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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?
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  • 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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Seihō Products General Catalog

Seihō Products General Catalog

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BioJapan2026

We will be exhibiting at BioJapan 2026

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We will be exhibiting at BioJapan 2026 On the day of the event, we will be working alongside our partner companies to address your needs. We sincerely look forward to seeing you there. [Booth No. C-66]   ・LibraMedicina   ・Synmax Biochemical (Intermediate manufacturing, fermentation technology, biotransformation) [Booth No. C-71 (adjacent)] ・Mycenax Biotech (CDMO, our business partner) Translated with DeepL.com (free version)

Sep 14, 2026

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Please let us know your concerns regarding leaks. We may have some suggestions for you. Leak tests, leakage tests, leak inspections, leak detection, container integrity tests, packaging integrity tests...

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Fukuda Corporation has been pursuing leak detection for 60 years and is dedicated to advancing the future of leak testing. 【 Supporting Various Leak Tests: Air Leak Test / Gas Leak Test (Hydrogen Gas, Helium Gas) 】 We develop, manufacture, and sell leak testing equipment to inspect airtightness and sealing performance. We will propose suitable testers and devices for each inspection target. 【 Target Industries and Examples of Inspection Targets 】 - Automotive Industry: Engines, FC components, valves and piping, various parts - Electronic Components Industry: Smartphones, keyless switches, various small sensors - Pharmaceuticals / Food / Cosmetics Industry: Bottle containers, syringes, vials, eye drop containers, pillow packaging, PTP packaging We will propose the most suitable leak testers for each industry. 【 ISO Certification 】JIS Q 9001:2015 (ISO 9001:2015)

Sep 14, 2026

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Fukuda's Technology Column

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This is a collection of links to Fukuda's technical columns. It covers various topics related to leak tests and more... Please check the related links for more information.

Sep 14, 2026

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Understanding occupancy in meeting rooms and private rooms without using cameras | Introducing MotionCatch's applications for offices | You can also download product materials and comparison charts.

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We would like to introduce MotionCatch as a monitoring sensor that can be used to understand office occupancy. Using millimeter-wave radar and AI, it non-contactly detects human movement and occupancy status. Since it does not use a camera and does not record images, it can be considered for installation in places where cameras are difficult to place, such as conference rooms, private rooms, and work areas. 【Suitable for the following situations】 - Understanding whether conference rooms are actually in use - Monitoring occupancy and absence in private rooms and work areas - Checking if absences are prolonged It can be installed on walls or ceilings and has a design that easily blends into existing spaces. Product materials and a comparison table of monitoring sensors can be downloaded from the related catalog below. We also welcome inquiries regarding the conditions for rooms where installation is possible and the number of units, so please feel free to contact us.

Sep 14, 2026

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CCS3 product photo

The new product "Vehicle Count Sensor CCS3" enables efficient occupancy management of large parking lots.

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Hotron Inc. has launched its new product, the "Vehicle Count Sensor CCS3"! This product is a ceiling-mounted sensor that combines infrared and radar technology. It reliably detects vehicles in both directions with a single unit, accommodating traffic during congestion and vehicle passing, thus achieving efficient occupancy management in large parking lots. Additionally, it can be utilized for exit warning purposes in addition to vehicle counting, contributing to the safe and smooth operation of parking facilities. 'Features' - Improved detection performance against changes in road surface during rainy weather by using both infrared and radar. - Equipped with IP67 waterproof and dustproof performance, making it effective even in salt damage areas. - Various settings can be configured from a dedicated app (for Android devices), with current settings easily understandable at a glance. - The base dimensions are the same as the previous model "CCS2," allowing for smooth replacement of existing equipment. *For more details, please refer to the product information, catalog download, or contact us.*

Sep 14, 2026

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