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  3. セイホープロダクツ 業務本部
  4. Is a floor ventilation fan necessary?
PRODUCT
  • Aug 07, 2025
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Aug 07, 2025

Is a floor ventilation fan necessary?

セイホープロダクツ セイホープロダクツ 業務本部
Some of you may be wondering whether to introduce the effective equipment "underfloor ventilation fan" for pest control under the floor and to prevent the deterioration of the foundation (moisture control). Why is ventilation under the floor necessary? We have created a page that clearly summarizes the effects of forced ventilation and installation. The area of openings required under the floor is specified by the Building Standards Act. In short, this means that you must provide a certain area of ventilation openings for moisture control under the floor. However, when looking at single-family homes, you will find that there are always ventilation openings, whether they are square grilles or full-perimeter ventilation foundation packing methods, although the types may differ. In recent years, homes with foundation insulation methods (especially in northern regions like Hokkaido) have also been built, but in this foundation insulation method, the underfloor is connected to the interior, and the underfloor is considered part of the interior, so there are no ventilation openings under the floor to prioritize insulation effectiveness. The adoption rate of the foundation insulation method is still low, but moisture issues are not nonexistent. I would like to touch on this at another opportunity. Please be sure to read the 【related materials】 and 【related links】. ↓ ↓ ↓
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Is a floor ventilation fan necessary? | Seihou Products Co., Ltd.
Why is ventilation under the floor necessary? I have summarized the effects and installation of forced ventilation in an easy-to-understand manner.
Is your home and family healthy? | Seihou Products for Underfloor and Attic Ventilation
Invisible problems in the crawl space and attic greatly affect the lifespan of a house. This is a site that provides information about ventilation in crawl spaces and attics.

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タービン・ユニット Type Ai無塗装.jpg

Underfloor Ventilation Series "Turbine Unit Type Ai"

Exhaust type + diffusion type unit! A subfloor ventilation series that detects humidity conditions and draws in dry air from beneath the floor.

The system detects the amount of water vapor (absolute humidity) and independently controls the exhaust ventilation system and the diffusion fan. When there is a high amount of water vapor, only the diffusion fan operates, and when it is low, the exhaust ventilation system also operates to bring in dry air from below the floor. POINT 1: Optimal independent operation of exhaust and air supply with absolute humidity sensor POINT 2: Optimal deodorization operation with standard phytoncide POINT 3: Detects abnormalities in the underfloor ventilation fan and water issues, displaying them on the controller. 【Features】 ○ Effective against underfloor humidity, condensation, and mold ○ Powerful exhaust and diffusion For more details, please contact us or download the catalog.

  • Ventilation and Exhaust

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タービン・ユニット Type Bi無塗装.jpg

Underfloor Ventilation Series "Turbine Unit Type Bi"

Exhaust type + stirring type unit type

It detects the amount of water vapor (absolute humidity) and independently controls the exhaust ventilation system and the mixing fan. When there is a lot of water vapor, only the mixing fan operates, and when there is less, the exhaust ventilation system operates as well, bringing in dry air from below the floor. POINT 1: Optimal independent operation of exhaust and air blowing with absolute humidity sensors POINT 2: Optimal deodorization operation with standard phytoncide POINT 3: Detects abnormalities in the underfloor ventilation fan and water issues, displaying them on the controller. 【Features】 ○ Effective against underfloor humidity, condensation, and mold ○ Powerful exhaust and mixing For more details, please contact us or download the catalog.

  • Ventilation and Exhaust

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風太郎ユニット(かくはんマイナーチェンジ).jpg

Underfloor ventilation "Kazetaro"

A comfortable indoor environment! Prevents condensation and extends the lifespan of the building.

