Renaissance RUMFORD 1500, Руководство пользователя

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Whether the fireplace is installed on a non-combustible floor or a combustible floor, non-
combustible flooring material such as brick, tile, stone, or slate must be used as
finishing material over the hearth extension area.
The non-combustible flooring must have the same minimum dimensions as the hearth
extension (see Table 1 (G-H)) and must be installed on top of the required thermal
protection.
Regular Hearth Extension Raised Hearth Extension
Raised Fireplace Hearth Extension
Figure 19 Hearth Extension Examples