One hour's fan rotation reversal has long been the standard in modern batch kilns. All the same, there have been few proper studies into how lumber is affected by fan reversal time. Because changing fan rotation parameters in the control system is easy, Valutec, Luleå University of Technology and RISE wanted to conduct a study within the Bioinnovation project into whether a longer reversing time can help improve the drying process.

The last six months' sales to Germany and Austria amount to an order value of just over EUR 24,7 million for Valutec, which supplies kilns to the sawmill industry. The company has sold a total of ten continuous lumber kilns to the markets during the period, which is a fourfold increase compared to the annual average over the last five years.