D. Emergency ventilation in case of loss of electrical power to HVAC system
(when HVAC system is not on emergency power system)
3.5.5.2 Make design decisions on operability in close consultation with the
medical center, specifically addressing all the factors above. Operable
windows shall be in-swinging and side-hinged unless historic design
compatibility or other specific conditions dictate otherwise. All operable
windows in air-conditioned buildings shall normally be closed and locked.
For safety, operable windows in patient bedrooms shall have hold-open
hardware which secures the window at a maximum opening of 150 mm (6 in.) for
emergency ventilation.
3.5.5.3 When in open position for ventilation, window sash shall not project
into the room beyond edge of stool or face of convector, nor beyond exterior
reveals of window sills within 2000 mm (6 ft. 6 in.) of grade.
3.5.5.4 Mechanically operated windows shall be avoided. If they are necessary
for high or inaccessible windows, then the mechanical operators shall be
simple and durable.
3.5.6 SAFETY GLAZING
3.5.6.1 Glaze all windows in Psychiatric Nursing Units, Alcohol Dependency
Treatment Nursing Units, Drug Abuse Treatment Nursing Units, Medical,
Surgical and Neurological (MS&N) Security Bedrooms, Security Exam Rooms, and
Security Holding Rooms with laminated glass. Laminated glass shall be 11 mm
(7/l6 in.) thick in locked patient units and security rooms, 8 mm (5/l6 in.)
thick elsewhere.
3.5.6.2 If laminated glass is required for double-glazed windows, provide it
for interior panes only except in Mental Health and Behavioral Nursing Units
for windows facing a courtyard with sill/stools less than 2000 mm (6 ft. 6
in.) above the ground. Where this occurs, laminated glass is required for
both panes.
3.6 SCREENS
3.6.1 WINDOW SCREENS
3.6.1.1 INSECT SCREENS
Provide screens only on operable windows in spaces that are not air
conditioned.
3.6.1.2 DETENTION SCREENS
Use detention screens only in existing buildings where limitations of
architectural character or cost do not permit replacement of existing
screened windows whose design will not accommodate laminated safety glass.
3.6.1.3 SECURITY SCREENS
Provide security screens on windows where required by Design and Construction
Procedures, Chapter 14, "Security".
3.6.2 VENTILATION SYSTEM SCREENS
Provide bird screens on mechanical ventilation supply and exhaust openings in
exterior walls. Provide insect screens on the inside of louvered openings in
exterior walls where there are no duct connections.
ARCHITECTURAL DESIGN MANUAL
3-6
BUILDING ENVELOPE
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