Air supply for flued DFE fires - vent sizing requirements

Where the provisions of paragraph 4.5 do not apply, any room or space intended to contain any other DFE fire should have a permanently open air vent as follows – (a) for a DFE fire in a fireplace recess with a throat, the air vent equivalent area should be not less than 10000 mm2; or (b) for a DFE fire in a fireplace with no throat, such as a fire under a canopy, the air vent free area should be sized in accordance with the provisions in Section 3, Table 3.1, as if the room were intended to contain a solid fuel fire.