Noise control in ventilation
Why is it such an issue? In 1999 the WHO (World Health Organisation)…
Type DTG/WTG Core Only
This grille has been specifically designed for mounting in a heavy duty raised access floor, suitable for computer rooms or other areas where floor supply is advantageous.
Extensive testing by independent laboratories have certified that the grille is suitable for meeting the stringent point loading and safety factor requirements for these areas. The grille is also suitable as a general replacement for 600sq floor tiles where areas of heavy foot traffic and equipment would be experienced.
These are particularly suitable for doors to staircases etc. where air transfer is desirable but fire requirements must be met.
SDO-DDO Selection Data
Air Volume m3/sec | Face Velocity 1m/sec | Pressure Drop 10n/m2 | Face Velocity 1.25m/sec | Pressure Drop 15n/m2 | Face Velocity 1.5m/sec | Pressure Drop 15n/m2 | |||
0.5 | 300 400 | X X | 200 150 | 400 250 | X X | 125 200 | 200 300 | X X | 200 150 |
0.075 | 300 450 | X X | 300 200 | 300 400 | X X | 250 200 | 300 400 | X X | 200 150 |
010 | 450 550 | X X | 250 200 | 450 300 | X X | 200 300 | 300 400 | X X | 250 200 |
0.125 | 500 450 | X X | 250 300 | 550 450 | X X | 200 250 | 350 300 | X X | 250 300 |
0.150 | 600 500 | X X | 300 350 | 600 500 | X X | 250 300 | 450 400 | X X | 250 300 |
0.150 | 600 500 | X X | 300 350 | 600 500 | X X | 250 300 | 450 400 | X X | 250 300 |
0.175 | 450 500 | X X | 450 400 | 550 600 | X X | 300 350 | 400 450 | X X | 350 300 |
0.20 | 600 500 | X X | 400 450 | 750 750 | X X | 300 250 | 600 500 | X X | 250 300 |
0.225 | 500 650 | X X | 500 400 | 600 500 | X X | 350 400 | 450 600 | X X | 400 300 |
0.25 | 550 650 | X X | 550 450 | 700 600 | X X | 350 450 | 500 600 | X X | 400 350 |
Manufactured from aluminium HE9TF extrusion, non-vision chevron blades are spaced at 12.5mm centres.
For specialised light application such as darkrooms, units with ‘W’ shaped cores i.e. two cores back-to-back can be supplied. These are therefore light tight and when painted black allow no spillage of light into the area.
In 50mm increments from 100mm2 up to 1200mm2. Intermediate sizes can also be manufactured.
Standard finish is white 9010 matt. Alternative colours such as silver 9006 or other RAL colours are available at extra cost.
Screw through flange using N°6 or N°8 18mm long self tapping screws.
Where these units are fitted into walls or blockwork it is possible to supply them with extended casing to seal off the cavity.
Why is it such an issue? In 1999 the WHO (World Health Organisation)…
TEK Focus 2020 Wow 2020 already; not only a new year but a…
Ventilating Residential Apartments Why is there a need? In 2017 the population of the UK was an estimated…