KF 320

The KF 320 uPVC system is a sleek, flush fitting profile designed in our Studio style. Capable of being manufactured into a range of window and door variants, the KF 320 is the perfect solution for a wide range of commercial applications.

With a slim 71mm frame depth and advanced features, the KF 320 delivers a great all-round performance for a flush fitting uPVC window. The design of the KF 320 can also be applied to an aluminium clad uPVC profile.

  • U-value icon
    Thermal insulation (in W/m²K)
    Uw up to 0.65
  • secure windows
    Sound reduction (in dB)
    35 - 45
  • soundproof windows
    Secured by Design & PAS 24
  • concealed window locks

Profile Options

kf 520 upvc windows
I-Tec Glazing Logo Latest
PAS 24 windows
Secured by Design windows

Technical Specifications

Dimension (in mm)

  • Frame construction depth 71
  • View width frame/sash 97
  • View width flying mullion (2 sashes) 100
  • View width transom/mullion (2 sashes) 154
Opening versions

  • Fixed
  • Turn and turn/tilt
  • Tilt
  • Sliding window
  • Lockable doors
  • Sliding doors
  • Doors with threshold
  • Outward opening doors

  • Quantity 3
  • Colour Light Grey

Profile Features

Glass Sash

The KF 320 is unique among our uPVC systems in that the design tricks the naked eye. At first glance, it appears as a fixed piece of glazing, but discreet handles and a glass sash allow it to open and close as our other systems do.

Flush Profile

Flush sash windows and doors are fast becoming popular for end users, making them an excellent option for your commercial project. A narrow, square edged design is incorporated to complement the flush fitting KF 320 uPVC system.

Triple Gaskets

All Internorm windows, including the KF 320, have triple gaskets around the perimeter. In doing so, weatherproofing is achieved to a reliable, comprehensive, and long lasting standard. End users are protected against the elements with Internorm products.

Surrounding Bonding

Our I-tec Glazing is fitted with surrounding bounding upon installation. This enhances the thermal efficiency of the KF 320 uPVC system, while simultaneously making the window harder to damage or break into, improving security standards.


Straight line handles are the standard offering for the KF 320. They are easy to operate for the end user and add a stylish finish these uPVC systems. They are superb for all commercial projects, whatever the sector.

Internorm Handles


The KF 320 uPVC window system comes with I-tec Glazing as standard. Our energy efficient glazing improves the security standards of the window and improves acoustic insulation. It complements the KF 320 profile perfectly.

Internorm Glazing


Our colour range is vast, and our finishes are always weatherproof and long lasting. Explore the various options available with the KF 320 uPVC system today. We have options for both contemporary and traditional application.

Internorm Colour Range