The Verplas 150mm Louvred Grille With Flyscreen (VKC275F/S) is a fixed external wall terminal for Verplas's round System 150 ducting, combining weather-resistant louvre blades with a built-in insect flyscreen behind the front face. Moulded in tough, UV-stabilised polypropylene, it fits directly onto the rear 150mm round male spigot, giving a neat, low-profile external finish for extract or intake ventilation runs.
The angled louvre blades shed driving rain while remaining permanently open, so there's no shutter mechanism to commission, adjust, or maintain. The integrated flyscreen sits behind the louvres to keep insects out of the ductwork, and the front panel separates from the rear spigot plate for cleaning or mesh replacement. This listing covers all five standard finishes — White, Beige, Brown, Terracotta, and Black — sharing identical dimensions and performance.
Key Features
Weather-Resistant Louvres
The angled blade profile deflects 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. Blades should be installed pointing downwards for optimal weather performance.
Integrated Insect Flyscreen
A fitted mesh flyscreen sits directly behind the louvre face, stopping insects and debris entering the ductwork while adding minimal restriction to the grille's published free area.
Direct Round Male Spigot Fit
The rear 150mm male spigot pushes straight into Verplas System 150 round rigid ducting, telescopic pipe, or flexible hose, keeping the installation quick and the external profile flush.
UV-Stable Polypropylene
Moulded in polypropylene chosen for its resistance to UV degradation and weathering, rated for continuous use between -15°C and +60°C.
Serviceable Front Panel
The louvre front can be separated from the rear spigot plate, allowing the flyscreen mesh to be cleared of lint and debris, or replaced, without removing the grille from the wall.
Matched Colour Range
Available in White, Beige, Brown, Terracotta, and Black RAL-matched finishes, allowing the grille to be colour-coordinated with brickwork, render, or existing Verplas ducting accessories.
Free Area Confirmed
The minimum free area of 11,440mm² for this grille is independently confirmed by two UK distributors (Electrical Wholesaler Ireland and Lacanche). One of these sources also notes this free area figure is the same with or without the fitted flyscreen. Installers with airflow-critical designs should still confirm current performance data directly with Verplas before specifying.
Technical Specification
| Product Identity |
| Manufacturer |
Verplas |
| Product Code (SKU) |
VKC275F/S |
| Product Name |
150mm Louvred Grille With Flyscreen |
| System |
System 150 (150mm round) |
| Dimensions & Construction |
| Spigot Size |
150mm round |
| Overall Face Dimensions |
Approx. 183-185mm x 183-185mm (see conflict note below) |
| Material |
Polypropylene |
| Weight |
0.17 kg |
| Connection Type |
Male spigot (rear-fitting) |
| Grille Style |
Fixed louvre with integrated flyscreen, non-adjustable |
| Operating Temperature Range |
-15°C to +60°C |
| Airflow Performance |
| Minimum Free Area |
11,440mm² |
Data Conflict: Overall Dimensions
Two independent distributors quote slightly different overall face-plate dimensions for this grille: 185 x 185 x 55mm (H x W x D) per one source, versus 183 x 183 x 50.5mm per another. Neither figure is confirmed directly against a Verplas manufacturer datasheet, as the official VKC275F/S data sheet PDF is an image-only scan with no extractable dimension text. Treat both figures as approximate until confirmed against the physical product or a manufacturer drawing.
Colour Variants
| Colour |
RAL Reference |
SKU |
| White |
RAL 9003 |
VKC275F/S |
| Beige |
RAL 1001 |
VKC275F/S |
| Brown |
RAL 8017 |
VKC275F/S |
| Terracotta |
RAL 2001 |
VKC275F/S |
| Black |
N/A |
VKC275F/S |
Colour Ordering Note
All five colours share the same base SKU (VKC275F/S) on the manufacturer's own site, with colour selected at point of order. This is the flyscreen version of the grille — the equivalent product without a flyscreen is listed separately as VKC275. Not all Verplas products are available across the full colour range; the five finishes listed here are confirmed available for this specific grille, including Black, which has no RAL equivalent code.
Frequently Asked Questions
What ducting does this grille fit?
It fits Verplas's System 150 round ducting — rigid pipe, telescopic pipe, or flexible hose — via its rear 150mm male spigot.
Which way up should the grille be installed?
The louvre blades should point downwards. This orientation gives the best resistance to wind-driven rain entering the duct.
Does the flyscreen reduce the free area compared to the plain grille?
According to distributor data, the free area of 11,440mm² is the same with or without the flyscreen fitted, so airflow performance is not compromised by the added insect protection.
Can the flyscreen be cleaned or replaced?
Yes. The front louvre panel separates from the rear spigot plate, giving access to clear the mesh of lint and debris or fit a replacement screen.
What temperature range is this grille rated for?
It's rated for continuous external use between -15°C and +60°C, suitable for exposure across the full range of UK outdoor conditions.
Which colours are available for the VKC275F/S?
White (RAL 9003), Beige (RAL 1001), Brown (RAL 8017), Terracotta (RAL 2001), and Black. Not all Verplas grilles are offered across the full colour range, but this particular model is confirmed in all five.
