UFGS Changes and Revisions 
Related Materials: Policy on UFGS Changes and Revisions
Below is a listing of the Revisions and Changes made to UFGS Sections for each quarterly release.
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To view the complete detailed history of all the revisions and changes made to a UFGS Section, click on the Section title.
| KEY | PREPARING ACTIVITY (PA) | A Army | N Navy | F Air Force | S NASA |
|---|---|---|---|---|---|
| ACTION | N New | R Revision | C Change | D Deletion |
| Release | PA |
UFGS Section |
Date | Action | Change # | Nature of Change or Revision |
|---|---|---|---|---|---|---|
| Aug-2018 | N | UFGS 23 81 00.00 20 Unitary Air Conditioning Equipment | Nov-2009 | C | 4 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Jul-2006 | N | UFGS 23 81 00.00 20 Unitary Air Conditioning Equipment | Jul-2006 | R | Added sustainable design requirements | |
| Nov-2019 | N | UFGS 23 81 00.00 20 Unitary Air Conditioning Equipment | Nov-2009 | C | 5 | Incorporated dispersal of criteria from the retired UFC 3-440-05N TROPICAL ENGINEERING, and the addition of corrosion protection criteria to coordinate with UFC 1-200-01 DoD BUILDING CODE. |
| Aug-2020 | N | UFGS 23 81 00.00 20 Unitary Air Conditioning Equipment | Nov-2009 | D | Superseded by UFGS 23 81 00 DECENTRALIZED UNITARY HVAC EQUIPMENT Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| May-2018 | A | UFGS 23 81 00 Decentralized Unitary HVAC Equipment | May-2018 | N | Superseding UFGS 23 82 02.00 10 UNITARY HEATING AND COOLING EQUIPMENT. Complete review and update including section number and title changes. | |
| Feb-2021 | A | UFGS 23 81 00 Decentralized Unitary HVAC Equipment | May-2018 | C | 1 | Deleted contents of paragraph 2.3.4 and added note. |
| May-2020 | A | UFGS 23 80 20.00 10 Gas-Fired Heating Equipment | May-2020 | N | Superseding UFGS 23 54 16.00 10 HEATING SYSTEM; GAS-FIRED HEATERS without revision to comply with MF 2011 in response to CCR 2032. Nontechnical number and title change. | |
| Aug-2015 | N | UFGS 23 76 00.00 20 Evaporative Cooling System | Jul-2006 | C | 1 | UFGS sustainability/energy updates to comply with Navy and DoD policies to enforce requirements of UFC 1-200-02 "High Performance and Sustainable Building Requirements". |
| Aug-2018 | N | UFGS 23 76 00.00 20 Evaporative Cooling System | Jul-2006 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Jul-2006 | N | UFGS 23 76 00.00 20 Evaporative Cooling System | Jul-2006 | R | Added sustainable design requirements | |
| Aug-2021 | N | UFGS 23 76 00.00 20 Evaporative Cooling System | Jul-2006 | D | Superseded by new unified UFGS 23 76 00 EVAPORATIVE COOLING SYSTEMS. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jan-2008 | A | UFGS 23 76 00.00 10 Evaporative Cooling Systems | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Apr-2008 | A | UFGS 23 76 00.00 10 Evaporative Cooling Systems | Apr-2008 | R | Compliance with CSI SectionFormat | |
| Aug-2021 | A | UFGS 23 76 00.00 10 Evaporative Cooling Systems | Apr-2008 | D | Superseded by new unified UFGS 23 76 00 EVAPORATIVE COOLING SYSTEMS. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Aug-2021 | N | UFGS 23 76 00 Evaporative Cooling Systems | Aug-2021 | N | New unified section; supersedes UFGS 23 76 00.00 10 EVAPORATIVE COOLING SYSTEMS and UFGS 23 76 00.00 20 EVAPORATIVE COOLING SYSTEM. | |
| Feb-2020 | N | UFGS 23 75 15 Custom-Packaged, Aircraft Pre-Conditioned Air Units | Feb-2020 | N | New specification covering the requirements for high-pressure, preconditioned air units, ductwork and controls for aircraft cooling systems in conjunction with UFC 4-211-01, Aircraft Maintenance Hangars. | |
| May-2017 | S | UFGS 23 74 33.00 40 Small HVAC Units, Cooling-Only, Recirculating, Split and Unitary for Window and Floor Mounting | May-2017 | R | Tri-Annual Database Maintenance (TADM) completed | |
