Energy Recovery Ventilator For Passive House
Product Introduction
The Paulair Five-Constant All-Air system integrates multiple functions, including heating, cooling, purification, dehumidification, humidification, sterilization, total heat recovery, and bypass operation for transitional seasons.
Outdoor air undergoes a three-stage filtration process for dust removal and precise temperature and humidity treatment, effectively blocking pollen, smog, and other particulate pollutants. This provides a protective barrier against allergens, especially for individuals with sensitivities.
With a heat recovery efficiency of over 75%, the system operates with high energy efficiency.
It can also be equipped with the exclusive NANOE technology to prevent indoor air from becoming dry, ensuring a consistently comfortable indoor environment throughout all seasons.
Product Type
Five Constant Features
Constant Temperature & Pure Cleanliness
Quiet and Comfortable, creating an indoor space as serene as a forest.
Fresh Air Filtration Efficiency up to 99%
Effectively removes over 99% of PM2.5 and TVOC. Ultraviolet sterilization reaches up to 99%, while activated carbon and negative ions eliminate odors—returning a clean, pollution-free environment to your home.
Purified Air & Whole-Room Ventilation
The entire house’s air is replaced 1.5 times per hour, achieving true air circulation. No need to open windows to breathe clean air—stay indoors and enjoy every breath of fresh, purified air.
Constant Temperature
Even temperature distribution delivers spring-like comfort all year round.
Comfort temperature maintained at 20–26°C
The temperature stays consistently around 24±℃ in summer and 20±℃ in winter, avoiding the discomfort caused by sudden hot or cold fluctuations.
Radiant tubes provide continuous and even temperature adjustment
Radiant heating and cooling ensure uniform temperature with minimal variation, offering comfortable warmth at the feet and coolness overhead
Constant Humidity
Bid farewell to dryness and dampness, and enjoy comfort that feels as natural as the outdoors.
Humidity range: 35%–65%
Indoor humidity is consistently maintained between 35% and 65%, the range most comfortable for the human body.
A dry and pleasant environment
The space remains free from mold, mustiness, and excessive dryness, effectively reducing health issues caused by both humidity and arid conditions.
Constant Oxygen 0₂
Close to nature, regularly refreshing indoor air
CO₂ < 400 PPM
Efficiently purifies secondhand smoke and filters formaldehyde
24/7 efficient purification and filtration
Whole-house air is replaced 1.5 times per hour, achieving true air circulation without the need to open windows. Breathe clean, fresh air indoors—every breath pure and revitalizing.
Constant Quietness
Serene and soothing, creating an indoor space as tranquil as a forest.
Zero indoor units, zero noise.
No equipment is installed inside the room, eliminating any bothersome noise and ensuring a full night's restful sleep.
Uniform indoor temperature with no draft sensation
Using low-temperature-difference radiant heat exchange, the indoor temperature is balanced within the range ideal for human comfort.
The temperature is even, without direct cold drafts or strong stimulation—no noise, just natural and pleasant comfort.
Five-Constant System · Fresh Air Exchange
Temperature Control
Ensures supply air temperature is 2–3℃ lower than indoor temperature, balancing indoor temperature differences, reducing load on the main unit, and lowering operating electricity costs.
Full Fresh Air Exchange
Up to one complete house air change per hour. Supply and exhaust air follow completely independent paths to avoid cross-contamination.
High-Efficiency Dehumidification
Fresh air temperature and humidity are treated separately, making dehumidification and humidification more comfortable. Maximum dehumidification capacity in summer can reach 40%.
Steam Humidification
Humidification is efficient and stable, with maximum humidification capacity in winter up to 60%. High-temperature sterilization ensures no contamination.
Indoor Slight Positive Pressure
Exhaust air volume is about 80% of fresh air volume, creating a slight positive pressure indoors. Fresh air pushes out stale heated air, achieving displacement ventilation while preventing outdoor polluted air from flowing back inside.
High-Efficiency Filtration
Effectively filters PM2.5, aerosols, and other particles with filter efficiency exceeding 99%, keeping indoor air clean and reducing household cleaning burden.
Complete Fresh Air Displacement
Independent air inlets introduce fresh air, which is then effectively directed to push stale indoor air out through kitchens and bathrooms. The supply and exhaust paths are entirely separate—without cross-contamination or air mixing—for a healthier environment.
Five-Constant System · Fresh Air Displacement
High-Efficiency Dehumidification
Fresh air temperature and humidity are treated separately, enabling more comfortable dehumidification and humidification. Maximum dehumidification capacity in summer can reach 40%.
Steam Humidification
The humidification method is efficient and stable, with a maximum humidification capacity in winter of up to 60%. It employs high-temperature sterilization without causing pollution
Advantages of the Five-Constant System
Five-Constant System VS Traditional Air Conditioning
Temperature
Five-Constant System: Summer: 24–28°C, Winter: 18–22°C, temperature difference < 3°C; uniform temperature, comfortable body feel, less prone to illness.
Traditional Air Conditioning: Uneven cooling/heating, large temperature fluctuations; uncomfortable, prone to "air conditioning sickness."
Airflow Sensation
Five-Constant System: Cooling/heating via radiation; no draft sensation, high comfort.
Traditional Air Conditioning: Cold air feels harsh, hot air is dry; draft discomfort, likely to cause "air conditioning sickness."
Humidity
Five-Constant System: Relative humidity 30%–70%, temperature and humidity can be controlled independently; comfortable feel, protects furniture.
Traditional Air Conditioning: No humidity standard, only cools/dehumidifies, no humidification; prone to mold, bacteria growth, and related conditions like rheumatism/arthritis.
Oxygen Level
Five-Constant System: Full-house air replacement once per hour; ensures healthy breathing for the family.
Traditional Air Conditioning: No such function, poor air circulation; may lead to respiratory illnesses.
Air Cleanliness
Five-Constant System: PM2.5 < 50, filters formaldehyde, benzene, TVOC; provides clean air, promotes health.
Traditional Air Conditioning: No air filtration; increases exposure to air pollution and related health risks.
Noise
Five-Constant System: Operates silently; creates a quiet environment, ensures good sleep.
Traditional Air Conditioning: Fan noise around 45 dB; disturbs rest, affects health.
Energy Efficiency
Five-Constant System: Saves 30%–50% energy; reduces annual heating gas costs.
Traditional Air Conditioning: Standard energy consumption.
Smart Features
Five-Constant System: Intelligent system, remote control, real-time monitoring, easy to use.
Traditional Air Conditioning: Lacks smart functionality.
Installation (Terminal)
Five-Constant System: Ceiling height about 10 cm; saves space.
Traditional Air Conditioning: Ceiling height about 30 cm; occupies more space.
Advantages
Five-Constant System Dehumidification and Dryness Relief – Warm, Moist, and Comfortable
Medical-grade filter with triple-stage filtration and strong sterilization + UV disinfection, removing over 99% of PM2.5 and dust particles from the air, continuously delivering fresh air indoors.
Fresh Air Displacement – Clean Oxygen, Fresh and Invigorating
24-hour complete air replacement – no stale air indoors, quickly expelling indoor pollutants.
