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Studio KF 520

Internorm Studio KF 500


If you’re looking for a window that is entirely flush from sash to frame, then the Internorm Studio KF520 uPVC aluminium window, is perfect for you. Once the frame is rendered into the brickwork on three sides, only the unique narrow and square edged sash frame remains visible.

With thermal insulation U values as low as 0.63, this window more than qualifies for its Passive House certification and makes it a very cost effective solution. The Studio KF 500 Internorm by Cherwell window is compliant with the top level accreditations of Secured by Design and Lifetime Homes, key “must have” attributes architects require.


  • Flush internal sash.
  • ITEC Secure locking which renders the window virtually impossible to leverage open from external.
  • Slimmer external SR frame option at 85mm.


Internorm technology is integrated into this energy efficient window offering technological advances that are revolutionary in more ways than one:

  • I-tec Ventilation ensures fresh air at an ideal room temperature 365 days of the year.
  • I-tec Glazing boasts all-around fixing ensuring optimum stability, thermal insulation and sound reduction.

As a result of this innovative Internorm technology your KF 520 window truly continues to amaze.

If you wish to know more information on the Internorm Studio KF520 uPVC aluminium window please click on the brochure button to view the product in more detail. Alternatively, contact us using the make an enquiry button and we will be in touch shortly or you can also speak to a one of our team on 01295 270938 or visit one our showrooms, located in;

internorm Studio KF 520
  • Thermal insulation (in W/m2K)

    up to 0,63

  • Sound reduction (in dB)


  • Security


  • Locking


Technical Specifications

Dimensions (mm)
Frame construction depth 95
View width frame/sash 113
View width flying mullion (2 sashes) 133
View width transom/mullion (2 sashes) 187
Opening Versions
Fixed yes
Turn and turn/tilt yes
Tilt yes
Sliding window yes
Lockable doors yes
Sliding doors yes
Doors with threshold yes
Outward opening doors yes
Quantity 3
Colour Black
I-tec glazing yes
I-tec Ventilation yes
I-tec Insulation yes
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