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  5. Ventilation and Exhaust
  6. Special Discussion: "Humidity and Condensation Measures in Attics. The Importance of Ventilation."

Special Discussion: "Humidity and Condensation Measures in Attics. The Importance of Ventilation."

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last updated:Jul 30, 2025

セイホープロダクツ 業務本部
セイホープロダクツ 業務本部
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The future of wind and housing! A discussion on the current state of attics in Japanese homes.

In this discussion, we explain the measures against humidity and condensation in attics, as well as the importance of ventilation. Our company launched the underfloor ventilation system in 1981, and two years later, we introduced the attic ventilation system. Since then, after several model changes, it has now become a standard specification for new constructions in some cases. However, through many years of promotional activities, there is an impression that attic ventilation is perceived by both businesses and end users solely as a measure against heat. *For detailed content of the discussion, you can view the PDF materials or related links. Please feel free to contact us for more information.*

    Ventilation and Exhaust
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Special Discussion: "Humidity and Condensation Measures in Attics. The Importance of Ventilation."

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  • Related Link - https://www.seiho-sdk.co.jp/topics/2037/

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Special Discussion: "Measures Against Humidity and Condensation in Attics. The Importance of Ventilation."

Special Discussion: "Measures Against Humidity and Condensation in Attics. The Importance of Ventilation."

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How does the temperature change with mechanical ventilation in the shed? [Kazenosuke Blower 24 / Kazenosuke Unit]

How does the temperature change with mechanical ventilation in the shed? [Kazenosuke Blower 24 / Kazenosuke Unit]

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"Wind Noh Series" for heat prevention in the shed.

"Wind Noh Series" for heat prevention in the shed.

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"Wind Noh Series" for heat prevention in the shed.

"Wind Noh Series" for heat prevention in the shed.

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It is urgent to address the heat issues in the shed!

It is urgent to address the heat issues in the shed!

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In an era of material shortages and rising costs, what should we prioritize and protect? The spaces beneath the floor and in the attic... the "invisible spaces" are being reevaluated now.

In an era of material shortages and rising costs, what should we prioritize and protect? The spaces beneath the floor and in the attic... the "invisible spaces" are being reevaluated now.

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"During the era of material shortages and rising material costs, what should we prioritize and protect?" Published! [Newsletter] Vol. 52

"During the era of material shortages and rising material costs, what should we prioritize and protect?" Published! [Newsletter] Vol. 52

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Under the floor and in the attic... the "invisible spaces" are being re-evaluated now.

In an era of material shortages and rising material costs, what should we prioritize and protect?

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Under the floor and in the attic... "Invisible spaces" are being reconsidered now The environment surrounding the housing industry has changed significantly in recent years. Rising lumber prices, increases in equipment costs, a shortage of skilled workers, and prolonged delivery times are all contributing factors. These changes are not temporary; they are becoming established as structural changes within the entire housing industry. Furthermore, in recent years, the global surge in resource prices, the depreciation of the yen, and rising logistics costs have compounded the situation, leading to an overall instability in housing-related materials. The environment where it was once taken for granted that "necessary materials would be readily available when needed" is no longer a certainty. Additionally, the construction and equipment industries continue to face a serious labor shortage. In particular, the aging of veteran craftsmen who support the field is progressing year by year, while securing young talent is not easy. As a result, situations such as difficulty in scheduling construction dates, longer waiting periods before construction, and limited availability of contractors in certain regions are increasingly common nationwide. In the housing industry, there is now a growing sentiment that "construction plans cannot be made with the same sense as before," whether for new builds or renovations. For more details, please be sure to read the 【related materials】【related links】 below. ↓ ↓ ↓

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Remote live inspection service

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■Live Inspection Start Our company conducts inspections to provide our clients with a deeper understanding of the effectiveness, safety, and installation information of the products they sell. This includes visits to our simulation studio, experimental laboratory, test house, and production line. By observing the visualization of product effects, safety tests, and durability testing scenes, we have received feedback such as "I gained a deeper knowledge of the products" and "I can confidently propose to end users." We are pleased to announce the launch of our 'Remote Live Inspection Service,' focusing on smoke simulation and security systems, which are the main features of our inspections. Considering feedback such as "I am interested, but it's difficult to come all the way to Fukuoka" and "It's hard to coordinate schedules for multiple people," the content will be a condensed version, but we will ensure interactive communication similar to an in-person visit. 【Flow of Remote Inspection】 ■ For underfloor ventilation... Approximately 30 minutes ■ For security... Approximately 20 minutes ■ Q&A... About 10 minutes

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Addressing the heat issues in the shed is a matter of urgency!

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The heat indoors may be caused by "heat trapped in the attic." In the summers of 2024 and 2025, extreme heat is expected to exceed 35°C on consecutive days, becoming the norm. Even with air conditioning running at full capacity, are you experiencing issues like "the second floor is unusually hot" or "the room temperature doesn't drop at night"? One of the causes of this is the heat trapped in the attic. When direct sunlight hits the roof, the temperature in the attic can reach nearly 70°C, compared to an outside temperature of 35°C. This heat radiates into the living space, raising indoor temperatures, reducing the efficiency of air conditioning, and potentially leading to increased electricity bills and negative health effects. ■ Start now! Efficient heat countermeasures with "attic ventilation" ■ Now is the perfect opportunity to install it ahead of the summer peak ■ Attic ventilation is not just for summer * The attic ventilation system by Kazenosuke24 is effective not only for summer heat measures but also for winter condensation prevention. Please take a moment to read the [related materials] and [related links]. ↓ ↓ ↓

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セイホープロダクツ

セイホープロダクツ 業務本部

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In the 21st century, the way human society exists on a global scale is being questioned. In this era of rapid change, what kind of aspirations should we have when engaging in business? SEIHO's new concept naturally arose from such inquiries. "Compassion" is the new concept. Rather than pursuing extravagant ideas, we want to delve deeper into a common concept that everyone can be confident in. To realize this concept, we wish to return to our origins once again. In a time when a diverse array of information is overflowing, if we misinterpret the clear distinction between "purpose" and "means," even effective technology can become futile. SEIHO will firmly place "principles, fundamentals, and roots" as the axis of our management decisions, learning from the wisdom of past sages while creating genuine technologies and services that benefit society.

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