We promptly addressed the formaldehyde issue at an early stage and achieved an indoor environment superior to the directive standards issued by the Ministry of Health, Welfare and Labor when the building of Heim was complete, ahead of other companies. In order to protect the health of your family, Heim maintains a clean indoor air environment.
The formaldehyde concentration in a room is determined by the proportion between the amount of formaldehyde emitted from the building material and the air ventilation. Based on the ventilation capacity of a building, the amended Building Standard Law defined the area of building material to be used for the building according to the amount of formaldehyde emitted from the same. However, the interior material used to construct Heim is not restricted by the Law governing the area to be used for a building and has the least amount of formaldehyde shown as a symbol of F 4-star material. This specification represents the highest grade under the Quality Assurance Law.
* Quality Assurance Law: Law on Promotion to Ensure the Quality of Houses
Targeting the further enhancement of indoor air quality, we strive to take measures against volatile organic compounds (VOCs), which are currently not governed by national regulations. These are paint thinner substances, represented by toluene and xylene contained in adhesives. We have developed our own technology to measure VOCs and have determined the amounts of VOCs emitted from building materials, adhesives and decorated boards using this measurement technology. For Heim, we use materials that emit minimal amounts of VOCs.
All materials used in the Heim building site, including small items such as curing tapes and adhesives, are chosen in the factory based on our own standards. No materials are procured on-site to avoid the potential use of materials containing and/or emitting harmful chemicals. In addition, we continue intermittent 24-hour ventilation operation during the building period until delivery.
A ventilator installed under the floor takes in outdoor air, purifies it with an industrial quality filter to remove dust, pollen and NO2, and sends the purified air to several inlets installed on each floor via a duct. The inhaled air circulates within rooms like a boomerang and returns to the exhaust outlet containing dust, ticks and mold, from where it is discharged outdoors. This ventilation system maintains good indoor air quality with 24-hour ventilation all year round. As the fluctuation of power caused by differences in temperature and barometric pressure between outdoors and indoors is minimized, the system is far more efficient than one independently operating inhale and exhale ventilators.
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