Page 22
50mm
min
Existing
Concrete
Milner
back
Figure 35 - Masonry Flue
10mm
min
Figure 36 - Pre Cast Flue to BS EN 1858 or BS 1289
125
mm
Figure 37 – BS 715 Flue Box
Fireplace Opening Size (mm)
(Applies to all cases)
Min Max
54B
Height
540 575
Width
365 465
Depth
115 -
Table 1
.