Chartwell Green UPVC Window-design 79

Description

Chartwell Green uPVC Wide Combination Casement Window with Central Top Vent — Perfect Symmetry, Complete Ventilation, Unobstructed View

Perfect bilateral symmetry in a wide combination window is rare — and when it is achieved alongside complete multilevel ventilation control, an unobstructed central picture pane, and consistent A-rated thermal performance across six lights, the result is genuinely exceptional. Our Chartwell Green uPVC Wide Combination Casement Window with Central Top Vent achieves all of this in a single made-to-measure frame — a six-light design of unusual completeness that serves wide openings in large rooms with a combination of light, view, airflow, and architectural presence that no asymmetric configuration can match.

This is the window for rooms where the wall opening is the dominant architectural feature, where the view outside is worth framing perfectly, and where the ventilation should work at every level simultaneously — from the ceiling zone through the central overhead vent to the full-height bilateral airflow through the twin lower casements.

Perfect Bilateral Symmetry — Why It Matters at This Scale

At the width this window is designed to span, the visual impact of bilateral symmetry is far greater than at narrower scales. When a six-light frame is balanced perfectly around a central vertical axis — with identical arrangements on the left and right sides of that axis at every level — the window reads from any viewing distance as a single, resolved architectural composition rather than a collection of different light types assembled across a wide opening.

In this configuration, the symmetry axis runs through the centre of the frame at every level simultaneously. In the upper section, the central top-hung vent sits precisely at the midpoint, flanked by equal fixed top lights on both sides. In the lower section, the wide central fixed picture pane sits precisely at the midpoint, flanked by equal side-hung casements on both sides. The horizontal rail between the upper and lower sections runs continuously at the same height from edge to edge. The vertical dividers between the upper and lower sections align at the same positions on both sides. Every element of the six-light composition mirrors its counterpart across the central axis — and the result is a window that looks as though it was designed by an architect rather than selected from a catalogue.

In Chartwell Green, this bilateral symmetry is amplified by the consistent soft sage tone running across every frame element from edge to edge — head, sill, rail, dividers, outer stiles — unifying the six-light composition into a single coherent whole. From the street, this window makes one of the strongest and most considered impressions of any configuration in the range.

Three Upper Lights — Symmetrical Ventilation at Ceiling Level

The upper section of this window is governed by the central top-hung opening vent, positioned precisely at the midpoint of the upper row between the two fixed flanking top lights. Opening outward from its top edge, the central vent creates a ventilation gap at the head of the centre upper section through which warm air rises from the room and exits at ceiling level continuously.

The top-hung action makes this vent rain-resistant — the outward-tilting sash deflects water away from the gap at its top edge — allowing it to remain open in light rain, overcast conditions, and overnight without supervision or concern about water ingress. For a room of this width, where warm air can accumulate and stratify in the upper zone during cooking, heating, and occupation, the central overhead vent provides a continuously effective pathway for stale warm air to exit — maintaining air quality across the full width of the room through a single, discreetly positioned ventilation light.

The central positioning of the vent within the upper row is thermally and aerodynamically significant as well as aesthetically. By extracting air from the midpoint of the room’s width rather than from one side, the overhead ventilation draws room air evenly from the full width of the space — including the areas furthest from the lower side casements — creating more balanced and thorough air exchange than an off-centre overhead vent could achieve.

The two flanking fixed top lights contribute natural light to the ceiling zone across the full width of the opening simultaneously — brightening the ceiling and upper walls from edge to edge and giving the room the sense of vertical expansion that wide upper illumination produces.

Three Lower Lights — Bilateral Airflow and Central View

The lower section of this window is where the ventilation capability is at its most powerful — and where the relationship between the opening lights and the fixed central pane creates the most practically useful arrangement in the six-light frame.

The twin side-hung casements on the far left and far right of the lower section open fully outward on their respective outer hinges when strong ventilation is needed. When both casements are open simultaneously, they create bilateral airflow across the full width of the lower section — fresh air entering from the left, exiting on the right, or fresh air entering from both sides simultaneously depending on the external wind conditions and the occupant’s preference. For large open-plan spaces and wide rooms where a single opening on one side fails to circulate air effectively across the full room width, this bilateral lower ventilation is practically transformative.

The full height of both lower casements — from just above the sill to the underside of the horizontal rail — means the ventilation aperture on each side extends over the full lower height of the opening, delivering airflow at every level from floor-adjacent to ceiling-adjacent simultaneously. This full-height bilateral ventilation, combined with the central overhead top-hung vent extracting air from the upper zone, creates a three-point ventilation system across the six-light frame that covers the ceiling level, the left lower level, and the right lower level independently and simultaneously — a depth of ventilation control that no combination window with fewer than three opening lights can match.

Between the two lower casements, the wide central fixed picture pane spans the full lower centre of the frame without any opening hardware interrupting its glazed surface. At seated and standing eye level, this central fixed pane presents the outdoor space — garden, terrace, landscape — as a clean, unobstructed view across the full width of the central section. No meeting stile, no handle, no vent indicator breaks the view at the height where it is most directly experienced. The outdoor space is seen clearly and continuously through the central lower section regardless of whether the flanking casements are open or closed.

A-Rated Performance Across All Six Panes

All six panes in this double glazed uPVC window are specified and manufactured to the same thermal standard. The 70mm multi-chamber uPVC frame, 28mm argon-filled sealed units, soft coat low-E glass, and warm-edge black superspacer bar deliver a consistent U-value of 1.3 W/m²K throughout — across both fixed top lights, the central top-hung vent, both side-hung casements, and the central fixed picture pane — meeting Part L Building Regulations across the full six-light width without variation between sections.

The horizontal rail is the thermally critical element at this scale — a continuous frame element crossing the complete internal width between the upper and lower sections. Our 70mm multi-chamber construction maintains sealed air chamber thermal resistance at the rail with the same consistency as at the outer frame, eliminating the cold bridge that develops at full-width rails in lesser profiles and preventing the condensation strip that would otherwise form at this junction in cold weather.

The meeting stiles between the opening casements and the fixed outer frame and fixed central sections are manufactured to the same exacting thermal standard as the rest of the frame — maintaining thermal resistance at the sash-to-frame junction consistently with the fixed sections on both sides.

Security Across Three Opening Lights and Six Panes

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

Specification at a Glance

• Energy Rating: A-rated | U-value 1.3 W/m²K
• Configuration: 6-light — fixed top light upper left, central top-hung vent, fixed top light upper right, side-hung casement lower left, wide central fixed picture pane, side-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 all three opening lights
• Handles: Lockable push-button handles on all three opening lights
• Beading: Internal across all six panes for maximum security
• Gaskets: Patented double-action bubble gaskets on all three 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 across the full width of your opening. Our team is available for sizing queries, configuration advice, and specification details before you place your order.

Symmetry, Ventilation and View — All Three, at Full Scale

Most wide combination windows achieve two of these three qualities — symmetry or ventilation or unobstructed view — and compromise on the third. This six-light design achieves all three simultaneously and at their fullest scale. Perfect bilateral symmetry across every level of the frame. Three independent opening lights covering overhead, left lower, and right lower ventilation simultaneously. A wide unobstructed central fixed picture pane preserving the panoramic view at eye level regardless of operating conditions. And the sculpted Chartwell Green frame tying all six lights together with a heritage finish and profile quality that make this the most symmetrical, most capable, and most architecturally distinguished design in our entire Chartwell Green uPVC window range.