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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

CATALOG
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Casting prototype and casting repair.

  • NEW
  • COMPANY

The "Mechanical Stitching Method" by Nichinichisui Road Machinery Co., Ltd. is a new technique that allows for the repair of metal cracks without the application of heat. By using special bolts and reinforcement plates, cracks are physically removed, and repairs are made without affecting the base material with heat. Repairs can be carried out in environments where open flames cannot be used. Since no heat is applied, the disassembly of equipment is minimized. ◎ For more details, please contact us. ◎ If a detailed technical explanation is needed, please contact us.

Sep 27, 2025

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[Cast Iron Repair] We will repair cracks that have occurred in metal equipment without applying heat.

  • NEW
  • CATALOG

The "Mechanical Stitching Method" by Nichinichisui Road Machinery Co., Ltd. is a new technique that allows for the repair of metal cracks without the application of heat. By using special bolts and reinforcement plates, cracks are physically removed, and repairs are made without causing any thermal impact on the base material. Repairs can be carried out in environments where open flames cannot be used. Since no heat is applied, the disassembly of equipment is minimized. ◎ For more details, please contact us. ◎ If a detailed technical explanation is needed, please contact us.

Sep 26, 2025

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Capacity Management (Medium to Large Scale)

Parking lot occupancy management vehicle detection sensor | Hotron Co., Ltd.

  • NEW
  • PRODUCT

Parking space management refers to the real-time display of parking availability and the management of efficient use of parking spaces. By utilizing Hotron's sensors, drivers can quickly discover available parking spaces, enabling efficient parking lot operations. For large parking lots, we recommend the "Floor Management Method" and "Block Management Method," which focus on cost reduction. Sensors are installed at regular intervals to count and manage the number of passing vehicles. This method offers the advantages of easy installation and low costs. 【Target Products】 - Vehicle Count Sensor CCS2 - Ultrasonic Sensor HM-UX2/UW2 For smaller facilities, we recommend the "Parking Space Management Method," where sensors are installed in each parking space to display availability with high accuracy. By providing reliable occupancy information, this method helps reduce unnecessary entry of new vehicles and ensures safe parking lot operations. 【Target Products】 - Occupancy Detection Sensor HM-UX2/UW2 - Occupancy/Pass Detection Sensor HM-LC6 - Occupancy Detection Sensor HM-LC7/LC7-FLS - Occupancy/Pass Detection Sensor HM-S6 - Occupancy Detection Sensor HM-S8

Sep 26, 2025

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【Wandering Prevention】 "Nurse Call Linked Wireless Series" Prevents tripping and disconnection caused by cords!

  • NEW
  • PRODUCT

In facilities operating nurse call systems, we have made bed exit sensors wireless, allowing them to notify in conjunction with the nurse call system. By simply connecting the mat sensor "Foldable Thin Matt-kun," the body movement call "Ugo-kun," and the wheelchair body movement call "Ayumi-chan" to the transmitter HB-RS, you can make the bed exit sensors wireless. The infrared sensor "Just Place Pole-kun" has the transmitter HB-RS built-in. 【Features】 ○ Wireless conversion by simply connecting existing sensors to the transmitter HB-WSK. ○ Bed exit sensors wirelessly notify in conjunction with the nurse call system. ○ Up to 5 transmitters can be registered with a single receiver. ○ The communication distance between the transmitter and receiver is approximately 10 meters. ◎ For more details, please contact us or download the catalog.

Sep 26, 2025

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AAEON Industrial 3.5-inch Standard CPU Board with Intel Core Ultra5/7 Series Processor 【GENE-MTH6】

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Features: ● Equipped with Intel Core Ultra 5 125H/Ultra 7 155H・155U ● DDR5 5600MHz SO-DIMM x2 slots (up to 96GB) (sold separately) ● LVDS x1, eDP x1, DP x1, HDMI x1 ● LAN x3, SATA 6Gb/s x1, 8-bit GPIO ● USB 3.2 Gen2 x2, USB 2.0 x4 ● M.2 2280 M-Key x1 (PCIe 4.0 [x4]/SATA), M.2 3052 B-Key x1, M.2 2230 E-Key x1 ● DC 9~36V input * Heat spreader and fan-equipped heat sink sold separately GENE-MTH6-FAN: Fan-equipped heat sink GENE-MTH6-HSP: Heat spreader * Memory, storage, and OS are sold separately.

Sep 25, 2025

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