What is the MVHR System?

A Mechanical Ventilation with Heat Recovery (MVHR) system is an energy-efficient ventilation solution that provides continuous fresh air while recovering heat (or cooling energy) from exhaust air, reducing energy waste and improving indoor air quality (IAQ) and comfort.

Continuous Ventilation: Expels stale indoor air (containing CO₂, odors, moisture, etc.) and supplies filtered fresh air.

Energy Recovery: Uses a heat exchanger to recover heat (in winter) or cooling energy (in summer) from exhaust air, reducing HVAC energy consumption.

Air Filtration: Filters pollutants like PM2.5, pollen, and dust to enhance IAQ.

Key Applications

MVHR systems are ideal for airtight buildings and excel in the following scenarios:

Residential Buildings

Passive houses / Low-energy homes (minimizes heating/cooling demand)
Airtight apartments (ensures fresh air when natural ventilation is insufficient)
Humid climates (prevents condensation and mold growth)

Commercial & Public Buildings

Offices (improves occupant comfort and reduces "sick building syndrome")
Schools / Hospitals (ensures clean air and reduces infection risks)
Hotels / Restaurants (controls odors and enhances guest experience)

Special Environments

Extreme cold/hot climates (minimizes heat loss or cooling loss)
Highly polluted cities (filters PM2.5 and provides clean air)

Core Components

An MVHR system consists of the following key components:

Component	Function
Heat Exchanger	Core unit, recovers 60%~95% of heat/cooling energy (counter-flow type is most efficient)
Supply & Extract Fans	Dual fans control fresh air intake and exhaust airflow (adjustable speed)
Filters	Remove PM2.5, pollen, and dust (typically includes primary + HEPA filters)
Ductwork	Distributes fresh air to rooms and collects stale air (insulated to prevent condensation)
Control System	Adjusts airflow, humidity, and can integrate with smart home systems (e.g., CO₂ sensors)
Bypass Mode	Allows fresh air intake without heat exchange in summer to avoid overheating