| Apr-2008 | S | UFGS 23 74 33.00 40 Small HVAC Units, Cooling-Only, Recirculating, Split and Unitary for Window and Floor Mounting | Apr-2008 | R | Section References (SRF) update | |
| Aug-2008 | S | UFGS 23 74 33.00 40 Small HVAC Units, Cooling-Only, Recirculating, Split and Unitary for Window and Floor Mounting | Apr-2008 | D | Renumbered/ Superseded by UFGS 23 74 33 with same title | |
| Feb-2011 | S | UFGS 23 74 33.00 40 Small HVAC Units, Cooling-Only, Recirculating, Split and Unitary for Window and Floor Mounting | Feb-2011 | N | Renumbered to NASA fifth level; Superseding UFGS 23 74 33 with no title change | |
| Apr-2007 | S | UFGS 23 74 33.00 40 Small HVAC Units, Cooling-Only, Recirculating, Split and Unitary for Window and Floor Mounting | Apr-2007 | R | Reference Update | |
| Jun-2006 | S | UFGS 23 74 33.00 40 Small HVAC Units, Cooling-Only, Recirculating, Split and Unitary for Window and Floor Mounting | Jun-2006 | R | Title changed from PACKAGED AIR-CONDITIONING UNITS; Reference and Section References (SRF) updated | |
| Nov-2009 | S | UFGS 23 74 33 Packaged, Outdoor, Heating and Cooling Makeup Air-Conditioners | Nov-2009 | R | General update of section | |
| Aug-2008 | S | UFGS 23 74 33 Packaged, Outdoor, Heating and Cooling Makeup Air-Conditioners | Aug-2008 | N | Renumbered; Superseding UFGS 23 74 33.00 40 with same title; Minor Edits; Section References (SRF) update | |
| Feb-2011 | S | UFGS 23 74 33 Packaged, Outdoor, Heating and Cooling Makeup Air-Conditioners | Nov-2009 | D | NASA reclassified this as fifth level; Renumbered/ Superseded by UFGS 23 74 33.00 40 with same title Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jan-2007 | S | UFGS 23 73 33.00 40 Indoor Indirect Fuel-Fired Heating and Ventilating Units | Jun-2006 | D | Information already provided in UFGS 23 82 01.00 10 Warm Air Heating Systems Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jun-2006 | S | UFGS 23 73 33.00 40 Indoor Indirect Fuel-Fired Heating and Ventilating Units | Jun-2006 | R | Title changed from HEATING/VENTILATION/AIR CONDITIONING SYSTEMS; Reference and Section References (SRF) updated | |
| May-2017 | S | UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units | May-2017 | R | Tri-Annual Database Maintenance (TADM) completed | |
| Apr-2008 | S | UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units | Apr-2008 | R | Section References (SRF) update | |
| May-2014 | S | UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units | May-2014 | R | Tri-Annual Database Maintenance (TADM) completed | |
| Aug-2008 | S | UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units | Apr-2008 | D | Renumbered/ Superseded by UFGS 23 73 13 with same title | |
| Feb-2011 | S | UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units | Feb-2011 | N | Renumbered to NASA fifth level; Superseding UFGS 22 14 29 with no title change; CCR #604 comments have been incorporated | |
| Jul-2007 | S | UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units | Jul-2007 | R | Section References (SRF) update | |
| Jun-2006 | S | UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units | Jun-2006 | N | New - Superseding UFGS 23 73 00.13 40 Modular Indoor Central-Station Air-Handling Units | |
| Aug-2010 | S | UFGS 23 73 13 Modular Indoor Central-Station Air-Handling Units | Aug-2010 | R | Revised General Note, deleted 1.2; submittal article compliance; Added subparts 1.3. 1.3.1, 1.3.2, 1.4, 1.5, 2.1and 3.8; other minor revisions throughout | |
| Aug-2008 | S | UFGS 23 73 13 Modular Indoor Central-Station Air-Handling Units | Aug-2008 | N | Renumbered; Superseding UFGS 23 73 13.00 40 with same title; Minor Edits; Section References (SRF) update | |
| Nov-2008 | S | UFGS 23 73 13 Modular Indoor Central-Station Air-Handling Units | Nov-2008 | R | Section References (SRF) update | |
