This option has units sliding easily on special roller tracks with interlocking draught proof mid rail sections and click handles. This secondary glazing system can be manufactured from a minimum of two to multiple panel sections it is suited to centre astragal windows, double windows and very wide windows and can be manufactured to most sizes.
Guarantee with our system is a full five years. This excellent secondary glazing has a double weather pile draught proof system to BS 7386 and glazing gaskets to BS 2782. The frame comes with a concealed hardwood surround for strength and reduced sight lines with the slender aluminium frames.
Our secondary glazing system has attained an AIRO (NAMAS) test certificate for sound reduction at a gap of 150mm between the primary and secondary windows, with only 4mm glass this shows a sound reduction of between 23.2 and 51.9 dB within the noise frequencies of 100-5000 Hz. This will reduce traffic noise by 31 dB Rt.
Our secondary glazing system has attained a INTERVER test certificate for heat retention achieved 1.868 W/m2K as a U value figure utilising Pilkington K Float as the secondary and 4mm as the primary glass with a cavity of 85mm. The frames and sashes are all polyester powder coated to BS 6496 at 60 microns thick as a standard high gloss and are available in various other RAL colour options.
Glass Options are from 4 to 7 mm, toughened or laminated safety glass and can have various Pilkington glass coatings for heat retention and light reflection. Also available with an Acoustic glass as preferred by sound recording studios.