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Gas Fire Venting

Postby cgwalsh » Wed Apr 02, 2008 8:13 pm

I am looking to buy a new gas fire to replace an old one, the new one will fit flush with the wall. A lot of the fires we like indicate they need venting. Does this mean the room needs a vent on an outside wall or is there some sort of vent required on the fire?

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Simply Build It

Postby htg engineer » Thu Apr 03, 2008 6:55 pm

The manufacturers instructions will tell you if any purpose made ventilation is required.

Gas fires with a heat input of 7kw or below do not require any ventilation.
7kw> do require ventilation.

DFE (decorative fuel effect) fires require 100cm2 purpose made ventilation.

To work out the ventilation required for open flued appliances, you take the

(Heat Input) - 7 x 5 = ventilation required

7 is the 7cm2 adventitious ventilation is allowed for in every room, this is provided by tiny cracks around doors and windows etc this is why a gas fire of <7kw does not require any ventilation as 7(cm) - (7kw) = 0
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