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All of our Lossnay and RenewAire energy recovery ventilators are designed using the patented Mitsubishi Lossnay Core.

This advanced technology provides a large number of benefits including:

For detailed information on the Lossnay Core, visit our How It Works section.

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During the planning and construction of a new home or building, one of the most basic needs – fresh air – is not getting the attention it deserves.

The fact is that many of the same building technologies which promise to make your indoor environment more comfortable and energy efficient may actually trap dangerous indoor pollutants, moisture and odours inside the home.

Household and commercial chemical vapours, radon and even carbon monoxide will accumulate more quickly inside newer tighter construction and may even lead to "Sick Building Syndrome".

Likewise, odour and moisture from bathrooms, cooking, pets and other common sources can quickly become nightmares.

Our Energy Recovery Ventilators provide fresh air circulation to help keep your family or employees healthy while also fighting mold, dry rot and other damage related to excess moisture buildup.

In addition to the health and safety benefits, our products provide superior energy savings all year 'round! Visit our How It Works section to see how we achieve both.

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In many rotary wheel and conventional type ERVs, condensation can easily accumulate within the unit during normal Canadian winter conditions. As a result, they must use a defrost mechanism to block the cold fresh air with a damper and recirculate the exhaust air in order to defrost the core. During this process, fresh air cannot be circulated into the building.

Since Lossnay has little or no condensation, a defrost mechanism is not required. This allows Lossnay to provide optimum air quality at all times.

When the outdoor temperature drops below -10°C, many heat exchange ventilators will be in frequent defrost mode which dramatically reduces the amount of fresh air which can enter the building.

Lossnay uses the proactive approach that prevents frost from occurring in these more extreme conditions. Since Lossnay transfers both sensible and latent heat between fresh and exhaust air, the dew point temperature of the air is suppressed, which means more energy needs to be removed from the water vapour in the air in order to form condensation. When the outdoor temperature drops below -10°C, the Supply Air fan in the Lossnay unit will begin intermittent operation, allowing the warm exhaust air to keep water vapour in the core from condensing, and having constant exhaust ventilation rate while maintaining separation in the airstreams.

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The Lossnay core is designed to have laminar flow in the air passages. This prevents dust particles from building up on the core’s surface.

Moreover, before entering the Lossnay core, air passes thru an air filter which removes most of the large dust particles in the air. Therefore, it is only at the entry point of the core where a slight amount of dust may accumulate due to the incident turbulent flow, which can be easily removed during simple annual maintenance.

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The Lossnay Core is a Cross-Flow Static-Plate Heat Exchanger in which no moving parts are used. Such design and technology maximize heat transfer efficiency, providing easy and low maintenance, longer service life, and with no moving parts, there are no break downs.

While wheel-based systems use Counter Flow Rotary Technology, in which both fresh and exhaust air flow in opposite parallel directions, with the wheel rotating to carry heat and humidity across from one source to the other.

Due to the rotational movement of the wheels, a large amount of gas leakage takes place from the exhaust side to the supply side and results in a high rate of cross-contamination. Also, because of the wheel movement, turbulent air flows through these rotary cores which causes dust to get clogged up in the passages. If left unattended, this problem could result in the need to replace the rotary core. In addition, the rotary wheel relies on the motor and belt drive for the movement, which results in higher maintenance needs and is more prone to breakdown and replacement.


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Due to the large amount of gas leakage in wheels, purge air is required to reject the exhaust air from entering the supply air passage. As the fresh air demand increases, air flow rate increases, and the amount of gas leakage increases. Therefore, more purge air is needed to block the air leakage, and as a result the volume of the supplied fresh air decreases. The net outcome from this cycle is high operating cost with low efficiency.

Since Lossnay is a static core, there is no gas leakage. Therefore, no purge air is needed, maximizing efficiency with the minimal operating cost.

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Lossnay uses small diameter air ducts which fit into the limited space of the plenum perfectly, thus reducing material costs.

When installed with City Multi, two non-polar communication wires are all that is required to tie Lossnay to City Multi air comfort systems or Building Management Systems (BMS). Easy installation means reduced costs.

Lossnay is the world’s only ERV which is designed to have alternative direction for duct connection. Outdoor ducts can be installed either parallel or perpendicular to indoor ducts, resulting in increased installation flexibility which can result in significant installation savings.

Lossnay is easy to maintain. The surface area of the Lossnay core should be cleaned with a vacuum cleaner once every 2 years. Use a soft brush to remove the dust accumulated on the core surface.

As for the air filter, vacuum it once every year. To remove tough dirt, wash the filter with mild detergent and lukewarm water.