One idea, applied across the whole building: keep the air moving.
The Active Vent range brings wind-powered cross-ventilation to the places damp starts, from the base of a cavity wall to the window. Silent, with no running costs, and a removable insert that is quick to inspect and clear. Manufactured in Cardiff by an ISO 9001-certified manufacturer. Here is what we make today, and what is coming next.
Three products, one principle
Every product uses the wind to move air where it matters. Choose by where you need to help stop damp taking hold.
Active Weep Vent
The wind-powered weep vent for cavity walls (10 × 65 × 100mm, fitted in a chased-out brick perp joint), with a removable, inspectable insert that is quick to check and clear.
- › At 0mph it works like a standard vent; once the wind picks up, it ventilates the base of the cavity actively
- › Removable insert lets the vent be inspected and cleared of debris
- › Designed to help tackle the blocked-weep-hole and cavity-debris problems BRE identified as causes of damp
Active Trickle Vent
A wind-powered window vent (15mm diameter × 75mm long) fitted through a 16mm hole drilled in the window frame, designed to support Part F background ventilation (equivalent area to be published).
- › Two sections, one from outside and one from inside, click together through the frame
- › We recommend at least 2 per window; price on request
- › Part of a whole-home approach to keeping moist indoor air moving
Brick vents & more
We are extending the same wind-powered airflow across more of the building, with brick vents and further products to follow.
- › In development: not yet available to buy
- › Designed to apply the same wind-powered cross-ventilation principle
- › Register your interest and we will let you know when it launches
Wind-powered, patent pending, nothing to switch on
Conventional ventilation relies on someone leaving a door open, a fan switched on or a vent unblocked. The Active Vent range is designed so the wind does the work.
Wind-powered airflow
Each vent uses the wind to drive air through: silent, non-mechanical and with no running costs. At 0mph it works like a standard vent; once the wind picks up, it ventilates actively. There is nothing to switch on and nothing to remember.
Removable insert
The insert lifts out so the vent can be inspected and cleared, helping tackle the blocked weep holes and debris that can trap water against the inner wall. Inspect periodically; the removable insert makes it quick to check and clear.
Nothing to switch on
Because each unit runs its own inlet-and-exhaust cycle wherever it is fitted, it does not rely on an open door or anyone switching anything on. No other vent we know of runs this two-way, wind-powered cycle from a single unit (patent pending).
Silent, non-mechanical and with no running costs. Damp has several possible sources, such as leaks and plumbing faults, that a vent can't fix, so get those repaired first.
How cross-ventilation helps tackle damp
Where cavity-wall moisture really comes from, how trapped humid air migrates back into your home, and why airflow, not sealing, matters.
Read the science → The researchThe evidence, every claim a real source
The independent research behind Active Vent: English Housing Survey, WHO, UK Building Regulations and the BRE/BEIS cavity-wall study on why walls stay wet.
See the evidence →Ready to let the wind do the work?
Pre-order the Active Weep Vent online, or talk to us about the right vent for your project: cavity, window or a whole property.