The reference to flammable materials highlights the need to assess whether the zone might comprise material/vapour that could trigger a fireplace to be sustained within the occasion of an ignition source arising in adjacent wiring. Examples embrace the potential presence of gas vapours, dust/lint accumulation and contaminated insulation blankets. EWIS in areas below doorways, flooring, entry panels, and servicing bays are susceptible to corrosion or contamination because of their exposure to the elements. Snow, slush, or excessive moisture must be removed from these areas before closing doorways or panels.

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