The underfloor ventilation "Kazetaro" maintains a comfortable condition for wood by forcibly introducing air into the underfloor space. It is particularly effective in eliminating condensation. Underfloor ventilation also affects the indoor environment, reducing the conditions for the growth of dust mites and mold, which benefits the health of the family. The Kazetaro unit uses a hybrid sensor to detect the amount of water vapor (humidity) in the outside air, and the hybrid controller independently controls the Kazetaro blower type and Kazetaro mixer type, creating optimal ventilation operation for the wood under the floor. 【Features】 ○ Improves ventilation effectiveness to prevent pest breeding ○ Forcibly introduces air into the underfloor space to prevent condensation ○ Maintains a comfortable condition for wood, extending the lifespan of the building ○ Reduces the conditions for the growth of dust mites and mold, making the indoor environment comfortable For more details, please contact us or download the catalog.

  • Ventilation and Exhaust

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top.jpg

Underfloor electronic dehumidification unit 'DRY PRO' Ver3

Contributes to the prevention of condensation and mold under the floor. A new model compatible with the foundation packing method has been introduced.

The "DRY PRO" Ver3 is an electronic dehumidifying and blowing unit for underfloor use, combining a Peltier cooling device with a dedicated stirring and diffusion-type blower. In addition to the diffusion-type model "TYPE-D" for foundation insulation construction, a new model "TYPE-C" compatible with foundation packing construction has been added to the lineup. It can dehumidify even in areas where moisture tends to accumulate by stirring a wide range of air. It helps suppress moisture and condensation under the floor, contributing to the prevention of mold, pests, and decay fungi in wooden parts under the floor. Furthermore, with the version upgrade in June 2024, a powerful dehumidification operation mode will be added. The surrounding temperature range for dehumidification operation (low-temperature dehumidification operation range) has been expanded, allowing operation at surrounding temperatures down to 5°C. 【Features】 ■ Easy installation with a φ22 drainage hole (no drainage pump required) ■ Automatic operation possible with a dedicated indoor controller ■ The direction of the aluminum duct of the blower can be set freely ■ Dehumidification capacity of 1800mL per day (depending on conditions) ■ Uses fluorine-free electronic cooling technology ■ Compatible with underfloor flooding sensors (optional) *For more details, please refer to the PDF document or feel free to contact us.

  • Dehumidifier

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風之介ブロワー24セット無塗装.jpg

24-Hour Ventilation Support System "Kaze no Suke Blower 24"

Improved air conditioning efficiency! A ventilation system that eliminates the causes of condensation and prolongs the life of the building.

The "Kaze no Suke Blower 24" is a system that continuously ventilates the attic for 24 hours, lowering the air pressure compared to the forced-ventilated indoor environment, thereby preventing chemical substances from flowing into the room and creating a safe living environment. It detects the temperature in the attic with a temperature sensor and allows for variable operation. Additionally, it comes with a condensation mode that is effective for removing condensation. 【Features】 ■ Discharges hot air and improves cooling efficiency - Reduces excessive use of air conditioning, benefiting family health and saving on electricity bills. ■ Shuts out condensation - Actively circulates air in the attic to minimize temperature differences, eliminating the causes of condensation and prolonging the life of the house. ■ Supports the health of families and homes - With high ventilation capacity, it effectively expels formaldehyde and VOCs from the attic to the outdoors. *For more details, please refer to the PDF document or feel free to contact us.

  • Ventilation and Exhaust

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Related catalog(5)

Underfloor Ventilation Series "Turbine Unit"

Underfloor Ventilation Series "Turbine Unit"

PRODUCT
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Underfloor ventilation "Kazetaro"

Underfloor ventilation "Kazetaro"

PRODUCT
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Underfloor Ventilation Series "Fuutaro 24"

Underfloor Ventilation Series "Fuutaro 24"

PRODUCT
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Underfloor electronic dehumidification unit 'DRY PRO' Ver3

Underfloor electronic dehumidification unit 'DRY PRO' Ver3

PRODUCT
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  • Catalog download

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Seihō Products General Catalog

Seihō Products General Catalog

CATALOG
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KELLER will exhibit at the International Space Business Expo SPEXA! May 27-29, 2026, at Tokyo Big Sight, South Hall 3-4, S8-40.

