Q: What size slot do I need to fit the 300mm trickle vent?

A: The 300mm trickle vent fits a 13mm slot (365mm x 13mm) or two 10mm slots (2 x 120mm x 10mm with a 10mm land). Always check your frame measurements before ordering.

Q: Are these trickle vents compatible with uPVC, timber, and aluminium frames?

A: Yes — our 300mm trickle vents are compatible with uPVC, timber, and aluminium frames, making them a versatile ventilation solution for most window types

Q: How quickly will my trickle vents be dispatched?

A: We aim to dispatch same day from our base in Cheltenham, in the heart of the Cotswolds. All orders are sent free via Royal Mail Tracked with no hidden costs.

uPVC Trickle Vents 400mm | Window Ventilation UK

400mm Trickle Vents | RW Simon Framevent FV04

Poor ventilation causes more problems than most people realise — condensation on windows, persistent damp, stale air that never quite clears and odors that given time become the norm. Our 300mm trickle vents and 400mm vents solve all of that quietly and efficiently, sitting on your window or door frame and providing steady background airflow without draughts minimum noise.

When looking for the best trickle vents the RW Simon Framevent FV04 is manufactured in England from UV-stabilised uPVC — tough, weather-resistant, and built to last without fading or discolouration over time. The slim, rounded profile suits uPVC, timber, and aluminium frames equally well, and the integrated flyscreen on the external hood keeps insects out without restricting airflow.

Key Features:

Fully controllable — positive open/close tab.
Unique Design - window air vents for up-draught or down-draught airflow.
Easy to fit — snap-on quick-fit ends with fixing screws included.
Available in grey trickle vents and 11 other colours — including White, Black, Anthracite, Clay Brown, Chartwell Green and more. Our grey trickle vents are particularly popular for contemporary aluminium and uPVC frames.
Tested to BS EN 1026:2016 & BS EN 1027:2016 — weather-tight to 400 Pa.
Made in England — lower carbon footprint, reliable supply.

Specifications:

Length: 400mm.
Slot options: 13mm (365mm x 13mm) or 10mm (2 x 120mm x 10mm with 10mm drill)
Equivalent area: 3,180mm² (13mm) / 3,112mm² (10mm)
Pack sizes: 1, please enquire for larger quantities.
Complies with: Approved Document K 2013, BS7412:2007 & BS EN 14351-1:2006.

Fitting:

Route or drill 10mm or 13mm holes through the frame
Place the unit centrally over the slots
Fix in place using the screws provided

A silicone seal around the frame gives window air vents a weathertight, professional finish.

What's in the Box:

1 x Internal Vent · 1 x External Hood · 4 x End Caps · 4 x Fixing Screws

Free UK Delivery:

Free tracked delivery via Royal Mail Tracked
Same-day despatch from our Cheltenham HQ, in the heart of the Cotswolds.
VAT included — no hidden costs at checkout.

Need a wider option? We also stock the slotvent 300mm for smaller frame requirements — the 400mm trickle vent is ideal where a higher equivalent area is needed especially when installing a kitchen vent or bathroom vent due to increased humidity.

Slotvent 400mm