working out the F A S on a boiler


Postby lordsteph » Fri Oct 17, 2008 8:37 pm

Can anybody please help me ,British gas have told me that the rules have changed and that the terracota air bricks in my utility room which house my 105,000btu boiler are no longer sufficient ,
How can i work out what size air bricks i should have and what the F A S should be.
I have hepworths technical spec sheet on their air bricks
The boiler is boxed in and the flue exits through the roof
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Postby htg engineer » Mon Oct 20, 2008 7:17 pm

Firstly what's the make and model of boiler ?

Read the data badge, what's the Heat Input of the boiler ?

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Postby lordsteph » Mon Oct 20, 2008 7:56 pm

the boiler is a potterton kingfisher 11
it is a 105,000 btu input which means it is a 30kwt boiler
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Postby htg engineer » Tue Oct 21, 2008 5:39 am

30kw - 7 x 5 = 115cm2 ventilation required.

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