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

Harold Davis wrote:

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

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

Andy Burns wrote in
o.uk:

Harold Davis wrote:

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

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

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 wrote in
:

Andy Burns wrote in
o.uk:

Harold Davis wrote:

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

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

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.

I mean 3000mm^2!

Harry

In article , Harold Davis
wrote:
Andy Burns wrote in
o.uk:

Harold Davis wrote:

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

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

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.

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.

On Thursday, 23 July 2015 11:13:47 UTC+1, Harold Davis wrote:
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 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

Harold Davis wrote:

Andy Burns wrote:

Harold Davis wrote:

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

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

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.

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?

Harold Davis wrote:
Andy Burns wrote in
o.uk:

Harold Davis wrote:

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

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

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

How about better/bigger air bricks?

http://www.vent-axia.com/range/low-r...ir-bricks.html

On 23/07/2015 12:07, Andy Burns wrote:
Harold Davis wrote:

Andy Burns wrote:

Harold Davis wrote:

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

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

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.

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?

My thought too.