换气小常识

Why do We Need Good Air Ventilation?

In order to ensure healthy indoor air quality proper ventilation is required.
Constant ventilation introducing fresh outdoor air and
exhausting poor air will help reduce and eliminate inside air pollutants,
expel humidity and unpleasant odors.

 

Just Open the Window --- Not so Fast!

Keeping the windows closed for a long periods of time
allows indoor air pollution to flourish and prevents clean air from naturally clearing the room.
Reports indicate that the average person spends about 93% of their time indoors.
The benefits of clean indoor air quality will directly improve work efficiency and support good health.

 

The Safety Standard for Air Quality

ITEM STANDARD UNIT
CO2 8hr value 1000 ppm
CO 8hr value 9 ppm
HCHO 1 hour 0.08 ppm
TVOC 1hr value 0.56 ppm
Bacteria Highest value 1500 CFU/m3
Fungi Highest value
1000
(excluding the outdoor and indoor of fungal concentration is less than or equal to 1.3)
CFU/m3
PM10 24hr value 75 μg/m3
PM2.5 24hr value 35 μg/m3
O3 8hr value 0.06 ppm

Source: EPA, Executive Yuan (2012)

※ 1hr value: refers to an arithmetic mean of each value in 1 hour or the value accumulated and sampled in 1 hour.

※ 8hr value: refers to an arithmetic mean of each value in 8 hours straight or the value accumulated and sampled in 8 hours.

※ 24hr value: refers to an arithmetic mean of each value in 24 hours straight or the value accumulated and sampled in 8 hours.

※ Highest value: a value sampled and analyzed by the required method.

Outdoor Air VS. Indoor Air

When you protect your mouth and nose outdoors from the poor air,
you may not know that actually, the air you are breathing indoors is not any better than outdoors.
The US EPA conducted the BASE study,
a five-year study that found many residential and commercial buildings have extremely high air pollution inside,
often 10 times worse than outdoors. Indoor air pollution may be more harmful than people think.
Even without opening the door and windows,
PM2.5 can still sneak into your home through gaps in the doors, windows and vents in the building.
When outdoor PM2.5 is blown away naturally by the wind improving air quality,
indoor PM2.5 may remain higher due to closed doors and windows. 
※ Overview of the Building Assessment Survey and Evaluation Study. EPA. Web. January 25, 2017.

What is PM2.5?

Particles less than or equal to 10 micrometers in diameter are so small that they can get into the lungs,
potentially causing serious health problems.
Ten micrometers is less than the width of a single human hair.
Coarse dust particles (PM10) are 2.5 to 10 micrometers in diameter.
“Website Article.” Particle Pollution (PM) AirNow. August 31, 2016. Web. January 23, 2017

The Dangers of PM2.5?

Although very small, PM2.5’s effects on the human body should not be underestimated. A pollution source smaller than 10 μm, which cannot be seen by the naked eye, may be an invisible killer to human health. As it enters the human body through our respiratory system and reaches the pulmonary alveolus, it may cause cardiopulmonary disease, brain stroke, respiratory disease, etc. Scientific research also reports that fine particulate matter may be a source for causing adenocarcinoma.

 

Sources of Indoor Air Pollution?

According to the EPA, our indoor environment is two to five times more toxic than our outdoor environment,
and in some cases, the air measurements indoors have been found to be 100 times more polluted.
The World Health Organization (WHO) agrees,
reporting that almost 3% of the global burden of disease is due to indoor air pollution.
80% of all cancers are attributed to environmental rather than genetic factors,
including exposure to carcinogenic chemicals, many of which are found in household cleaning products.

 

How to calculate the demand for air exchange rate?

The Air we breath mainly consists of nitrogen (78.09%), oxygen (20.95%), argon (0.93%) and carbon dioxide (0.03%).
Taking in air with excessive or inadequate oxygen content may make the body feel uncomfortable and become unhealthy.
The air exchange rate needed for a person is 20 m3/h.
The number of people in the space and the size of the space are two factors for choosing an air exchange rate.

 
SUGGESTED AIR EXCHANGE PER HOUR
Location RESTAURANT OFFICE HOME
Space type Banquet Hall Kitchen Restaurant Toilet Showroom Conference Room Office Toilet Bedroom, Living, Bathroom Kitchen
Air exchange per hour 10 20 6 8 10 12 6 8 6 15
 
SUGGESTED AIR EXCHANGE PER HOUR
Location HOSPITAL SCHOOL OFFICE
Space type Waiting Room Consulting Room, Ward Operation Room Sterilization Room Classroom, Assembly Hall Stadium OP room Server Room, Coating Room
Air exchange per hour 10 6 15 12 6 8 6 20
 

Suppose the bathroom in your home is 4m2 in floor space and 2.5m in height.
The Air Exchange per hour formula is: Floor space (4 m2) × Height (2.5m) × Suggested air exchange = 60 m3/h
Based on this result, the space must choose an air exchange rate of over 60 m3/h

The Influence of Poor Indoor Air Quality on the Human Body?

Studies suggest that poor IAQ relates to disease in the human body.
When the CO2 concentration in the air exceeds 1000ppm, you begin to feel low-spirited and tired.
Nobel Prize winner Dr. Otto Heinrich Warburg hypothesized that cancer is mainly caused by insufficient oxygen supply in the human body.
A reasonable air oxygen content in indoor air should be kept at 21%, or 18% - the minimum level acceptable to the human body.
Any percentage below this will have an impact on the human body.
TUMÄ’s Flow2 One will quickly and effectively lower the indoor CO2 concentration and maintain indoor air quality.

Simple Ways to Improve IAQ

According to the EPA, when outdoor pollutants are too high,
people should avoid outdoor activity and close doors and windows instead.
However, the presence of indoor PM2.5 is often ignored.
When the concentration of indoor air pollutants is too high and cannot be completely exhausted to the outside,
what should you do?

KEEP WINDOWS
OPEN

But keep in mind todays high concentration of outdoor PM2.5 is becoming increasingly serious. Opening windows will allow outdoor air to get in..

PLACE POTTED PLANTS INDOORS

A pleasant looking environment is a healthy environment. House plants reduce indoor air pollution concentrations, such as particulate matter, CO2 and dangerous formaldehyde.

USE AIR EXCHANGE EQUIPMENT

Provides fresh outdoor air, eliminates indoor pollution, and exhausts humidity and odor. This will ensure good indoor air quality and will make your home healthier.

Improve Ventilation in the Basement

Basements often have no windows for ventilation and proper air exchange.
Over time, this leads to damp humid air which causes damage.
Installing the TUMÄ Eco DC Brushless Ventilation Fan will effectively eliminate moisture and maintain good indoor air.