The Verplas 110x54mm Louvred Grille (VKC233) is a fixed external wall terminal designed for use with Verplas's rectangular System 100 flat channel ducting. Moulded in tough, UV-stabilised polypropylene, it fits directly onto the rear 110 x 54mm male spigot, giving a low-profile external finish for extract or intake ventilation runs behind kitchens, bathrooms, and utility spaces.
The angled louvre blades shed driving rain while remaining permanently open, so airflow is unobstructed and there's nothing for the installer to adjust or commission. The front louvre panel clips apart from the rear spigot plate using a flat-head screwdriver, giving easy access for inserting insect mesh or for periodic cleaning. This listing covers all four standard finishes — White, Beige, Brown, and Terracotta — sharing identical dimensions and performance.
110 x 54mm
Grille & Spigot Size
Male Spigot
Connection Type
Fixed Louvre
Grille Style
Key Features
Weather-Resistant Louvres
The angled blade profile is engineered to deflect wind-driven rain away from the duct opening while the grille stays permanently open — no shutters or moving parts to seize, stick, or need adjustment over time.
Direct Male Spigot Fit
The rear 110 x 54mm male spigot pushes straight into Verplas System 100 flat channel ducting or a matching female fitting, keeping the installation quick and the external profile flush and low.
UV-Stable Polypropylene
Moulded in polypropylene chosen for its resistance to UV degradation and weathering, so the colour and structural integrity of the grille are built to last through years of external exposure.
Serviceable Front Panel
The louvre front can be unclipped from the rear spigot plate with a flat-head screwdriver, allowing insect mesh to be fitted behind the louvres or the grille to be cleaned out without removing it from the wall.
Lightweight, Low-Profile Design
At just 0.1 kg, the grille adds negligible load to the ducting run while keeping the external wall termination compact and unobtrusive.
Matched Colour Range
Available in White, Beige, Brown, and Terracotta to RAL-matched finishes, allowing the grille to be colour-coordinated with brickwork, render, or existing Verplas ducting accessories on the same property.
Data Conflict: Free Area Figures
Two independent sources report different free area figures for this grille. Verplas's own published technical performance brochure lists the VKC233 Rectangular Louvred Grille at a free area of 2,600mm², with static pressure drops of 15.00 Pa, 48.10 Pa, and 186.90 Pa at 15, 30, and 60 l/s respectively. A UK distributor listing separately states a free area of 5,800mm² — a figure which matches the free area published for the related VKC232 Cowl with Non-Return Flap rather than the VKC233 louvred grille itself. Verplas's own published brochure figures are treated as authoritative here; installers with airflow-critical designs should confirm current performance data directly with Verplas before specifying.
Technical Specification
| Product Identity |
| Manufacturer |
Verplas |
| Product Code (SKU) |
VKC233 |
| Product Name |
110x54mm Louvred Grille |
| System |
System 100 (110 x 54mm rectangular) |
| Dimensions & Construction |
| Grille / Spigot Size |
110 x 54mm |
| Material |
Polypropylene |
| Weight |
0.1 kg |
| Connection Type |
Male spigot (rear-fitting) |
| Grille Style |
Fixed louvre, non-adjustable |
| Airflow Performance (Verplas published brochure) |
| Free Area |
2,600mm² |
| Static Pressure Drop @ 15 l/s |
15.00 Pa |
| Static Pressure Drop @ 30 l/s |
48.10 Pa |
| Static Pressure Drop @ 60 l/s |
186.90 Pa |
Colour Variants
| Colour |
RAL Reference |
SKU |
| White |
RAL 9003 |
VKC233 |
| Beige |
RAL 1001 |
VKC233 |
| Brown |
RAL 8017 |
VKC233 |
| Terracotta |
RAL 2001 |
VKC233 |
Colour Ordering Note
All four colours share the same SKU (VKC233) on the manufacturer's own site, with colour selected at point of order — this is not a flyscreen variant (that is the separate VKC233F/S product). Not all Verplas products are available across the full colour range; the four finishes listed here are confirmed available for this specific grille.
Frequently Asked Questions
What ducting does the 110x54mm Louvred Grille fit?
It fits Verplas's System 100 rectangular flat channel ducting, connecting via its rear 110 x 54mm male spigot. It's commonly paired with wall plates, bends, and airbrick adaptors from the same 110 x 54mm range.
Can the louvres be turned 90° for a vertically-entering duct?
This is not recommended. The louvre blades are angled specifically to shed rainwater when mounted horizontally; rotating the grille 90° can restrict airflow and compromise weather resistance.
Can I fit an insect mesh behind the louvres?
Yes. The front louvre panel unclips from the rear spigot plate using a flat-head screwdriver, giving access to fit mesh or clean the grille without removing the whole unit from the wall.
Is this grille suitable for both intake and extract?
Yes — as a fixed, always-open louvre with no shutter mechanism, it is suitable for either supply (intake) or extract ventilation applications.
Which colours are available for the VKC233?
White (RAL 9003), Beige (RAL 1001), Brown (RAL 8017), and Terracotta (RAL 2001). Not all Verplas grilles are offered across the full colour range, but this particular model is confirmed in all four.
