MECHANICAL STANDARDS (continued - page 2 of 2)

Directives, Standards, and NPS Guidelines

Mechanical Drawing Preparation Standards

• See Drafting Standards

Professional Guidance

• HVAC
• Outdoor Design Conditions: 2001 ASHRAE "Handbook of Fundamentals", Chapter 27 (Climatic Design Information)
• Building Material Thermal Properties: 2001 ASHRAE "Handbook
  of Fundamentals", Chapter 25 (Thermal and Water Vapor Transmission Data)
• Indoor Design Conditions for Public, Office, and Living Spaces:
• Winter: 72 degrees F
• Summer: 75 degrees F
• Maximum Relative Humidity: 60%
• Indoor Design Conditions for Shop and Storage Spaces:
• Winter: 65 degrees F
• Summer: 80 degrees F
• General Ventilation: In accordance with ASHRAE 62.
• Restroom Ventilation: Minimum 2 CFM per square foot of floor area.
• Acoustical Criteria (maximum values):
• Auditoriums and Exhibit Spaces: NC25
• Office Spaces: NC35
• Shop Spaces: NC45
• Refrigerant Bearing Equipment: All refrigerant bearing equipment shall be CFC-free.



• Plumbing



• Domestic Water Heating: 1999 ASHRAE "Handbook of Applications", Chapter 48 (Service Water Heating)
• Compressed Air Systems: 1988 CAGI "Compressed Air and
  Gas Handbook"
• Plumbing Fixtures: All plumbing fixtures and fittings shall be
  low-flow water conserving types, conforming to 1992 Energy Policy
  Act requirements.
• Backflow Prevention: Comply with each park's backflow prevention regulations. As minimums, provide double check valve assemblies on all fire services or other water service connections that may produce objectionable backflow and reduced pressure zone backflow assemblies on all makeup water connections to HVAC equipment or other water service connections that may produce hazardous backflow.
• Metering: All domestic water, reclaimed water, and fuel gas services
  to each building shall be metered in accordance with NPS Staff Directive 78-10.
• Water Pressure: Pressure reducing valves shall be provided as necessary to limit water pressure in buildings to 80 psig maximum. Booster pumps shall be provided as necessary to maintain a minimum of 25 psig at the furthest plumbing fixture at design flowrate conditions.

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