Helsinki apartment house

Showcases the Vilpe® S series

Known for a distinctive look and high-quality apartments, Asunto Oy Helsingin Töölön Oscar is a block of flats situated in the Etu-Töölö district of Helsinki. Completed in 2009, this 8-storey multiple-entrance building comprises 64 apartments, three commercial suites and numerous common areas such as stairways, a basement and a guest room. The apartments range in size from 45 to 133 sq. metres and some of them are located on two floors. There are 180 separate areas in the building requiring ventilation.

The building is composed of prefabricated concrete units. Standing seam sheet metal roofing was used on the sloping parts of the roof and rubber bitumen membrane on the flat parts. The angle of the sloping parts is very steep, making the choice of roofing products and installation extremely demanding.


The VILPE® S in its element

Each apartment in the building has its own system for incoming and exhaust air exchange including both heat recovery and cooling functions. The system is based on VILPE® E250S roof fans, heat recovery ventilation units for incoming air installed in the sanitary facilities of the apartments, and separate VILPE® E190S roof fans connected to cooker hoods in the kitchens. In common areas there are individual ventilation units for incoming air for each stairway. Exhaust ventilation in these areas and in the basement storage area are handled with VILPE® E190S and E250S roof fans. Drains are ventilated with VILPE® sewer ventilation pipes. VILPE® products were delivered direct to the building site from SK Tuote’s Korsholm warehouse at the beginning of 2009.

VILPE® products were chosen for the building on the basis of both their installation and operational features. The VILPE® S roof fans are developed for installation on horizontal surfaces. They are equipped with single-phase motors and controlled with transformers, or, as in this case, with the step transformer of the heat recovery unit. The VILPE® E190S is designed for 125 mm pipes and a 300 x 300 mm VILPE® S installation set is needed for installation. The VILPE® E250S is designed for 200 mm ducts and installation requires a 400 x 400 mm installation set.

HVAC planning proved challenging

The HVAC planning of the building was the responsibility of LVI-insinööritoimisto Helsingin Kartech Oy, under the direction of its managing director Hannu Kallo. According to Kallo, the slope of the roofs and the large number of ventilation ducts in relation to the installation surface were challenging factors.

”There were nearly 200 units to be installed on the roof and it was a real challenge to fit all the ducts into the installation boxes. Maintenance of the equipment units also had to be thought out in the planning stage. In the end, we chose a solution in which the roof fans were mounted in rows on top of installation boxes with maintenance platforms between them. To improve safety and usability, we even considered attaching the hoods of the roof fans with safety cables so that they would not fall, for example during maintenance,” explains Hannu Kallo.

The cooling compressors for the apartment-specific heat recovery units posed a challenge of their own as the temperature of the condensate air can rise as high as +60 ºC.

“There really aren’t any roof fans on the market that withstand such high temperatures. Products suitable for the building were available only in the VILPE® range as the motor manufacturer was the only one to confirm the heat endurance of the motors,” Kallo explains.




8-storey apartment building Helsinki, Finland

Roof coating: Standing seam sheet metal roofing (sloping parts), rubber bitumen membrane (flat parts)

VILPE® products: Nearly 200 S-series roof fans (E190S, E250S) with installation sets. Drains ventilated with VILPE® sewer ventilation pipes

Custom solutions: 180 separate areas in the building require ventilation. Each apartment, stairway and basement storage area has its own system for incoming and exhaust air exchange. Due to a very steep roof angle, the installation boxes have custom maintenance platforms


VILPE® Insight - SK Tuote Oy customer journal 2012, VILPE® Weathered 2015.