Josko combines three benefits in the Safir composite/aluminium window: Even, slim and robust. The revolutionary uPVC/aluminium also lets more light in thanks to its slimline frame, offering lots more besides.
Incredible value heat insulation
UW 0.72 W/m2K
System strength
100 mm
Unique fitting evenly with the glass
Rebated by only 3 mm between the glass and frame externally
Even fitting
Even with the frame internally and externally
Fibreglass window sash
Greater robustness, less distortion and lighter
Extremely slim frames
20% more incoming light
Heat insulation
Environmentally friendly thermal foam core
Basic burglary protection
Standard mushroom-pin lock (optional RC2)
Fitting
Fully concealed with rotary limiter as standard
Profile contours
Effortless cleaning
Three seals as standard
Optimal sound and heat insulation and seals
Inclined glazing rebate lip
Enhanced heat flow and reduced condensation