VL250 Vertical Lossnay Fresh Air Heat Recovery Ventilation with Wi-Fi Control

Designed for Flexibility and Convenience

The Vertical Lossnay Range is designed specifically for the New Zealand housing market and makes energy efficient, super-quiet ventilation accessible to even more homes.

Because of the slimline, vertical upright design, the Lossnay Ventilation System is not limited to an in-roof installation. With its small upright footprint it can be placed in the garage or a cupboard in the kitchen. Now whole home ventilation can be installed without compromising the architectural design of the building.

Automatic Free Cooling^* Mode

Using the on-board temperature sensors, the Vertical Lossnay unit automatically enters Bypass Mode when it detects a space is hotter than desired and the outside air is cooler.

To reduce the risk of overheating the home, fresh air is introduced, bypassing the Lossnay Core. This is ideal for cooling down a dwelling that may have overheated during the day once the outside temperature has dropped in the evening.

EA = Exhaust Air, OA = Outside Air, RA = Return Air, SA = Supply Air
*In comparison to using a dedicated cooling device. The unit will continue to use a small amount of power to bring colder fresh air from outside.

Easy to Use Control

A built-in LCD controller allows for easy control and commissioning of the unit. This interface displays all functionality and temperature settings of the system.

Slimline to Fit in a Cupboard

The vertical upright design of the Lossnay Ventilation System is not limited to an in-roof installation. Now whole home ventilation can be integrated into the overall building design without limitations.

Now Standard on the Vertical Lossnay: G4 Filter for Healthier Air

The Vertical Lossnay unit now comes equipped with a G4 filter as standard—delivering advanced, medium-grade filtration to help keep your indoor air clean and healthy. It captures 99.99% of larger particles (up to 10 microns) and around 65% of finer particles as small as 1 micron.

Effectively filters out:

• Pollen
• Mold spores
• Bacteria
• Construction dust
• Some viruses

A built-in solution for fresher air in homes, offices, and any space where air quality counts.

Optional Humidity Sensor – Automated Moisture Control

Add intelligent moisture management to your Lossnay system with the optional humidity sensor. Easily installed on the return air duct and powered by the unit, it automatically adjusts airflow to maintain a comfortable, healthy environment.

Key features:

• Monitors indoor humidity in real time (shown on controller)
• Adjustable RH threshold (50%–90%)
• Increases fan speed when humidity exceeds the set level
• Maintains boosted airflow for 15 minutes, then returns to normal
• Compatible with metal/plastic ducts under 20mm (plate required for flexible/EPP ducts)

A smart choice for controlling condensation, dampness, and air freshness.

Optional CO₂ Sensor - Smarter Air Quality Control

Enhance your Lossnay system with the optional wall-mounted CO₂ sensor, designed to maintain safe, fresh indoor air. Powered directly by the unit, it’s easy to install and automatically adjusts airflow based on CO₂ levels.

Key features:

• Continuously monitors CO₂ (400–2,000 ppm*)
• Automatically boosts ventilation when needed
• Choose from three CO₂ threshold settings
• Connect up to two sensors for broader coverage
• Live CO₂ readings shown on the controller

A smart upgrade for healthier air in homes, schools, offices, and more.

The 4 Functions of the Lossnay Core

The Balanced Pressure Lossnay Heat Recovery Ventilation System removes stale, dirty air and draws in fresh air from outside. Lossnay also recovers heat energy from the air being transferred to pre-warm (or pre-cool) the fresh air being drawn into your home. Lossnay is ideal for small to large sized homes between 52m² and 400m².

1. The stale air extracted from your home is Return Air (RA). Return Air can contain high levels of CO₂, odours and other pollutants. This Return Air stream also contains heat energy that Lossnay can recover, which is not the case with positive pressure ventilation systems.
2. As the stale Return Air is removed, the Lossnay Core ‘recovers’ the useful heat energy from it. The air is then exhausted (EA) outside along with the unwanted pollutants.
3. Outdoor Air (OA) is introduced to provide fresh air. It is first filtered, then passed through the Lossnay Core. This allows it be pre-heated in winter (or pre-cooled in summer) using the energy recovered from the Return Air.
4. Supply Air (SA) then enters your house as fresh pre-heated or pre-cooled air.