Is a underfloor ventilation fan necessary?

セイホープロダクツ業務本部

Some of you may be hesitant about introducing the effective equipment for pest control under the floor and preventing foundation deterioration (moisture control), known as "underfloor ventilation fans." Why is ventilation under the floor necessary? We have created a page that clearly summarizes the effects of forced ventilation and installation. Under the floor, a certain area of openings is required by the Building Standards Act. In other words, it mandates that there must be a ventilation opening of a certain size for moisture control under the floor. However, when looking at actual single-family homes, there are always ventilation openings, whether they are square grilles or full-perimeter ventilation with foundation packing methods. In recent years, homes using foundation insulation methods (especially in northern regions like Hokkaido) have also been built, but in this 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 foundation insulation methods is still low, but moisture issues are not nonexistent. I would like to touch on this topic on another occasion. Please be sure to read the 【related materials】【related links】. ↓ ↓ ↓

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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.

【Features】 ○ Extends the lifespan of your home ○ Contributes to family health ○ Complies with building standards ○ Improves basic performance ○ Optimal operation with hybrid controller ● For more details, please contact us or download the catalog.
Underfloor Ventilation Series "Turbine Unit Type Bi"
Exhaust type + stirring type unit type

【Features】 ○ Extends the lifespan of your home ○ Contributes to family health ○ Complies with building standards ○ Improves basic performance ○ Optimal operation with hybrid controller ● For more details, please contact us or download the catalog.
Underfloor ventilation unit "Kazetaro"
A comfortable indoor environment! Prevents condensation and extends the lifespan of the building.

【Features】 [Fu-taro Blower Type] ○ Adopts a duct system, allowing for flexible installation ○ Can be appropriately installed under water areas to exhaust humid air [Hybrid Controller] ○ Detects the amount of water vapor in the outside air and independently controls blower type/mixing type ○ When equipped with a phytoncide cartridge → Adds a "sterilization mode" to enhance effectiveness and operate efficiently 【Lineup】 [Underfloor Ventilation Hybrid Control System] ○ Fu-taro Unit Fu-taro Blower Type / Fu-taro Mixing Type [Underfloor Ventilation Fan] ○ Classic all-stainless steel type Fu-taro PF-20W ○ Dedicated external type Fu-taro PF-90R ○ 6-direction powerful mixing type SF-206 ● For more details, please contact us or download the catalog.
Resolve your home concerns such as mold, stains, and poor air conditioning efficiency with ventilation!
"Humidity" that affects the lifespan of the house and the health of its residents. The cause may be the ventilation in the crawl space or attic? Introducing products for humidity control in homes! Free materials on "The Importance of Ventilation" available!

Regarding the demo visit, please be aware that it may not be possible depending on the situation of the COVID-19 pandemic and the region. Thank you for your understanding in advance.
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 your home.

【Other Features】 - Continuous ventilation of the attic for 24 hours - Lowers air pressure compared to forced-ventilated interiors - Prevents the inflow of chemical substances into the interior, creating a safe living environment - Detects attic temperature with a temperature sensor, allowing for adjustable operation - Includes a condensation mode effective for removing condensation *For more details, please refer to the PDF document or feel free to contact us.