Samuel_Johnston
Member
- Location
- Fort Worth, Texas
Hi everyone,
My question is about 2008 NEC Section 511.3(E)(1) which says:
Areas adjacent to classified location in which flammable vapors are not likely to be released, such as stock rooms, switchboard rooms, and other similar locations, shall be unclassified where mechanically ventilated at a rate of four or more air changes per hour, or designed with positive air pressure, or where effectively cut-off by walls or partitions.
I'm wondering what constitutes a "wall or partition". Specifically can the wall or partition have a man door and still effectively cut-off the space? It seems to me that you would want to maintain positive air pressure in case the seal on the door were to wear out over time.
My question is about 2008 NEC Section 511.3(E)(1) which says:
Areas adjacent to classified location in which flammable vapors are not likely to be released, such as stock rooms, switchboard rooms, and other similar locations, shall be unclassified where mechanically ventilated at a rate of four or more air changes per hour, or designed with positive air pressure, or where effectively cut-off by walls or partitions.
I'm wondering what constitutes a "wall or partition". Specifically can the wall or partition have a man door and still effectively cut-off the space? It seems to me that you would want to maintain positive air pressure in case the seal on the door were to wear out over time.