Stove ventilation

mirrormatrix

So currently I have an open fire and considering replacing this with a multi fuel stove. I have no source of ventilation in that room other than the chimney and no ventilation on that floor of the building other than kitchen extractor fan. Would passive ventilation through double glazed windows etc be sufficient?

dathi

no it must have a permanently open vent to comply with building regs window vents can be closed

10-10-20

A stove with an external air vent kit wouldn't need a permanent vent. Would this not be an option?

Wearb

I think ventilation is still required. There was a discussion here a long time ago that said because the door would be open during fueling or deliberately left open, ventilation is required.

Maybe somebody knows if this is a rule or suggestion 🤔

dathi

taken from part J of building regulations TGDs

0.2 Explanation of terms In this Document, the following definitions apply: 

12. Room sealed appliance: appliance whose combustion system is sealed from the room in which the appliance is located and which obtains air for combustion from a ventilated uninhabited space within the premises or from air outside the premises and which vents the products of combustion directly to open air outside the premises

1.2.1 Each appliance should be: (a) room sealed, or (b) contained in a room space or compartment which has a permanent ventilation opening. 

Wearb

Thanks. Dathi. Does they mean room ventilation not required for room sealed stove?

dathi

https://www.boards.ie/discussion/comment/118666735#Comment_118666735

no such thing as sealed stove as door can be opened by home owner to refuel the stove and some also have the air wash system, with air taken from room . room sealed would be a gas or oil boiler where the flame cant be accessed by home owner.

Wearb

I should have more accurately described it as a stove supplied with outside combustion air.

Do they need a room vent? I'm not sure if the regulations state whether it does.

mirrormatrix

Thanks for the feedback all. So I guess then that room ventilation would be regarded as "highly desirable"?

(edit: just re-read your comment Daithi, looks like it is essential. Good to know, thanks)

Furze99

https://www.boards.ie/discussion/2058233780/stove-ventilation

I may be understanding this incorrectly but are you not conflating two different issues:

1) Ventilation as in fresh air coming into the room for normal human health, usually by a wall vent but other methods.

2) Air required by the stove to burn efficiently. Doesn't really matter whether stove or open fire.

Normally, air is drawn up a chimney, so warmer air in house rises up chimney and creates the draught necessary to light the fire or stove. This air is drawn in from either same wall vent or other parts of the dwelling. If your current open fire functions safely, surely the stove will? As both have these air requirements.

Your chimney wouldn't normally offer any ventilation inwards unless you have a down draught through it.

Always a good idea with any fire appliance to have carbon monoxide monitor in the room (as well as smoke detector) and that will give warning if issues arising.

mirrormatrix

https://www.boards.ie/discussion/comment/118683838#Comment_118683838

I guess my email may have come across that way. What i'm wondering about is the ventilation for human health. I have no vents in the walls, so my ventilation for human health as you refer to it comes from the fire. There's a fairly strong breeze down the chimney (particularly in windy weather) and I've never had any trouble with carbon monoxide build up (have an alarm installed). I'm wondering if I close off that fresh air source by putting a stove in, will it lead to a lack of fresh air running through the house. Does that make sense?

Furze99

https://www.boards.ie/discussion/comment/118684768#Comment_118684768

Not really. The only way I think a normally functioning chimney aids room ventilation is by warmer air rising up it and thus drawing in air from other parts of the house, provided it's not too airtight. Putting a stove in and closing the air inflow vent on that would stop or greatly diminish that circulation. Putting a stove in and having it lit would be much the same as the open fire. You can put a wall vent in but that won't do much unless the air is drawn in for some reason. To get an idea for this and particularly if house is two storey, open an upstairs window and climb a ladder outside up to window level. If it's a cool day outside, you'll immediately feel a warm flow of air coming out the window onto your face.

Grassy Knoll

i am replacing an open fire with a Henley inset stove. The Room currently has no external wall vent, but would need one if the appliance is not externally vented. The fireplace backs onto an internal room so an external vent is not a runner that way. I was wondering if I could instead place a vent duct into the void under the suspended timber floor as the air supply. Essentially I would sink a hole through the timber floor under the back of the fireplace into the void and run the vent pipe in. This is about 1 foot deep and is itself vented. Any views on this as a runner?