Technical features correspond to BDEK
M1 cleanliness class certified
Inner surface is protected against dust and dirt
Inner surface is oil- and dust-free
Low odour emissions
FLEK is a spiral duct/tube of hot-dip galvanized sheet steel, length 1150 mm. Available in three diameters: 100, 125 and 160. FLEK is part of the VELOFLEX ducting system, designed for one-family houses.