Description
Chartwell Green uPVC Top Vent, Fixed and Full-Height Casement Window — Two Opening Styles, One Perfectly Resolved Frame
Some rooms need two completely different types of ventilation working independently — quiet background airflow at the top and generous full-height opening on the side — without either compromising the other or interrupting the fixed view pane that gives the window its sense of openness. Our Chartwell Green uPVC Top Vent, Fixed and Full-Height Casement Window delivers both opening styles in a single four-light made-to-measure frame that is as practically capable as it is visually resolved.
By combining a top-hung opening vent at the upper left, a fixed lower left pane for the view, and a full-height side-hung casement on the right that swings completely open from sill to head, this configuration covers the full range of ventilation need from the gentlest background refresh to the widest, most generous full-height opening — all within a frame that reads as a clean, considered Chartwell Green design on any elevation.
Left Section — Layered Function in Two Zones
The left-hand section of this window is divided into two distinct zones by a single horizontal rail, each serving a different purpose and each doing its job completely without interfering with the other.
At the upper left, the top-hung opening vent handles background ventilation. Opening outward from its top edge and tilting away from the frame, it creates a ventilation gap at the head of the left section through which warm stale air rises and escapes continuously at ceiling level. The top-hung mechanism is rain-resistant by design — the back face of the open sash deflects water away from the gap — making this vent suitable for continuous operation in all but the most severe weather. It can be left open overnight, through a working day, or during and after cooking without any concern about rain ingress or draughts at occupant level. The airflow it provides is gentle, directed upward, and consistent — the kind of background ventilation that makes a measurable difference to air quality and condensation control over time.
At the lower left, the fixed pane occupies the remainder of the left section below the horizontal rail. Requiring no operation, no hardware, and no maintenance beyond a wipe, it delivers a clear view at the seated and standing eye level that matters most — the height from which a garden, terrace, or outdoor space is most directly and comfortably experienced from inside the room. There are no handles, no hinge details, and no vent indicators interrupting the glazed area of the lower left section. Just clear A-rated double glazing in a slim Chartwell Green border, framing the left side of the outdoor space cleanly and without distraction.
The combination of active upper left and passive lower left within the same section gives this window a quiet compositional logic — the left section does two things at different heights without either compromising the other, and the horizontal rail between them is the single design element that makes that division legible and resolved.
Right Section — Full-Height Opening, Unrestricted
The full-height side-hung casement on the right is what distinguishes this configuration most dramatically from a standard combination casement — and what gives it its exceptional ventilation capability when active airflow is the priority.
Unlike a standard casement that sits within a divided section — below a top light, above a fixed sill rail, or beside a fixed pane — the right-hand casement here spans the complete height of the frame from sill to head without any horizontal division. There is no top light above it restricting its upper extent. There is no fixed lower section beneath it limiting the height of the opening. The sash occupies and opens the full vertical extent of the right-hand section, from the very bottom of the frame to the very top — creating a ventilation aperture of exceptional height when the casement is fully open.
This full-height opening on the right side of the frame delivers a volume and character of airflow that no partial-height casement can replicate. Fresh air enters from the right at every height level simultaneously — from floor level to ceiling level — flowing into the room in a wide, even column that reaches the upper zone, the middle zone, and the lower zone of the room simultaneously. For large rooms, open-plan spaces, and any interior where a single partial-height vent fails to circulate air effectively through the full height of the room, the full-height right casement makes an immediate and perceptible difference.
The casement opens outward on its right-hand hinge, swinging fully clear of the frame when maximum ventilation is required. It can be held at any intermediate position — from a narrow crack to fully open — by the friction of the hinge mechanism, allowing the occupant to control the volume of incoming airflow with precision at every setting. In the fully open position, the contrast between the active right section and the composed left section — top vent quietly working at the upper level, fixed lower pane framing the view below — is particularly striking from inside the room, where the full-height opening creates a genuine connection between the interior and the outdoor air.
Two Opening Styles, One Ventilation System
When both the top-hung vent and the full-height casement are open simultaneously, this window operates as a remarkably effective two-point ventilation system. The top-hung vent extracts warm air from the upper left of the room at ceiling level. The full-height casement introduces fresh air at every height level on the right side simultaneously. The result is a diagonal airflow pattern that draws air across the full width and height of the room — from the right-side inflow at every level to the left-side upper extraction — creating a thoroughness of air change that a single opening at one level and one side cannot approach.
This two-point ventilation capability — overhead extraction on the left combined with full-height inflow on the right — is particularly effective in rooms where heat, moisture, or cooking odours accumulate at ceiling level while the occupied zone is at mid-to-lower height. The top vent removes the accumulated warmth from above while the full-height casement replaces it with fresh air from floor level upward — addressing both the upper zone problem and the lower zone comfort simultaneously through a single, well-considered window configuration.
Thermal Consistency Across All Four Panes
All four panes in this double glazed uPVC window are specified 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 U-value of 1.3 W/m²K across the top-hung vent, the fixed lower left pane, and the full-height right casement — meeting Part L Building Regulations consistently across the full frame and delivering genuine reductions in heat loss through every section.
The horizontal rail in the left section is manufactured from the same 70mm multi-chamber profile as the outer frame, maintaining sealed air chamber thermal resistance at this internal frame element and preventing the cold bridge that develops at mid-frame rails in lesser profiles. The meeting stile between the full-height right casement and the fixed frame to its left is manufactured to the same exacting thermal standard — maintaining thermal performance at the sash-to-frame junction consistently with the fixed sections on both sides.
Chartwell Green — Heritage Quality on a Practical Design
In Chartwell Green, the four-light composition of this window — top vent upper left, fixed lower left, full-height casement right — has a clear visual logic that the sculpted profile reinforces and the heritage finish elevates. The horizontal rail on the left marks the division between the active upper and passive lower zones of the left section with the kind of crisp shadow detail that only a fully sculpted 70mm profile provides. The full-height right casement is bounded by a frame that gives it presence and definition rather than simply containing it. And the soft sage Chartwell Green tone runs consistently across every frame element — rail, mullion, outer border, casement stile — tying the four-light composition into a single cohesive design that looks resolved and considered from both inside and out.
The Chartwell Green finish is co-extruded into the uPVC profile, guaranteed not to fade, peel, warp or discolour, 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.
Security on Both Opening Lights
The top-hung vent and the full-height side-hung casement are each 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. Patented double-action bubble gaskets run the full perimeter of both opening lights, maintaining consistent weathertight and draught-proof seals in all conditions.
The full-height casement benefits particularly from the multi-point locking engagement across its full height — the locking points engage from the top to the bottom of the sash height, providing consistent compression of the weather seal and consistent resistance to forced entry along the complete length of the opening edge.
Specification at a Glance
- Energy Rating: A-rated | U-value 1.3 W/m²K
- Configuration: 4-light — top-hung vent upper left, fixed lower left pane, full-height side-hung casement 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 full-height 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 for sizing queries, configuration advice, and handing guidance before you place your order.
When Background Ventilation and Full-Height Opening Both Matter
Most combination windows give you one type of opening — a vent for background ventilation or a casement for active airflow, but rarely both in the same frame at different heights and on different sides. This four-light configuration gives you both simultaneously and independently. The top-hung vent works quietly at the upper left whenever the room needs background refresh. The full-height right casement opens completely whenever the room needs serious ventilation. The fixed lower left pane keeps the view open at eye level regardless of what the opening lights are doing. And the Chartwell Green frame ties all three functional zones together with the heritage finish and profile quality that make this one of the most practically capable and visually coherent designs in our entire Chartwell Green uPVC window range.
