It is specified in Section 3.2.1.5, part C2, of the National Building Code of Finland that the total surface area of underfloor ventilation openings must be at least 4 per mil of the surface area of the underfloor space. The Finnish Society of Indoor Air Quality and Climate provides instructions for determining the ventilation needs of different underfloor space types. To determine your project’s specific ventilation needs, please contact a skilled HVAC or structural designer.
For the VILPE Ross 125 ventilation pole, an opening of at least Ø 135 mm must be provided in the foundation, and for the Ross 160 ventilation pole, an opening of at least Ø 170 mm must be provided.Free surface area of the openings for VILPE Ross ventilation poles:
VILPE Ross 125: 95 cm²VILPE Ross 160: 201 cm²VILPE Ross 200: 314 cm²
VILPE Ross ventilation poles can also be used for:
Ventilation of radon gasProviding inlet air to fireplacesProviding supply air for mechanical or passive ventilation