| Feb-2011 | S | UFGS 23 73 13 Modular Indoor Central-Station Air-Handling Units | Aug-2010 | D | NASA reclassified this as fifth level; Renumbered/ Superseded by UFGS 23 73 13.00 40 with same title and CCR #604 comments incorporated Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jul-2006 | S | UFGS 23 73 00.13 40 Modular Indoor Central-Station Air-Handling Units | Apr-2006 | D | Superseded by UFGS 23 73 13.00 40 Modular Indoor Central-Station Air-Handling Units Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jan-2007 | S | UFGS 23 73 00.00 40 Indoor Central-Station Air-Handling Units | Jun-2006 | D | Information already provided in UFGS 23 34 16.00 20 Air Handling Units Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jun-2006 | S | UFGS 23 73 00.00 40 Indoor Central-Station Air-Handling Units | Jun-2006 | R | Title changed from AIR HANDLING; Reference and Section References (SRF) updated | |
| Feb-2018 | A | UFGS 23 72 26.00 10 Desiccant Cooling Systems | Apr-2008 | D | Superseded by UFGS 23 84 19.00 DESICCANT COOLING SYSTEMS. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jan-2008 | A | UFGS 23 72 26.00 10 Desiccant Cooling Systems | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Apr-2008 | A | UFGS 23 72 26.00 10 Desiccant Cooling Systems | Apr-2008 | R | Compliance with CSI SectionFormat | |
| Jul-2006 | A | UFGS 23 72 26.00 10 Desiccant Cooling Systems | Jul-2006 | N | New - Superseding UFGS 42 31 16.00 10 Desiccant Cooling Systems | |
| Jan-2008 | A | UFGS 23 72 00.00 10 Energy Recovery Systems | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Oct-2007 | A | UFGS 23 72 00.00 10 Energy Recovery Systems | Oct-2007 | R | Updated seismic criteria | |
| May-2018 | A | UFGS 23 71 19 Thermal Energy Storage System: Ice-On-Coil | May-2018 | R | Complete review and update. | |
| Jan-2008 | A | UFGS 23 71 19 Thermal Energy Storage System: Ice-On-Coil | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Aug-2015 | A | UFGS 23 71 19 Thermal Energy Storage System: Ice-On-Coil | Jan-2008 | C | 1 | UFGS sustainability/energy updates to comply with Navy and DoD policies to enforce requirements of UFC 1-200-02 "High Performance and Sustainable Building Requirements". |
| Jul-2007 | A | UFGS 23 71 19 Thermal Energy Storage System: Ice-On-Coil | Jul-2007 | R | Div 05 Section References (SRF) changes | |
| Jan-2008 | A | UFGS 23 70 03.00 10 Heating and Utilities Systems, Central Steam | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Oct-2007 | A | UFGS 23 70 03.00 10 Heating and Utilities Systems, Central Steam | Oct-2007 | R | Updated seismic criteria | |
| May-2020 | A | UFGS 23 70 03.00 10 Heating and Utilities Systems, Central Steam | Jan-2008 | D | Superseded by UFGS 23 58 00.00 10 CENTRAL STEAM HEATING AND UTILITIES SYSTEMS without revision to comply with MF 2011 in response to CCR 2036. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Aug-2017 | A | UFGS 23 70 02.00 10 Central Steam Generating System - Combination Gas and Oil Fired | Jan-2008 | C | 1 | Changed Material Safety Data Sheets (MSDS) to Safety Data Sheets (SDS). |
| Jan-2008 | A | UFGS 23 70 02.00 10 Central Steam Generating System - Combination Gas and Oil Fired | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Oct-2007 | A | UFGS 23 70 02.00 10 Central Steam Generating System - Combination Gas and Oil Fired | Oct-2007 | R | Updated seismic criteria | |
| May-2020 | A | UFGS 23 70 02.00 10 Central Steam Generating System - Combination Gas and Oil Fired | Jan-2008 | D | Superseded by UFGS 23 52 30.02 10 CENTRAL STEAM GENERATING SYSTEM - COMBINATION GAS AND OIL FIRED without revision to comply with MF 2011 in response to CCR 2035. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Aug-2017 | A | UFGS 23 70 01.00 10 Central Steam-Generating System, Coal-Fired | Jan-2008 | C | 1 | Changed Material Safety Data Sheets (MSDS) to Safety Data Sheets (SDS). |
| Jan-2008 | A | UFGS 23 70 01.00 10 Central Steam-Generating System, Coal-Fired | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Oct-2007 | A | UFGS 23 70 01.00 10 Central Steam-Generating System, Coal-Fired | Oct-2007 | R | Updated seismic criteria | |
