Title Goes Here s4

Acoustic Window Specification Super Noise-Lock® W-65

Construction Steel sub frame – Each frame to be fabricated from 2.0mm thick steel sheet manufactured to suit a minimum wall thickness of 400mm (16”). Frames are to be acoustically de-coupled to prevent direct transfer of sound and vibration. Based on vertical panes as standard with options available for angled panes, please contact IAC for more information.

Absorption Internal reveals to be acoustically treated with absorbent material, nylon finished black impregnated Polyurethane Foam 75-95kg/m3. Flame retardant BS:476 Part 6, Class 0 and BS:476 Part 7, Class 1.

Glass Double glazed comprising one pane of 16.8mm laminated safety glass and one pane of 22.8mm laminated safety glass, seated within a 2.0mm thick steel frame, in combination with a minimum of 400mm (16”) thick wall.

Colour / Finishes Steel sub-liners and other internal steel parts to be polyester powder painted to standard RAL 9005 matt finish. External steel capping frames to be supplied to a standard RAL finish from a wide range of stocked colours. Additional colours are available at extra cost.

One-Way Viewing (if applicable) One way viewing windows operate on a room-room light differential of 7:1 i.e. test rooms needs to be considerably brighter than observation rooms. A specialist contractor shall apply such a film and it is advisable to fit once all construction works are complete on site. Other options for one-way viewing such as electronic switchable laminated glass with liquid crystal film are available on request.

Construction / Performance Considerations Frames designed to suit a minimum wall thickness of 400mm (16”). It is possible to provide this high performance with a thinner wall; however glass thickness will increase by acoustic calculation to compensate for a reduction in air gap. All performance data is modelled using algorithms derived from actual laboratory testing on a range of double glazed window configurations with varying air gap, glazing thicknesses and acoustic ratings between Rw47 and Rw68. To obtain the maximum acoustic performance from IAC Noise-Lock® windows the host wall must have a transmission loss equal or better than the selected window unit and obvious leaks and other transmission paths that could give rise to noise flanking or cross-talk should be eliminated or suitably treated.

Acoustic Rating Rw (C; Ctr) 65 (-2; -6) dB to achieve minimum R’w63dB once installed (subject to flanking). STC-65(dB) to achieve minimum NIC 63 once installed (subject to flanking). Certified laboratory performance using standard 400mm (16”) wall thickness arrangement as follows:

Frequency (Hz) 50 63 80 100 125 160 200 250 315 400 500 630 800 1k 1.25k 1.6k 2k 2.5k 3.15k 4k 5k 1/3 Octave Sound 31 38 40 43 46 48 50 54 58 60 64 64 66 69 74 75 74 76 79 82 86 Transmission Loss (dB) Frequency (Hz) 63 125 250 500 1k 2k 4k Full Octave Sound 31 43 52 62 71 75 85 Transmission Loss (dB)