New homes
SESERAGI® S400
Ductless balanced heat-recovery ventilation. Wall-mounted units switch between supply and exhaust.
Heat-recovery ventilation
without ducts.
Wall-mounted units alternate between supply and exhaust. No ducts in the ceiling, no duct cleaning.
Patented JP Patent No. 5937811 10-year warranty on fan unit and heat-storage element※ SESERAGI® S400
SESERAGI in figures
Heat exchange efficiency
up to95%*1
Power (4 sets per home)
6.4W*2
Fan sound at airflow level 1
9.2dB(A)
homes across Japan
10,000+
- *1 Third-party test by TÜV SÜD (Germany) to FprEN 13141-8:2021-07: 95.0 % at the minimum airflow of 13.3 m³/h and 5 °C outdoor temperature (85.3–88.5 % at the reference airflow of 48.7 m³/h).
- *2 The number of units depends on the building.
- ※Shipments from 1 November 2026, subject to the warranty terms (Japanese).
Between exhaust-only ventilation and ducted systems
Most Japanese homes use exhaust-only ventilation (type 3): outdoor air comes in through simple wall inlets – cold in winter, hot and humid in summer. Ducted balanced systems recover the heat, but need space above the ceiling and ducts that must be designed, installed and cleaned. SESERAGI® is the option in between.
No ducts
Nothing runs through the ceiling space, so no duct design, no duct installation and no duct cleaning. Maintenance is done from inside the room.
Efficient and quiet
Heat exchange efficiency up to 95 %*1. Power consumption 1.6 W per set. Fan sound 9.2 dB(A) at airflow level 1.
Proven, with planning support
Used by builders all over Japan in more than 10,000 homes. For every project we prepare the ventilation calculation, the layout drawing and the quote.
Products
Renovation
Kaiteki Kanki Reform KKR100
Turns an existing 100 mm air inlet into heat-recovery ventilation – no new wall openings, no ducts.
Local exhaust fans (PF002), outdoor hoods, fire dampers and filters are described on the Japanese site.
How we work
We supply SESERAGI® through builders, renovation companies and architects in Japan. We do not sell directly to private customers: if you are building a home in Japan, please show these pages to your builder.
Project documents (ventilation calculation, layout drawing, quote) and installation manuals are in Japanese. We are happy to answer questions in English.
Planning a project in Japan?
Send us the floor plans and we prepare the ventilation calculation, layout drawing and quote free of charge (documents in Japanese).