36 HE250 - Installation and Operation Manual
6.3.1.2 On the floor or on a raised base of less than 4" installation (R value for the hearth extension
required)
In the case where the fireplace is installed directly on the floor or on a raised base of less than 4", an R
value for the hearth extension is required. In these case also, the joint between the hearth extension and
the fireplace (E) must be protected by a non-combustible material. For example, a sheet metal (not
included).
Note that the floor under of the fireplace should match or exceed the height of the floor protection.
MINIMUM MEASUREMENT
A noncombustible floor protection with R value insulation equal to or greater than 1.00 must be installed in
front of the unit. For more details see Section 6.3.2: Minimum Hearth Extension Requirements. The use of
an R value is convenient when more than one material is going to be used in the hearth extension to cover
the combustible surface. This is because R values are additive, whereas K values are not. To find the
corresponding R factor to use for some selected materials, please see Thermal Characteristics of Common
Floor Protection Materials table.
CAUTION: DO NOT LEAVE CARPET UNDER THE FLOOR PROTECTION IN FRONT OF THE FIREPLACE
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