The Poikkilaakso School was a pilot project in which some elements typical for hybrid systems
were combined with mechanical ventilation. The ventilation system is a fully mechanical low pressure
system, having central air-handling unit including filtering, heat recovery, fans, heating
coil and silencers. The aim was to achieve low heating and electricity consumption by using demand
controlled supply ventilation to individual rooms, with air transferred via internal rooms to a
single central exhaust and heat recovery between main exhaust and supply ducts.