Fire going out dependent on weather, room pressure?

[Pacemaker1000]

Having sorted out my oak problem by making logs smaller I now have another worse issue!

 

fore can be happily roaring away and will suddenly go out and fill room with smoke (door is closed)

seems to be dependent on weather/wind outside and opening a room window relights it?

Don’t think it’s lack of oxygen as have added a direct air duct to go along with air coming from room

Could it be blowback coming down flue? Or difference in pressure?

 

this shouldn’t be so complicated…lol

 

[Mick Dempsey]

Have you posted a picture of the outside flue/chimney?
I can’t remember. 

[Stubby]

If your chimney is not above the apex by a decent amount you could get this problem with with wind in certain directions . Also I would try blocking your " air from the outside vent " and just see if pulling it from the room stops the problem . Could be one fighting against the other . Must be a right pain . I don't have any of these problems  

[5thelement]

That doesn’t sound right at all. If the fire is roaring the heat should be moving fast up the flue, if it is stopping the exit isn’t clear. Is the flue complete from woodburner to exit or have you just got a short flue pipe into the existing chimney?

[Pacemaker1000]

Thanks guys,

too dark for photo of existing cowl.

Flue pipe is correct distance above roofline, however, extension it’s in is single storey connected to taller house.

why does opening a window relight fire? 
 

edit found old pic 

 

 

Edited November 26, 2022 by Pacemaker1000

[GarethM]

No, it would prove your not getting enough fresh air to the fire.

Edited November 26, 2022 by GarethM

[Pacemaker1000]

33 minutes ago, GarethM said:

No, it would prove your not getting enough fresh air to the fire.

Sorry no to what?

 

Fail to see how it can have more air?

Room is huge, vent straight in via duct

 

[GarethM]

Omit the no, it would prove your not getting enough fresh air to the fire.

 

I don't care how big the room or house is, if you open a window and the fire roars.

 

Then the fireplace isn't getting enough air to operate via the room sealed air supply vent.

Edited November 26, 2022 by GarethM

[topchippyles]

That flue is getting downdraft off the main roof i had a similar problem and switched to a different cowl. Could also be a vent issue. 

[Pacemaker1000]

29 minutes ago, topchippyles said:

That flue is getting downdraft off the main roof i had a similar problem and switched to a different cowl. Could also be a vent issue. 

What type of cowl worked?

seen one which spins according to direction of wind