Sigma IB1100 B A C, 2.0Creating the Cavity, Ideal Cavity Dimensions, IB600, IB850

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2.0Creating the Cavity:

The dimensioned drawing below shows the size of the opening that must be created to keep

combustible materials at the required distance from the heater.

Note: It is not necessary to line the side, top or back of the cavity.

B

A C

Ideal Cavity Dimensions:

(Timber framed walls)

All dimensions in millimetres		B	C
	A
IB600	700	585	565
IB850	965	560	565
IB1100	1265	560	565
(Masonry Cavity)
	A	B	C
IB600	600	570	520
IB850	950	545	520
IB1100	1265	565	565
	(Check offset. Refer 2.2)

2.1Where possible, it is recommended that cavity is made slightly larger than the above dimensions to give the installer the maximum amount of space to work in.

2.2The IB1100 and IB850 have their electronics compartment protruding from the left hand side of the fire and the resulting offset needs to be taken into account when installing into a tight masonry cavity.

2.3If fitting the heater into a non-masonry wall, the first thing installers MUST do after unpacking the fire is to bend and re-fix the triangle shaped spacers on each side and rear of the heater. The picture below shows how this is done. Note: This is not necessary for masonry installation.

2.4If the fire does not fit into the timber cavity that has been created, (after these spacers have been put in place), then THE CAVITY MUST BE ENLARGED.

3.0 Ventilating the Cavity

When a cavity is being created for the fire in a timber framed wall, ensure that it is not a fully sealed space. Ventilation MUST be provided at the base of the cavity and, if possible, leave the top of the cavity open into the ceiling space otherwise another vent at the top of the cavity will be required.

NOTE: If an in-ceiling ventilation system is installed (such as

a DVS or HRV system), particular care must be taken to isolate the cavity air space from the ceiling air space. Failure to do so will result in the negative air pressure that is created in the ceiling space, by the ventilation system, potentially having a detrimental

G8860 _4 Installation Manual NZ