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This standard includes general guidelines for locating new mechanical and/or electrical systems in historic buildings with minimal adverse impact on the building’s appearance or character.

General:

• When possible, install new systems that are reversible.
• Reuse existing holes where possible.
• Use existing interstitial spaces to conceal systems.
• Conceal wiring when possible.

Ductwork:

• Conceal piping and ductwork as much as possible, but DO NOT install suspended ceiling systems to do so.
• If suspended ceiling systems must be installed, DO NOT allow system to abut glazing. The historic appearance of the window should be maintained where possible. This can be accomplished by 鈥渂oxing鈥� around window heads and leaving the complete window exposed to view.
• Where piping cannot be easily concealed by providing alternative routes through less significant spaces, provide gypsum board enclosures of the minimum size necessary to sufficiently conceal the pipes.
• Preserve ornamental walls and ceilings as much as possible. Avoid penetrating or attaching to ornamental finishes.
• Where possible, place pipes, conduit, etc. along recessed ledges or other areas of minimal visibility.
• Where possible use piping of minimum diameter for purposes specified.
• Paint pipes, conduit, etc. where possible to blend with adjacent finishes.
• Where possible, use decoration patterns to disguise new placement of wiring or systems.
• Conceal ductwork in unused closets when possible and provide adequate ventilation.
• Use an air-sampling system instead of a smoke detector when possible; only a small hole in the ceiling is required and very little space in the ceiling is required for the pipe.
• Conceal sprinkler heads and smoke detectors in decorative ,plaster ceilings.
• Use unused fireplaces for return air ducts.
• Use permanently placed furniture to disguise ductwork.

Grilles:

• Reuse original hardware, such as grilles, etc. where possible.
• Specify new grilles, light fixtures, etc. to match original as closely as possible, in material and pattern.
• If reuse of an existing grille is not possible, leave original grille in place and locate new grille within five feet of original location - preferably on a non-ornamental surface such as flat plaster.

Light Fixtures:

• Rewire, clean and refinish original fixtures when possible.
• NEVER attach fluorescent fixtures directly to ceiling medallions.
• Conceal the light source when installing indirect lighting.
• Introduce as few new fixtures and holes in the ceiling as possible.
• Provide emergency lighting that is as unobtrusive as possible; use a small fixture if possible; make sure the battery pack is concealed.
• Conceal ambient lighting behind ceiling moldings when possible.

Switches

• Conceal Conduit For Light Switches, Fire Alarms And Other Controls Behind Decorative Surfaces If Possible Rather Than Attaching It Onto The Surfaces.
• Paint Switch Plates And Access Panels Separately So They Can Be Easily Removed.
• Conceal Fire Alarm Equipment Behind Unused Heating Grilles.
• Use Wireless Fire Alarm Systems When Possible To Eliminate Unsightly Conduit And Wiring.
• Conceal Electrical Panelboards In Unused Closets When Possible And Provide Adequate Ventilation
• Conceal Smoke Detectors In Decorative Plaster Ceilings.