working out the F A S on a boiler Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[lordsteph]

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

[htg engineer]

Firstly what's the make and model of boiler ?

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

htg

[lordsteph]

the boiler is a potterton kingfisher 11
it is a 105,000 btu input which means it is a 30kwt boiler

[htg engineer]

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

Htg