• The visible and non-visible wall thicknesses of main profiles are more than 2.8mm and 2.5mm respectively.
  • The frame and sash are multi-chamber structure, which ensures that the Utench UTD88 series has good thermal insulation performance.
  • Reasonable design of frame and sash of UTD88 series, design value of welding angle strength of main profile, measured value of angle strength and overlap amount of glass with profile meet the requirements of the standard.