Figure 21: Cavity dimensions.
BRSL.BODYB
BDFD.BODYB
5055.633-B
Existing Fireplace Preparation
The Bristol and Bedford Gas inserts are certified to be installed into pre-existing approved fire place cavities.
The minimum cavity requirements are listed in Figure 21 below.
Before installing the Bristol or Bedford inserts have the chimney swept and fireplace, including ash dumps
and clean outs, cleaned to remove any creosote and soot residue that may cause odors and stains after
the insert has been installed. The fireplace chimney should be in good working order and made of non-
combustible material. Make sure chimney cleanouts fit properly.
When preparing an existing fireplace to install a gas insert, any modifications that will compromise the
integrity of the existing fireplace are not allowed. To make way for the insert’s venting the fireplace flue
dampener may be blocked open or removed. Refractory, glass doors, screen rails, screen mesh and log
grates can be removed from the fireplace before installing the insert. Also, smoke shelves, shields and baffles
may be removed if attached by mechanical fasteners. Cutting any sheet metal parts of the fireplace, in which
the gas fireplace insert is to be installed, is prohibited.
If the factory-built fireplace has no gas access hole(s) provided, an access hole of 1.5” (37.5mm) or less may
be drilled through the lower sides or bottom of the firebox in a proper workmanship like manner. This access
hole must be plugged with non-combustible insulation after the gas supply line has been installed.
Dimension
Bristol
Bedford
A
16-7/8”
16-7/8”
B
21”
23”
C
26”
34”
16
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