If the chimney is open at the top you need a vent. If it has a ventilated cap, you probably don’t. But it’s not going to save you much by not fitting one
If you intend to use the downstairs fireplace for burning any fuel other than bio eth (that requires no flue) get it lined.
If the chimney is open at the top you need a vent. If it has a ventilated cap, you probably don’t. But it’s not going to save you much by not fitting one
If you intend to use the downstairs fireplace for burning any fuel other than bio eth (that requires no flue) get it lined.
Tl;dr safe than sorry