is a gravity grille OK for boiler ventilation

[Harold Davis]

Hi,

I am going to fit a vent in a door to increase the ventilation of my gas boiler.

Will a gravity grille be OK?

I know a grille that's fastenable shut wouldn't be OK. But how about one like this that blows open when needed and can't (short of putting sellotape over it) be stopped from doing so?

Thanks!

Harry

[Andy Burns]

Does it need additional ventilation, is it a balanced flue?

[Harold Davis]

Andy Burns wrote in news: [e-mail]:

The service guy told me that the air brick up by the ceiling isn't enough and that there has to be 300mm^2 top and bottom. The only reasonable place to put a vent on that wall is in the door.

The boiler has got a conventional flue.

Harry

[Harold Davis]

Harold Davis wrote in news:XnsA4E0767277849harolddavis@213.239.209.88:

I mean 3000mm^2!

Harry

[Charles Hope]

I have an air brick in the outer wall at the level of the kicking board under the sink/cupboard units. Then there's a gap in the continuous plinth.

[spuorgelgoog]

I don't think so. A gas vent must be unobstructed.

A flap vent would (presumably) only vent into the room, but any products of combustion blown back down the flue could accummulate in the room. With an unobstructed vent they could vent outward and not build up in the room.

IANACorgi :-)

Owain

[Andy Burns]

I'd have thought it would have to be permanently clear, besides wouldn't most of the gravity type operate the wrong way round, for exhaust rather than intake?

[Tim+]

How about better/bigger air bricks?

[newshound]

My thought too.