Fireplace Opening - Flavel FBFC**MN2 Installation, Maintenance & User Instructions

2.2 FIRE PLACE OPENING
2.2.1 The front opening of the fire place must be between 410 and 420mm
wide, and between 555 and 570mm high. If the opening exceeds these
dimensions then a surround must be constructed from suitable non-
combustible material to produce a suitable sized opening. Any surround
must be suitably sealed to the fire place to prevent leakage.
See fig. 3 below
Fig. 3
Minimum Flat
Sealing Area
590mm minimum
2.2.2 The minimum / maximum sized distances between the firebox mounting
flange and outside wall are shown below in Fig. 4
Fig. 4
Minimum Installation Depth
285mm MC / RC models
Minimum Installation Depth
248mm EFC models
490mm minimum
Fire Opening
410mm minimum
420mm maximum
Maximum Installation Depth 625mm
with standard flue duct MC / RC models
Maximum Installation Depth 588mm
with standard flue duct EFC models
Maximum Installation Depth
1010mm with extended flue duct
on MC / RC models
973mm on EFC models (cost
option extra) - suitable for NG
models only on all control options
7
555mm
minimum,
570mm
maximum