Civil Engineering Reference
In-Depth Information
On construction documents, show tube pull/clean space require-
ments so that piping, raceway, or other equipment does not intrude into
these spaces.
The designers must provide flood control measures in all primary
HVAC equipment rooms. All floor openings must be protected with 2-
to 4-inch-high curbs to dam loose water on the floor. Floor drains must
be provided adjacent to pumps, chillers, boilers, cooling towers, etc.,
with floors sloped to each drain.
Spill control is also required around areas containing water treat-
ment chemicals. The most cost-effective approach is for the HVAC en-
gineer to specify the use of double walled containers, with spill lips, for
all chemicals. If this is not possible, a 6” high curb is required to contain
the volume of the largest storage container. A 6”-12” deep “pump out”
recess is also required to facilitate cleanup of a chemical spill.
Ceiling Cavity Space
Sufficient ceiling space for HVAC air distribution (ductwork);
HVAC, plumbing, and fire protection piping; and electrical raceway
is required. These space requirements are in addition to the minimum
space required for the ceiling itself and recessed lighting fixtures.
Table 5-2 reflects typical minimum ceiling space requirements for
commercial and institutional building when air secondary systems are
used.
Table 5-2. Ceiling Space Requirements for Maintainability
———————————————————————————————
Lighting: 8” (6” for fixture plus 2” to lift and
move fixture above the ceiling.)
Ductwork: 24” (Ducts with high aspect, ratio width
to height, increase installation costs.)
Piping and Electrical Raceway: 12” (May increase to incorporate fire
protection and/or roof drainage sys-
tems)
———————————————————————————————
Total: 44”
———————————————————————————————
Thus, the minimum floor-to-floor height in a multistory building is
44” + floor-to-ceiling height + structure depth.
When water type secondary systems are used, the ductwork space
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