A building aperture window comprising wood fibre insulation

Method of filling a cavity of one or more building aperture window frame hollow profiles with a wood fibre insulation material by means of a filling system, wherein the filling system comprises

• an insulation storage containing loose wood fibre insulation material,
• a dispensing system comprising a blowing or suction unit, and an outlet nozzle for dispensing the wood fibre insulation material from the insulation storage,
• wherein the method comprises the steps of:
• providing one or more elongated, hollow window frame profiles comprising walls of a polymer material, and wherein the one or more hollow profiles comprises at least one elongated cavity extending in the longitudinal direction of the one or more hollow profiles,
• placing the outlet nozzle at or in the cavity to be filled with the loose wood fibre insulation material through an opening in the one or more hollow profiles, and
• operating the blowing or suction system so as to supply the wood fibre insulation material from the insulation storage through the outlet nozzle and into the cavity, so as to fill the cavity with the wood fibre insulation material.