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KELLER Pressure is a leading manufacturer of piezoresistive pressure sensors. We will showcase high-precision pressure sensors, compact pressure sensors, and high-speed response pressure sensors with the specifications listed below, focusing on pressure sensors and digital pressure gauges that have a proven track record in the aerospace and aviation fields. We will explain why KELLER Pressure products are chosen in the aerospace and aviation sectors and what sets them apart from competitors using the exhibited products. 【Example of Achievements】 Rocket (fuel, oxidizer), satellites (atmospheric pressure measurement during re-entry), combustion pressure measurement, aircraft attitude control, detonation, International Space Station (ISS), etc. For those who wish to have meetings or product introductions at our booth on the day of the event, we are accepting reservations in advance. Interested parties can contact us at sales.jp@keller-pressure.com. 【Exhibition Content】 We offer a variety of pressure sensors suitable for a wide range of measurements:  〇 Low pressure to high pressure (0.5 kPa to 200 MPa)  〇 Low temperature to ultra-high temperature (-50℃ to 1000℃)  〇 High precision (± 0.01%FS and above)  〇 Compact (Φ 1.4 x 3.1 cm and above)  〇 Ultra-fast response  〇 Digital display pressure gauges

Apr 17, 2026

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Please take a look at Fukuda's gas leak test (hydrogen leak and helium leak)!

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● What is a hydrogen leak detector? It can measure leaks in small areas that could not be detected in air leak tests and can also identify the leak locations. It is a detector that uses a mixture of 5% hydrogen and 95% nitrogen (non-flammable gas: ISO10156:2017) as the tracer gas. ● What is a helium leak test system? It is a leak test system suitable for high-precision or high-pressure leak inspections. The helium leak test system uses helium gas as the detection gas (tracer gas) and detects the helium that has leaked out. It is the leak test method among Fukuda's leak testers that can detect the smallest leaks.

Apr 17, 2026

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In the second half of the 2023 fiscal year, a total of four individuals passed the skills certification exam.

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We are pleased to announce that our employees have newly passed various levels of the "Machine Inspection" certification in the second half of the 2023 fiscal year. ■ Breakdown of Successful Candidates Special Level of Machine Inspection: 1 person Third Level of Machine Inspection: 3 people The special level requires more than five years of practical experience after passing the first level. The pass rate is very low, and it demands advanced and extensive specialized knowledge. Our company has many other certified professionals as well. You can view them through the link below. We will continue to strive for further technical improvement, strengthen our quality assurance system, and assist everyone in the manufacturing industry.

Apr 17, 2026

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The blog has been updated! We exhibited at ISC West in Las Vegas, USA.

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The blog introduces the daily activities of Pal Giken. Please visit the website below.

Apr 17, 2026

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Collaboration between environmental sensors and surveillance cameras

Achieve this with just one unit! Introducing an integrated monitoring solution that automatically detects 'hazards and anomalies' using AI.

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  • PRODUCT

We would like to introduce the Rooster camera solution provided by San Electronics Co., Ltd. This solution goes beyond traditional surveillance cameras and is an integrated monitoring system that contributes to "crime prevention," "safety management," and "business efficiency" through advanced image analysis using AI and collaboration with various sensors. ■ Background In recent years, issues have become apparent in factories, construction sites, and commercial facilities, such as: - Prevention of labor accidents - Response to labor shortages - Advancement of crime prevention and risk management These challenges are difficult to address with conventional "recording-centered surveillance cameras," and there is a growing demand for AI solutions that enable real-time detection and notification. ■ Features 1. Advanced safety management using AI → Contributes to the prevention of accidents and improvement of on-site safety. 2. Crime prevention and security functions → Enables rapid response through real-time anomaly detection. 3. Collaboration with environmental sensors → Achieves both visualization of the on-site environment and risk management simultaneously. 4. Centralized management via the cloud → Supports reduction of operational burden and rapid decision-making. For more details, please refer to the related products and catalogs on this page.

Apr 17, 2026

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