Chartwell Green UPVC Window-design 68

Description

Chartwell Green uPVC Combination Casement Window with Top Vent and Side Casement — Diagonal Ventilation, Refined Balance

Effective ventilation is not just about how much air a window lets through — it is about where the air enters and exits, and at what level. Our Chartwell Green uPVC Combination Casement Window with Top Vent and Side Casement approaches this question with uncommon intelligence. By positioning a top-hung vent at the upper left and a side-hung casement at the lower right of a four-light frame, it creates a diagonal ventilation arrangement that moves air across the full height and width of the window simultaneously — delivering more effective air circulation than any single-level opening configuration can achieve.

This is a window designed for rooms where air quality, thermal comfort, and natural light all matter — and where the configuration of the window should work with how the room is used rather than simply filling the opening.

Diagonal Ventilation — Why It Works

The positioning of the two opening lights in this design is not accidental. When both the top-hung vent and the side-hung casement are open simultaneously, air enters and exits at diagonally opposite points of the frame — upper left and lower right. This diagonal arrangement creates a natural convective pathway through the window: warm air rises and escapes through the top-hung vent at the upper left, while cooler replacement air enters through the lower portion of the open right-hand casement. The resulting airflow moves across the full diagonal of the window opening rather than simply in and out at a single level.

In practical terms, this means more thorough ventilation with less actual opening area required. The room air turns over more completely, warm stale air is removed more efficiently, and the incoming fresh air reaches a greater proportion of the room before it mixes with the existing air mass. For kitchens where heat and cooking smells accumulate at ceiling level, for bathrooms where steam rises and needs to escape at height, and for any room where air quality and thermal comfort need to be managed simultaneously, this diagonal ventilation arrangement delivers results that a pair of side-hung casements at the same height simply cannot match.

The top-hung vent operates independently of the side-hung casement — each can be opened or closed without affecting the other. The top-hung vent alone provides quiet, continuous background ventilation that can be maintained around the clock without supervision, in all but the most severe weather. The side-hung casement alone provides strong, directed airflow when more active ventilation is needed. Both open together for the full diagonal effect when the room needs thoroughgoing air circulation.

Fixed Panes That Earn Their Place

The two fixed panes in this design are not simply passive sections filling the frame around the opening lights — they are active contributors to the overall performance and character of the window.

The large fixed lower left pane occupies the most visually prominent position in the frame — the lower left section where the eye naturally settles when looking at the window from inside the room. Spanning the full lower height of the left section without any horizontal rail dividing it, it delivers a clean, unobstructed view and floods the room with natural light at seated eye level. There are no handles, no hinges, and no visible hardware to interrupt the glazed area or the outlook beyond it.

The fixed top light on the upper right completes the four-light composition at the head of the right section, sitting above the side-hung casement and maintaining the proportional balance of the upper frame across the full width. Its presence ensures the window reads as a cohesive four-light unit rather than an asymmetric combination of opening and fixed sections pushed together — and it contributes additional light to the upper right of the room in a way that a frame without it could not.

Thermal Performance Across All Four Lights

Every pane in this double glazed uPVC window is specified to the same high 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 — A-rated performance that meets Part L Building Regulations and delivers genuine, sustained reductions in heat loss in everyday use.

The horizontal rail between the top-hung vent and the fixed lower left pane, and the corresponding rail between the fixed top light and the side-hung casement, are both manufactured from the same 70mm multi-chamber profile as the outer frame — maintaining thermal resistance at these potential weak points rather than compromising it. The warm-edge superspacer bar addresses the glass edge cold strip across all four sealed units simultaneously, keeping every section of the window condensation-free in cold weather.

A Window That Looks as Considered as It Is

The asymmetric four-light arrangement of this window — top-hung vent upper left, fixed top light upper right, large fixed pane lower left, side-hung casement lower right — creates a composition that is visually dynamic without being restless. The diagonal relationship between the two opening lights gives the frame a sense of movement and purpose that a symmetrical arrangement cannot achieve, while the two fixed panes provide the visual stability that anchors the composition.

In Chartwell Green, this dynamic balance is particularly effective. The soft sage tone of the frame ties all four lights together into a single resolved design, and the fully sculptured 70mm profile gives each element — the horizontal rails, the central mullion, the outer border — the moulded depth and shadow detail that distinguishes quality window manufacturing from commodity production. These uPVC casement windows look as though the configuration was chosen deliberately for this specific opening — because the proportions and finish give them that sense of intention.

The Chartwell Green finish is co-extruded into the uPVC profile and carries a full 10-year profile guarantee against fading, peeling, warping, and discolouration. Maintenance across all four panes requires nothing beyond an occasional wipe with a damp cloth.

Security on Both Opening Lights

Both the top-hung vent and the side-hung casement are independently secured with multi-point locking systems that engage at multiple points along the height and width of each opening light respectively. 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. Patented double-action bubble gaskets seal the full perimeter of both opening lights, maintaining a consistent draught-proof and weathertight barrier in all conditions — including when only one of the two opening lights is in use.

Specification at a Glance

• Energy Rating: A-rated | U-value 1.3 W/m²K
• Configuration: 4-light — top-hung vent upper left, fixed top light upper right, large fixed pane lower left, 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 top-hung vent and side-hung casement
• 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 to discuss configuration suitability, sizing, and specification details before you place your order.

When Ventilation Needs to Work at Every Level

Most combination windows ventilate at one height or one side. This one ventilates diagonally — drawing air across the full height and width of the frame simultaneously through two independently operated opening lights positioned at opposite corners of the four-light composition. The top-hung vent handles ceiling-level background ventilation quietly and continuously. The side-hung casement handles lower-level active ventilation powerfully and directly. The large fixed lower left pane keeps the view open and the room bright. And the Chartwell Green frame ties every element together with a finish and profile quality that make this one of the most distinctive and practically intelligent designs in our entire Chartwell Green uPVC window range.