| May-2020 | A | UFGS 23 70 01.00 10 Central Steam-Generating System, Coal-Fired | Jan-2008 | D | Superseded by UFGS 23 52 30.01 10 CENTRAL COAL-FIRED STEAM-GENERATING SYSTEM without revision to comply with MF 2011 in response to CCR 2034. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Aug-2015 | N | UFGS 23 69 00.00 20 Refrigeration Equipment for Cold Storage | Jul-2006 | C | 1 | UFGS sustainability/energy updates to comply with Navy and DoD policies to enforce requirements of UFC 1-200-02 "High Performance and Sustainable Building Requirements". |
| Aug-2018 | N | UFGS 23 69 00.00 20 Refrigeration Equipment for Cold Storage | Jul-2006 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Jul-2006 | N | UFGS 23 69 00.00 20 Refrigeration Equipment for Cold Storage | Jul-2006 | R | Added sustainable design requirements | |
| Aug-2008 | N | UFGS 23 66 00.00 20 Central Refrigeration Equipment for Air Conditioning | Jul-2006 | D | Superseded by UFGS 23 64 00 Packaged Water Chillers, Absorption Type and UFGS 23 64 10 Water Chillers, Vapor Compression Type, and UFGS 23 65 00 Cooling Towers | |
| Jul-2006 | N | UFGS 23 66 00.00 20 Central Refrigeration Equipment for Air Conditioning | Jul-2006 | R | Added sustainable design requirements | |
| Jan-2008 | A | UFGS 23 65 00.00 10 Cooling Tower | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Aug-2008 | A | UFGS 23 65 00.00 10 Cooling Tower | Jan-2008 | D | Superseded by UFGS 23 65 00 Cooling Towers | |
| Aug-2017 | N | UFGS 23 65 00 Cooling Towers and Remote Evaporatively-Cooled Condensers | Nov-2016 | C | 1 | Updated to coordinate archiving of Section 23 09 23.13 20 BACnet Direct Digital Control Systems for HVAC to meet the requirement of 10 USC 2867 to adopt a “Department wide, Open Protocol, Energy Monitoring and Utility Control System Specification” for use in military construction and military family housing activities. |
| Aug-2008 | N | UFGS 23 65 00 Cooling Towers and Remote Evaporatively-Cooled Condensers | Aug-2008 | N | Superseding UFGS 23 65 00.00 10 Cooling Tower and UFGS 23 66 00.00 20 Central Refrigeration Equipment for Air Conditioning | |
| Nov-2016 | N | UFGS 23 65 00 Cooling Towers and Remote Evaporatively-Cooled Condensers | Nov-2016 | R | Title changed from Cooling Towers; Complete review and update concerning cooling towers and remote evaporatively cooled condensers. | |
| Aug-2015 | N | UFGS 23 65 00 Cooling Towers and Remote Evaporatively-Cooled Condensers | Aug-2008 | C | 1 | UFGS sustainability/energy updates to comply with Navy and DoD policies to enforce requirements of UFC 1-200-02 "High Performance and Sustainable Building Requirements". |
| Aug-2018 | N | UFGS 23 65 00 Cooling Towers and Remote Evaporatively-Cooled Condensers | Nov-2016 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Feb-2017 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | C | 4 | Updated Technical Note in 2.2.2-Fittings and End Connections (Joints) |
| Aug-2009 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | R | Editorial changes to subparts 2.3 & 2.4 | |
| Apr-2008 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Apr-2008 | R | Section References (SRF) update paragraph 2.12 | |
| Nov-2013 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | C | 1 | Added subparts 2.3 and 3.2; revised subparts 2.2.2.2, 2.4.1, 2.7.13. 2.7.16, 2.8.5, 2.17.5.1 and 3.5.2 |
| Aug-2015 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | C | 3 | UFGS sustainability/energy updates to comply with Navy and DoD policies to enforce requirements of UFC 1-200-02 "High Performance and Sustainable Building Requirements". |
| May-2015 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | C | 2 | Modified subparts 2.2.2, 2.2.2.4, 2.6.3, and 3.1.4.4 to show grooved connections are not used on NAVFAC projects. |
