Guidance on the Control of Odour and Noise from ... - Defra
Guidance on the Control of Odour and Noise from ... - Defra
Guidance on the Control of Odour and Noise from ... - Defra
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Ro<strong>of</strong> Extract<br />
Fans (Vertical<br />
Jet Discharge<br />
with Centrifugal<br />
Impellers)<br />
items<br />
• Easy removal for cleaning <strong>and</strong><br />
maintenance<br />
• Compact<br />
• Good temp range when motor is<br />
outside <strong>of</strong> air stream<br />
• Easy removal for cleaning <strong>and</strong><br />
maintenance<br />
• No space restricti<strong>on</strong>s<br />
• Good external appearance<br />
• No discharge ductwork required<br />
50<br />
• Forward curved fans should<br />
<strong>on</strong>ly be used for supply systems<br />
• Temperature limitati<strong>on</strong>s, but<br />
suitable for kitchen use.<br />
• Requires good ro<strong>of</strong> access for<br />
maintenance<br />
• More expensive than inline/axial<br />
models<br />
The noise characteristics <strong>of</strong> <strong>the</strong> various fan types are presented in Table 4.3.
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