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ASHRAE Standard 170 Ventilation of Health Care Facilities (ANSI/ASHRAE/ASHE Approved), 2008
- 170_2008.pdf [Go to Page]
- FOREWORD
- 1. PURPOSE
- 2. SCOPE
- 2.1 The requirements in this standard apply to patient care areas and related support areas within health care facilities, including hospitals, nursing facilities, and outpatient facilities.
- 2.2 This standard applies to new buildings, additions to existing buildings, and those alterations to existing buildings that are identified within this standard.
- 2.3 This standard considers chemical, physical, and biological contaminants that can affect the delivery of medical care to patients; the convalescence of patients; and the safety of patients, health care workers, and visitors.
- 3. DEFINITIONS
- 4. COMPLIANCE
- 4.1 Compliance Requirements
- 4.2 Administrative Requirements. Administrative requirements relating to permit requirements, enforcement by the authority having jurisdiction, interpretations, claims of exemption, approved calculation methods, rights of approved calculation methods...
- 4.3 Compliance Documents
- 4.4 Alternate Materials, Methods of Construction, or Design. The provisions of this standard are not intended to prevent the use of any material, method of construction, design, or building system not specifically prescribed herein, provided such con...
- 4.5 Informative Appendices. The informative appendices to this standard and informative notes located within this standard contain recommendations, explanations, and other non- mandatory information and are not part of this standard.
- 4.6 Criteria Ranges. This standard often specifies a range of values that will comply with a specific requirement of the standard. If it is permitted by the authority having jurisdiction, compliance with this requirement may be achieved by the presen...
- 5. PLANNING
- 6. SYSTEMS AND EQUIPMENT
- 6.1 Utilities
- 6.2 Air-Handling Unit Design
- 6.3 Outdoor Air Intakes and Exhaust Discharges
- 6.4 Filtration. Filter banks shall be provided in accordance with Table 6-1. Each filter bank with an efficiency of greater than MERV 12 shall be provided with an installed manometer or differential pressure measuring device that is readily accessibl...
- 6.5 Heating and Cooling Systems
- 6.6 Humidifiers. When outdoor humidity and internal moisture sources are not sufficient to meet the requirements of Table 7-1, humidification shall be provided by means of the health-care facility air-handling systems. Locate humidifiers within air-h...
- 6.7 Air Distribution Systems
- 7. SPACE VENTILATION
- 7.1 General Requirements. The following general requirements shall apply for space ventilation:
- 7.2 Additional Room Specific Requirements
- 7.3 Critical Care Units
- 7.4 Surgery Rooms
- 7.5 Support Spaces
- 8. PLANNING, CONSTRUCTION, AND SYSTEM STARTUP
- 8.1 Overview. For HVAC systems serving surgery and critical care spaces, compliance with this standard requires preparation of an acceptance testing plan.
- 8.2 Planning for the HVAC Services in a New Facility. Design documents for new construction shall meet the following requirements:
- 8.3 Planning for the HVAC Services in an Existing Facility. If any existing air-handling equipment is reused, the designer shall evaluate the capacity of the equipment to determine whether it will meet the requirements of this standard for the remode...
- 8.4 Planning for Infection Control During Remodeling of an Existing Facility. Prior to beginning modifications or remodeling of HVAC systems in an existing facility, an owner shall conduct an infection control risk assessment (ICRA). The ICRA shall e...
- 8.5 Documentation of New or Remodeled HVAC Systems. Owners shall retain an acceptance testing report for their files. In addition, the design shall include requirements for operations and maintenance staff training that is sufficient for the staff to...
- 8.6 Duct Cleanliness. The duct supply system shall meet the following requirements for cleanliness:
- 9. NORMATIVE REFERENCES
- INFORMATIVE ANNEX A
- A1. O&M in Health Care Facilities
- A1.1 Operating Rooms. Each operating room should be tested for positive pressure semi-annually or on an effective preventative maintenance schedule. When HEPA filters are present within the diffuser of operating rooms, the filter should be replaced b...
- A1.2 Protective Environment (PE) Rooms. PE rooms should remain under positive pressure with respect to all adjoining rooms whenever an immunocompromised patient is present. PE rooms should be tested for positive pressure daily when an immunocompromis...
- A1.3 Airborne Infection Isolation (AII) Rooms. AII rooms should remain under negative pressure relative to all adjoining rooms whenever an infectious patient is present. They should be tested for negative pressure daily whenever an infectious patient...
- A1.4 Filters. Final filters and filter frames should be visually inspected for pressure drop and for bypass monthly. Filters should be replaced based on pressure drop with filters that provide the efficiencies specified in Table 6-1.
- A2. Special Maintenance for HVAC Units
- A2.1 Fan-Coil Unit and Heat Pumps. The fan-coil unit and heat pump filters serving patient rooms should be inspected monthly or on an effective preventative maintenance cycle for pressure drop and replaced when that pressure drop causes a reduction i...
- A2.2 Fin-Tube Radiation Units, Induction Units and Convection Units. Fin-tube radiation units, induction units and convection units serving patient rooms should be cleaned quarterly, or on an effective preventative maintenance cycle.
- A2.3 Fan-Powered Terminal Units. Fan-powered terminal unit filters serving patient rooms should be inspected monthly or on an effective preventative maintenance cycle for pressure drop and replaced when the pressure drop causes a reduction in air flow.
- INFORMATIVE ANNEX B BIBLIOGRAPHY [Go to Page]