| Jan-2007 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Jan-2007 | R | Added note "Not for use in Navy projects" to paragraphs 'Piping for Steam and Condensate' (2.3) and 'Piping for High-Pressure Compressed-Air Systems' (2.4) | |
| Jul-2006 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Jul-2006 | R | Added NASA requirements | |
| Nov-2019 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | C | 5 | Incorporated dispersal of criteria from the retired UFC 3-440-05N TROPICAL ENGINEERING, and the addition of corrosion protection criteria to coordinate with UFC 1-200-01 DoD BUILDING CODE. |
| Nov-2022 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | C | 6 | Updated paragraph "Valves" (3.1.5) removed sentence regarding omitting isolation valves |
| Feb-2024 | N | UFGS 23 64 26 Chilled, Chilled-Hot, and Condenser Water Piping Systems | Aug-2009 | C | 7 | In response to CCRs 9060, 13651, and 14220, ‘Pump Discharge Valve’ (submittal and paragraph) has been removed from the section as it conflicted with UFC 3-410-01 Heating, Ventilating, and Air Conditioning Systems’. |
| Aug-2017 | N | UFGS 23 64 10 Water Chillers, Vapor Compression Type | Nov-2016 | C | 1 | Updated to coordinate archiving of Section 23 09 23.13 20 BACnet Direct Digital Control Systems for HVAC to meet the requirement of 10 USC 2867 to adopt a “Department wide, Open Protocol, Energy Monitoring and Utility Control System Specification” for use in military construction and military family housing activities. |
| Nov-2014 | N | UFGS 23 64 10 Water Chillers, Vapor Compression Type | Aug-2008 | C | 2 | Updated Products Section for chillers in Part 2. |
| Nov-2013 | N | UFGS 23 64 10 Water Chillers, Vapor Compression Type | Aug-2008 | C | 1 | Added subparts 2.3 and 3.2; revised subparts 2.2.2.2, 2.4.1, 2.7.13. 2.7.16, 2.8.5, 2.17.5.1 and 3.5.2 |
| Aug-2008 | N | UFGS 23 64 10 Water Chillers, Vapor Compression Type | Aug-2008 | N | Superseding UFGS 23 64 00.00 10 Liquid Chillers and UFGS 23 66 00.00 20 Central Refrigeration Equipment for Air Conditioning | |
| Nov-2016 | N | UFGS 23 64 10 Water Chillers, Vapor Compression Type | Nov-2016 | R | Complete revision. | |
| Aug-2015 | N | UFGS 23 64 10 Water Chillers, Vapor Compression Type | Aug-2008 | C | 3 | UFGS sustainability/energy updates to comply with Navy and DoD policies to enforce requirements of UFC 1-200-02 "High Performance and Sustainable Building Requirements". |
| Aug-2018 | N | UFGS 23 64 10 Water Chillers, Vapor Compression Type | Nov-2016 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Jan-2008 | A | UFGS 23 64 00.00 10 Liquid Chillers | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Aug-2008 | A | UFGS 23 64 00.00 10 Liquid Chillers | Jan-2008 | D | Superseded by UFGS 23 64 00 Packaged Water Chillers, Absorption Type and UFGS 23 64 10 Water Chillers, Vapor Compression Type | |
| Oct-2007 | A | UFGS 23 64 00.00 10 Liquid Chillers | Oct-2007 | R | Revised in response to CCR 1585 | |
| Jul-2006 | A | UFGS 23 64 00.00 10 Liquid Chillers | Jul-2006 | N | New - Superseding UFGS 42 22 00.00 10 Liquid Chillers | |
| Aug-2017 | N | UFGS 23 64 00 Packaged Water Chillers, Absorption Type | Nov-2016 | C | 1 | Updated to coordinate archiving of Section 23 09 23.13 20 BACnet Direct Digital Control Systems for HVAC to meet the requirement of 10 USC 2867 to adopt a “Department wide, Open Protocol, Energy Monitoring and Utility Control System Specification” for use in military construction and military family housing activities. |
| Aug-2009 | N | UFGS 23 64 00 Packaged Water Chillers, Absorption Type | Aug-2009 | R | Deleted para. 2.5.5 | |
| Aug-2008 | N | UFGS 23 64 00 Packaged Water Chillers, Absorption Type | Aug-2008 | N | Superseding UFGS 23 64 00.00 10 Liquid Chillers and UFGS 23 66 00.00 20 Central Refrigeration Equipment for Air Conditioning | |
| Nov-2016 | N | UFGS 23 64 00 Packaged Water Chillers, Absorption Type | Nov-2016 | R | Complete revision. |
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