Retain decorative elements of historic systems where
possible. Ornamental grilles and radiators and other
decorative elements shall be retained in place.
Retain the original type of system where a new one
cannot be totally concealed. For example, reuse existing
radiators with new distribution piping or replace with
modern heating-cooling units, rather than adding another
type of system that would require the addition of new
ceilings or other non-original elements.
To the greatest extent possible, insure that space is
available to maintain and replace equipment without
damaging significant features, selecting components that
can be installed without dismantling window or door
openings.
Use custom rather than standard commercial products
where elements are exposed in formal areas.
Select temperature and humidity conditions that do not
accelerate deterioration of building materials.
Where equipment is near significant features, insure that
leakage from pipes and HVAC units does not cause
deterioration. Use deeper condensate drain pans, lined
chases and leak detectors.
168 F A C I L I T I E S S T A N D A R D S
FOR THE
PUBLIC
BUILDINGS
SERVICE
5.19 Alterations in Existing Buildings and Historic Structures
Revised March 2005 PBS-P100
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