The Importance Air Exchange in Buildings
and commercial heat recovery ventilation systems complying with building
regulations as well as providing up to 93% heat recovery and controlling
the condensation levels.
Air Environment in Buildings:
Japan, the "Building Management Law", a law concerning the
sanitary environment in buildings, designates 11 applications including
offices, shops, and schools with a total floor area of 3,000m2 or more,
as buildings. Law maintenance and ventilation, water supply, discharge
management according to the Environmental Sanitation Management
Standards is obligatory.
of Air Contamination in Buildings:
of interior, New ceilings, walls and ornaments will turn yellow from
dust and tobacco smoke tar in 1 to 2 years.
legal standards for ventilation differ according to each country. Please
follow the standards set by your country. In the U.S., ASHRAE revised
their standards in 1989 to become more strict. In Japan, regulations are
set in the "The Building Standard Law of Japan Enforcement
Ordinance", the so-called "Building Management Law" for
securing a sanitary buildings environment. According to the
"Building Standards Law", a minimum of 20 m3/h per occupant of
ventilation air is required.
Comparing of Ventilation Methods:
are two main types of ventilation methods.
Mainly used in large buildings, with the ventilation air intake being
installed in one machine room. For this method, primary treatment of the
ventilation air, such as energy recovery to the intake air and dust
removal, is performed via distribution to the building by ducts.
Zoned Ventilation Method: Mainly
used in small to medium sized buildings, with areas being ventilated
using ventilation air intake via independent ventilation devices. The
use of this method has recently increased as independent control is
becoming more feasible.
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Last updated - 11/02/2020