"fftt" wrote in message
...
How often do you need to access this heater room? How about an
adjacent "well" next to the existing one & drop in a prefab spiral
stair?

cheers
Bob

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Thanks for the suggestion. The heater room has 3 gas-fired baseboard heater
units and 3 gas hot wanter heater units. It's a 3-unit apartment building.
I have considered various other designs and layouts but, at least for now,
I'm trying to find out more about what the design I have in mind would
involve.