Q&A

1. Why does it call Energy Recovery Ventilator? 

Heat is energy. Thermal energy can be divided into sensible heat and latent heat.

Sensible heat: the amount of heat required to change the temperature of an object (corresponding to temperature)

Latent heat: the amount of heat required to change the state of an object (corresponding to humidity)

Energy = Sensible Heat + Latent Heat

ERV can introduce fresh air from outside while maintaining the indoor temperature and humidity transfer to fresh air, and expel pollutants and harmful substances.
When indoor air and outdoor air pass through the machine, the air will exchange humidity through flow and heat conduction, while water vapor transfers water due to pressure difference, releasing excess humidity and balancing temperature and humidity.

2. Why ERV is needed? 

supply of clean and fresh air Continuously

Provide fresh air while expelling indoor turbid air, reducing indoor carbon dioxide concentration and reducing allergens.

Exchange thermal energy, for energy saving 

When temperature difference occurs, ERV would exchange heat, and make temperature and humidity to be closer to the room's,  which is effectively reducing air conditioning load and saving energy. Using with smart mode, ERV can even automatically adjust according to indoor and outdoor temperatures at any time.

Isolate noise and dust

Ventilation can be achieved without opening windows, isolating noise and dust.

3. Do I need a ERV? 

If you and your family often have the following situations in daily life, you may need an ERV!

  • Windows are closed for a long time

  • Often has noise, dust, polluted air, and odors entering the house

  • Easy to have allergic reactions

  • Indoor carbon dioxide concentration is too high, often appearing weak, drowsy and other conditions

4. What are the principles of ventilators? 

The principles of ventilation equipment are generally divided into three types: positive pressure, negative pressure, and positive-negative pressure combination.

Positive pressure: forcibly introduces fresh air into room, while indoor air can be sent out through windows or door gaps.

Negative pressure: forcibly exhausts indoor air to outdoor, while outdoor air enters the room through windows or door gaps. 

Positive-negative pressure combination:

1. When the efficieny of natural ventilation or single pressure is poor

2. When overall space re-planning or a closed space 

3. When indoor pollution sources are produced, and need to refresh the air (such as cigarette or odors)  

5. Does ventilator produce noise? Does it affect living quality? 

 The noise performance ​​for general household ventilation equipment specifications are all below 40 decibels (except for high-speed ventilation mode), which is actually very quiet compared to general indoor environments.
When choosing ventilation equipment, apart from product durability, noise performance is also a very important indicator.
In addition, whether the exhaust duct is properly installed is also related to noise. If it is not installed properly, it may also produce non-equipment noise.

6. Does ERV occupy space? 

ERV is hidden in the ceiling. Choosing a thin model with machine's thickness of only 23 cm will not waste space. On the contrary, general air purifier occupy more floor space.

7. Does ERV consume eletricity? 

The power consumption of an ERV is similar to an electric fan. After installation, you can enjoy clean and fresh air while saving electricity!

8. How to choose a ERV? 

The calculation is according to the room partition,  number of people and the house space.

The standard per capita of fresh air volume for residential buildings is about 30 m³/h, with ventilation rate of 1-2 times per hour. Assuming the residential area is 50㎡ (around 500 ft.), with a floor height of 2.5 m and 4-people non-smoking family.    

1. according to population and per capita Air volume

Total required fresh air volume = required per capita required fresh air volume X population

Example：Total required fresh air = 30m³/h x 4

                                                                       = 120 m³/h

2. according to ventilation rate  

Total required fresh air volume = residential area X floor height X ventilation rate

Example：Total required fresh air = 50㎡ x 2.5m x 2

                                                                       = 250 m³/h

Choosing the larger amount from the results, that is, the residence needs 250m³ of fresh air per hour.

9. Does it need a filter? 

Air pollution is serious, high-specification filters are particularly important. In addition to the heat exchangr, the machine is already equipped with a primary filter, which is used to filter dust and sand particles; and the advanced filter filters PM2.5 suspended particles.

An activated carbon filter layer can also be added to remove odors.    

10. How often does it take to replace the filter? 

It depends on the levels of air pollution and daily usage time.

The primary filter is recommended to be washed with water every three months. HEPA or activated carbon filters cannot be washed and need to be replaced every 6-12 months. The replacement method is very simple, or you can ask our field colleagues to help.

11. What should I pay attention to? 

The ideal solution is to plan in advance before renovation projects. ERV is hidden in false ceilings, so space must be reserved.
ERV needs to be installed with multiple sets of ventilation ducts. If there are too many beams in the house, it will affect the configuration of ventilation ducts.

The construction process generally takes 3-4 days. To prevent dust from entering the air duct, other renovation works should be avoided during installation.
For the price, it depends on the selected model, air volume, accessory requirements, number of air outlets, material/length of air ducts, construction difficulty, etc.