PassiNV: Zero-Energy Passive Ventilation
PassiNV delivers continuous fresh air and extracts stale air through separate, sealed channels – powered entirely by natural wind and thermal forces. No electricity. No ductwork. No maintenance.
How PassiNV Works
PassiNV shares the same dual-channel architecture as PassiHEAT but omits the heat exchanger – delivering maximum airflow where thermal recovery is not a requirement.
At the heart of PassiNV is a dual-channel design with strictly separated airflow paths. One channel handles the continuous supply of fresh outdoor air into the building. The other handles the continuous exhaust of stale, polluted indoor air to the outside.
Because the two streams are physically separated throughout, there is no risk of cross-contamination or short-circuiting – stale exhaust air cannot re-enter the building through the inlet.
Without a heat exchanger in the airflow path, PassiNV offers lower resistance and higher volumetric flow rates than PassiHEAT. This makes it the preferred choice in environments that require robust air changes – such as warehouses, industrial units, and plant rooms – where incoming air temperature is less critical than throughput volume.
The entire system is driven by wind pressure and thermal buoyancy. No electricity. No fans. No mechanical parts to service or replace.
Fresh outdoor air is drawn continuously into the building through a dedicated inlet channel. The geometry of the unit accelerates airflow under low-wind conditions, ensuring effective ventilation even in sheltered locations.
Built for high-demand environments
PassiNV is optimised for applications where continuous, high-volume air exchange is the primary requirement — with zero energy input and zero ongoing cost.
High
Volumetric Airflow
With no heat exchanger restricting the flow path, PassiNV delivers higher volumetric airflow rates than PassiHEAT — ideal for large spaces with high air-change requirements.
Zero
Running Cost
No fans, motors, or electrical controls means zero operational energy consumption and no utility cost — indefinitely. PassiNV pays back its installation cost through energy savings alone.
100%
Separation Assured
The dual-channel design guarantees complete separation of supply and exhaust air — preventing re-circulation of contaminants, humidity, or process emissions back into the workspace.
Designed for spaces that need air, not heat
PassiNV is the right choice when high ventilation rates matter more than heat recovery — in industrial, commercial, and specialist non-domestic environments.
Warehouses & Distribution Centres
Large floor areas with high occupancy and loading activities generate significant heat and CO₂. PassiNV delivers the air-change rates needed without fan energy costs or noise.
