Required ventilation?

[macka09]

Am I right in thinking that a gas fire which is less than 7kw does not need any other ventilation other than adventitious air???

 

[wetdrip]

I thought it was 5kw, as in the same for wood burning stove as gas fire as per pasted below, though someone will come along soon and put me right:

If the output of your stove is greater than 5kW then you do need permanent ventilation to the room. There is no stipulation in the building regulations as to the type of vent that must be used however examples would be air bricks, core drill vents etc. We stock a range of HETAS approved air vents in the
For stoves with outputs over 5kW the free area requirement of the vent is 550mm² per kW over and above 5kW. So an 8kW appliance would have a free air requirement of 1650mm². The amount of ventilation required does vary for other types of appliance such as open fires or stoves with flue draught stabilisers, please contact us or your HETAS approved installer for advice.
A sufficient air supply for a solid fuel fired appliance is very important. It ensures that complete combustion of the fuel occurs and also allows the chimney to function correctly. An insufficient air supply can have serious consequences. Smoking will occur and also increased levels of carbon monoxide will be produced which can be life threatening.

And here's some further reading.
[DLMURL]http://www.radmidlands.co.uk/Downloads/VentilationDom.pdf[/DLMURL]

 

[newcastle phill]

Depends if its flueless or open flued.
Flueless no allowance.
Open flued 7kw adventitious allowance then 5cm sq per kw net above

 

[newcastle phill]

But follow MI

 

[Geyser]

Still does if spilling so check mi

 

[macka09]

It's a gas fire 5.13kw

 

[Atouchofgas]

Generally speaking it shouldn't require a vent, but as already said read what the instruction manual says regarding this

 

[GrahamM]

As mentioned. Generally speaking it should not require purpose provided ventilation but this is subject to specific info from MI's as usual.

 

[stevetheplumber]

It's a gas fire 5.13kw

its 7kw for a flued fire that isnt spilling

 

[kirkgas]

Over the years we have all used the phrase "open flued fire under 7kw NET HI DONT need addition permanent ventilation" however we should actually be saying "PROBABLY WONT," and can't be confirmed till I've done a spillage test, and it's passed, as we assume till we do the tests, and some get into a comfort zone with adventitious and don't check properly

 

[Atouchofgas]

Here's one for you kirkgas. New build, concrete floor, triple glazed and a 6.9 of fire. Passes spillage where's the adventitious ventilation coming from

 

[kris]

Size of room.

 

[Atouchofgas]

3 x 4 x 2.4

 

[Ermintrude]

Under the door and from the trickle vents.

 

[kirkgas]

Atouchofgas I don't know, other than erm's guess, but the bottom line is if the fire is working it's getting O2 from somewhere

 

[newcastle phill]

Im gonna be bold and say outside

 

[kris]

If there wasnt oxygen then you wouldnt be able to breathe in the room ,, so unless the room is rubber sealed and inadequate size then it will always have oxygen lol

 

[kris]

like erm said , trickle vents , even if triple glazing , airflow will always be accounted for in new builds , and if the joiners p00p there will be 30mm gap under door, ( really p00p joiner )

 

[newcastle phill]

If hes really really poop 30mm beteen floorboards too !

 

[Atouchofgas]

I know that it can get it from trickle vents etc etc, the reason I was asking was hypothetically as some new builds have air tight tests,

 

[kris]

Just remember drains need to be air tested , but once test is done the vent pipes open to atmosphere, same with air test, certain parts will get covered and uncovered,

 

[Reg Man]

Depends on the fire, Fluless, Conventional, LFE, DFE and the Mi's instructions. Some of the DFE's require 100cmsq regardless of the 7kW. BS5871 parts 1 to 4.

 

[stevetheplumber]

mis are the main thing to look at but many will quote the relevant BS

 

[AlexGas]

Don't even mention no chimney flueless gas fires...

 

[firemant]

The 7Kw does not apply to newer homes. If the air permeability of the home is less than 5M3/h/M2, you do not have AA.

See lat line if small print PAGE 46:
http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADJ_2010.pdf

 

[snowhead]

The 7Kw does not apply to newer homes. If the air permeability of the home is less than 5M3/h/M2, you do not have AA.

See lat line if small print PAGE 46:
http://www.planningportal.gov.uk/uploads/br/BR_PDF_ADJ_2010.pdf

And page 76 to see what needs to have been done to get anywhere near 5M3/h/M2

 

[lame plumber]

easy to see if all the holes are sealed, there's mildew all over the walls

 

[firemant]

And page 76 to see what needs to have been done to get anywhere near 5M3/h/M2

Good point SH, but the main thing is to be aware of the requirements, and in a new home ascertain the degree of air changes. Have you not noticed that fireplace openings are now often boarded over?

 

[Reg Man]

Refer to section 1.4 in part F. Part F must not be read in isolation of other building regulations such a part J.

 

[Baloo790]

I was always told under 7kw need no vent UNLESS evidence of draft proofing. New houses are sticky because I always asked what's a new house? 2 year old, 5 or 10. Regardless of bs, MI always over rule anyways.

 

[Reg Man]

Refer back to post 22. For instance: BS5871 part 3 section 8.2 100cm2 ventilation shall be provided unless manufacturers state otherwise. There is ventilation for breathing and ventilation for fossil fuel burning appliances; they are two different things.

 

[Reg Man]

BS5871 part 3 refers to DFE fires.