Athena Technologies A88028 manual PRE-CAST Flue of Minimum Size Fig

2.2.2 PRE-CAST FLUE OF MINIMUM SIZE (Fig. 2)

This fire can be installed into a properly constructed pre-cast flue conforming to B.S. 1289 : 1975 or B.S. 1289 : Part 1 : 1986 or B.S. 1289 : Part 2 : 1989 of at least 3 metres effective height and having flueways of at least 198mm by 67mm or equivalent cross-sectional area with no dimension less than 63mm. The fireplace opening width must be between a maximum 457mm and a minimum 305mm. The fireplace opening height must be between a maximum of 585mm and a minimum 560mm and a depth of at least 120mm above the hearth level.

NOTES:

1.The minimum dimensions for the flat area around the opening are 686 mm high x 635 mm wide.

2.The flue spigot restrictor MUST NOT be fitted.

Ensure that any mortar fangs between the blocks do not protrude into the flueways and if raking blocks are used they are fitted according to the manufacturers instructions and mortar is not allowed to drop down and accumulate in the raked portions.

CHECK THE FLUE FOR GOOD DRAUGHT AS DETAILED IN SECTION 2.2.1.

PRECAST FLUE INSTALLATION
	*
	N
I
M
5
3
6
		MAX	MIN	MIN*
		615	560	686
12
0
MI	mm	X
N
		A
	M
	7	N
5		I
4	5	M
	0
3				Fig. 2
5