting room with a planted aspect — this fixed lower left pane ensures the window serves that purpose without compromise.

The upper left fixed pane above the rail completes the left section at the head of the frame. Sitting at the same height as the upper top-hung vent on the right, it maintains the horizontal proportional consistency of the upper frame across the full width — the rail reads as a single continuous element tying both sections together — and contributes additional natural light to the upper left of the room, brightening the ceiling and the upper wall zone in a way that a left section without an upper pane could not achieve.

Together the two left-hand fixed panes create a glazed section that is completely open to the view, completely free of hardware, and completely devoted to bringing light into the room across the full height of the left section. The contrast between this clean, passive left section and the active, purposeful right section gives the four-light composition a clear visual and functional logic that is immediately readable from both inside and outside the property.

Thermal Performance Without Variation

All four panes in this double glazed uPVC window are built and specified to the same thermal standard throughout. The 70mm multi-chamber uPVC frame, 28mm argon-filled sealed units, soft coat low-E glass, and warm-edge black superspacer bar deliver a U-value of 1.3 W/m²K consistently across every light — fixed and opening alike — meeting Part L Building Regulations across the full frame and delivering genuine, measurable reductions in heat loss in everyday use.

The horizontal rail crossing the full internal width of the frame at mid-height is thermally the most demanding element of this window — a continuous structural member with inside and outside surfaces that creates a potential cold bridge in lesser profiles. Our 70mm multi-chamber construction addresses this with the same sealed air chamber design used throughout the outer frame, maintaining consistent thermal resistance at the rail and eliminating the condensation strip that forms at mid-frame rails in single-chamber or thinly profiled alternatives.

The warm-edge black superspacer bar works across all four sealed units simultaneously, replacing the thermally conductive aluminium spacer bar of lower-specification units with a low-conductivity alternative that keeps the glass edge warm and condensation-free at every pane. The result is a window that performs consistently from the outer frame corners to the central mullion, from the head to the sill, and from the fixed left section to the active right section — at the same standard, in the same conditions, throughout the year.

A Resolved Four-Light Composition in Chartwell Green

The bilateral logic of this window — fixed on the left, active on the right, horizontal rail tying both sections at the same height — creates a four-light composition with a clear, resolved structure. The Chartwell Green frame reinforces that structure at every level. The fully sculptured 70mm profile gives the horizontal rail, the central mullion, and the outer border the moulded depth and shadow detail that distinguish a quality window from a flat, uniform plastic frame. The soft sage heritage tone of Chartwell Green sits across the full composition with the confidence of a finish that has been part of quality British window design long enough to have proven itself on every property type and in every weather condition.

The Chartwell Green finish is co-extruded into the uPVC profile — inseparable from the frame material, immune to peeling and fading, and backed by a full 10-year profile guarantee. These uPVC casement windows require no painting, no staining, and no maintenance beyond an occasional wipe with a damp cloth. Both top-hung opening lights can be cleaned on their outer faces from inside the room when open — a practical benefit that becomes increasingly valuable the higher the window is positioned.

Security Across All Four Panes

Both top-hung opening lights are independently secured with multi-point locking systems engaging at multiple points along the opening perimeter of each light. Lockable push-button handles are fitted to both opening lights as standard. All four panes across the full frame are retained by internal glazing beads, preventing glass removal from the exterior on any section — fixed or opening. Patented double-action bubble gaskets run the full perimeter of both top-hung lights, maintaining a consistent draught-proof and weathertight seal in all conditions, including when only one of the two right-hand lights is in use.

Specification at a Glance

• Energy Rating: A-rated | U-value 1.3 W/m²K
• Configuration: 4-light — fixed pane upper left, top-hung vent upper right, fixed pane lower left, large top-hung casement lower right
• Frame System: 70mm multi-chamber thermally efficient uPVC
• Glazing: 28mm argon-filled units, soft coat low-E glass, warm-edge superspacer
• Locking: Multi-point locking on both top-hung opening lights
• Handles: Lockable push-button handles on both opening lights
• Beading: Internal across all four panes for maximum security
• Gaskets: Patented double-action bubble gaskets on both opening lights
• Finish: Chartwell Green — guaranteed not to discolour, warp or peel
• Compliance: Part L Building Regulations
• Guarantee: 10-year profile guarantee

Made to Your Exact Measurements

• Frame Width: 415mm – 700mm
• Frame Height: 800mm – 2200mm

Every window is manufactured to order to your precise dimensions. Enter your measurements at checkout for a perfect made-to-measure fit. Our team is available for sizing queries, handing advice, and configuration guidance — including whether the left-hand or right-hand twin top-hung configuration better suits your specific opening — before you place your order.

When the View Is on the Left and the Room Breathes on the Right

The best window for any opening is the one that works with the room’s geometry rather than against it. When the outlook is on the left and the ventilation belongs on the right, this fixed and double top-hung combination puts every element exactly where it needs to be. Two clean fixed panes on the left frame the view without interference. Two independently operated top-hung lights on the right deliver background ventilation, active airflow, and everything between — quietly, effectively, and in all weathers. The Chartwell Green frame ties both sections together with a heritage finish and profile quality that make this one of the most practically intelligent and visually coherent designs in our entire Chartwell Green uPVC window range.