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-2015 | N | UFGS 23 52 46.00 20 Low Pressure Water Heating Boilers (Over 800,000 BTU/HR Output) | May-2015 | 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". |
| May-2015 | N | UFGS 23 52 46.00 20 Low Pressure Water Heating Boilers (Over 800,000 BTU/HR Output) | May-2015 | R | Revised throughout to incorporate CCRs 1007 and 4266. Modifications included references, boiler installation requirements, detail drawings, water analysis, safety standards, submittals, controls, safety features, operational tests, and acceptance operational test and inspection. | |
| Aug-2018 | N | UFGS 23 52 46.00 20 Low Pressure Water Heating Boilers (Over 800,000 BTU/HR Output) | May-2015 | C | 3 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Nov-2008 | N | UFGS 23 52 49.00 20 Steam Boilers and Equipment (500,000 - 18,000,000 BTU/HR) | Nov-2008 | R | Section References (SRF) update | |
| Aug-2015 | N | UFGS 23 52 49.00 20 Steam Boilers and Equipment (500,000 - 18,000,000 BTU/HR) | Nov-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 52 49.00 20 Steam Boilers and Equipment (500,000 - 18,000,000 BTU/HR) | Nov-2008 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Aug-2015 | N | UFGS 23 52 53.00 20 Steam Boilers and Equipment (18,000,000 - 60,000,000 BTU/HR) | Apr-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 52 53.00 20 Steam Boilers and Equipment (18,000,000 - 60,000,000 BTU/HR) | Apr-2006 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Apr-2006 | N | UFGS 23 52 53.00 20 Steam Boilers and Equipment (18,000,000 - 60,000,000 BTU/HR) | Apr-2006 | R | To conform with CSI MasterFormat, replacing without change UFGS-15517N (June 2005) | |
| Jan-2008 | A | UFGS 23 54 16.00 10 Heating System; Gas-Fired Heaters | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Apr-2008 | A | UFGS 23 54 16.00 10 Heating System; Gas-Fired Heaters | Apr-2008 | R | Compliance with CSI SectionFormat | |
| Oct-2007 | A | UFGS 23 54 16.00 10 Heating System; Gas-Fired Heaters | Oct-2007 | R | Updated seismic criteria | |
| Feb-2020 | A | UFGS 23 54 16.00 10 Heating System; Gas-Fired Heaters | Apr-2008 | C | 1 | Updated paragraph 2.1.1 in response to CCR 3988. |
| May-2020 | A | UFGS 23 54 16.00 10 Heating System; Gas-Fired Heaters | Apr-2008 | D | Superseded by UFGS 23 80 20.00 10 GAS-FIRED HEATING EQUIPMENT without revision to comply with MF 2011 in response to CCR 2032. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Nov-2008 | N | UFGS 23 54 19 Building Heating Systems, Warm Air | Nov-2008 | R | Section References (SRF) update | |
| Aug-2015 | N | UFGS 23 54 19 Building Heating Systems, Warm Air | Nov-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 54 19 Building Heating Systems, Warm Air | Nov-2008 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Aug-2021 | N | UFGS 23 54 19 Building Heating Systems, Warm Air | Aug-2021 | R | Complete revision; supersedes UFGS 23 82 01.00 10 WARM AIR HEATING SYSTEMS | |
| Aug-2008 | S | UFGS 23 55 13.00 40 Fuel-Fired Duct Heaters | Jan-2007 | D | Superseded by UFGS 23 82 43 Electric Duct Heaters | |
| Jan-2007 | S | UFGS 23 55 13.00 40 Fuel-Fired Duct Heaters | Jan-2007 | R | Section References (SRF) update | |
| Jun-2006 | S | UFGS 23 55 13.00 40 Fuel-Fired Duct Heaters | Jun-2006 | R | Title changed from DUCT HEATERS; Section References (SRF) updated | |
| Jan-2008 | A | UFGS 23 57 10.00 10 Forced Hot Water Heating Systems Using Water and Steam Heat Exchangers | Jan-2008 | R | Incorporated EPAct05 requirements | |
| Oct-2007 | A | UFGS 23 57 10.00 10 Forced Hot Water Heating Systems Using Water and Steam Heat Exchangers | Oct-2007 | R | Updated seismic criteria | |
| Nov-2019 | A | UFGS 23 57 10.00 10 Forced Hot Water Heating Systems Using Water and Steam Heat Exchangers | Nov-2019 | R | Complete review and update. | |
| May-2020 | A | UFGS 23 58 00.00 10 Central Steam Heating and Utilities Systems | May-2020 | N | Superseding UFGS 23 70 03.00 10 HEATING AND UTILITIES SYSTEMS, CENTRAL STEAM without revision to comply with MF 2011 in response to CCR 2036. Nontechnical number and title change. | |
| Jan-2007 | S | UFGS 23 61 00.00 40 Refrigerant Compressors | