Gas Fire Room Vent

I thought the gas regs required that a room with a gas appliance had to have a vent?
Can someone explain why Screwfix are selling a gas fire "which requires no additional room vent"?
http://tinyurl.com/2um4e
PoP
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Less than a certain size, AFAIK, does not require additional room ventilation - 3kW?
It also has an oxygen depletion sensor. This is a simple technique built around the pilot, AIUI, which diverts the flame off of the flame failure bimetallic strip and hence cuts the gas supply.
.andy
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PoP wrote

I am having one of these installed soon and share your concern. Ventilation is needed for 2 reasons AFAIK - to prevent build up of poisonous CO flue gas and to ensure full combustion. The fire has to be installed in a usable fireplace with a chimney, which presumably adequately controls the CO (always assuming there's a proper updraught). So where does the combustion air come from? Even with an oxygen sensor it seems a bit loose and risky compared to the regs covering other gas appliance installations.
Peter
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On Sun, 11 Jan 2004 10:04:21 -0000, "Peter Taylor"

There's nothing to stop you having a vent, of course......
Bear in mind that these decorative flame effect fires are producing CO as a result of the air to the flames being deliberately restricted as part of the design anyway - that's how you get the yellow colour. You don't get full combustion - otherwise the flames would be pretty much blue.
.andy
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On Sun, 11 Jan 2004 10:04:21 +0000, Peter Taylor wrote:

The use of adventitious ventilation is permitted only if it actually works. If the room is so well sealed (I know of several that are) then additional ventialtion must be provided. The test will be that with the doors and windows closed and adjacent extractors set to maximum the chimney can draw all the smoke of a smoke pellet up the flue. The flue may be preheated for 5 or even another 10 minutes if needed. However heating a flue only improves things abit IME.
If it can't then more ventilation is required.
The cabinet heaters are flueless this means they are greatly restricted in their gas consumption. I expect the instructions will specify a list of dos and don'ts which will include specifiying the smallest room size they are intended to work in.
The oxygen depletion sensor is reall the last line of defence against abuse.
--
Ed Sirett - Property maintainer and registered gas fitter.
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For fires of up to 7kW output it is assumed that "adventitious" ventilation (i.e. the natural draughtiness of the room) will do (and when calculating the ventilation requirement for larger outputs one subtracts 7kW to account for this adventitious ventilation).
Obviously if you've hermetically sealed the room you'll be relying on the oxygen depletion sensor to stop the fire killing you with CO. :-)
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On Sun, 11 Jan 2004 12:30:14 -0000, "John Stumbles"

Presumably the Calor gas type fires using a gas bottle work on this principle . Stuart
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This one works because the power is so small. For comparison, a large (not Wok) ring on a gas cooker is 3kW and that won't even have a flue.
Another way to have a fire with no ventilation is to use a balanced flue model, which draws combustion air from outside and shoves the exhaust back out. They are superior for several reasons. Firstly, no chimney is required. An existing chimney can be capped off. They also provide better fuel efficiency and they are much safer as CO can't escape from the appliance. They're not so good for open fire flame effects, though!
Christian.
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