Noise control in ventilation
Why is it such an issue? In 1999 the WHO (World Health Organisation)…
Type SEGO & Type SEGRO
A non-vision side wall extract grille suitable for use within perimeter frieze or ceiling extract systems for shops, offices, restaurants and industrial applications. This 50% free area vision-proof extract grille gives a linear appearance and can be used where eggcrate grilles, due to their see-through properties, are not desirable.
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SEGO Selection Data
Air Volume m³/sec | Spigot Velocity m/sec | Grille Size width x height | Pressure Drop n/m² | Sound Rating nc |
---|---|---|---|---|
0.05 | 1.66 1.66 | 300x150 200x200 | 14 14 | 16 16 |
0.10 | 1.33 1.33 1.66 | 600x125 500x150 400x200 | 8 8 14 | 20 20 28 |
0.15 | 2.4 2.22 2.5 | 500x150 450x150 300x250 | 31 21 31 | 30 28 31 |
0.20 | 2.13 2.22 2.22 | 750x150 600x200 500x200 | 21 23 23 | 29 30 30 |
0.25 | 2.08 2.08 2.00 | 800x200 700x200 600x250 | 21 21 20 | 29 29 27 |
0.30 | 2.14 2.18 2.22 | 700x250 600x300 500x300 | 21 21 22 | 30 30 31 |
0.40 | 2.22 2.13 2.22 | 900x250 750x300 700x300 | 21 20 21 | 32 32 32 |
0.50 | 2.5 2.56 2.6 | 800x300 750x300 650x350 | 26 26 28 | 35 35 36 |
0.60 | 2.22 2.29 2.22 | 900x350 750x400 700x450 | 21 18 21 | 33 33 33 |
0.70 | 2.33 2.33 2.40 | 1000x350 800x400 650x500 | 22 22 24 | 35 35 37 |
The core is mounted with horizontal angled fins mounted in aluminium HE9TF frame.
50mm increments from 100mm square up to 1200mm in one piece. The unit can be produced as a linear diffuser up to 2.5mtrs in sections and joined together using alignment keys.
Epoxy polyester powder coatings from the RAL range, base colour being white 9010 matt.
Screw through flange via N°6 or N°8 18mm long self tapping screws or concealed fixings to ductwork at the rear.
Opposed blade dampers, non-standard sizes and removable cores with provisions for disposable panel filters are also available. An alternative design of grille has also been shown with a single slatted 45°blade.
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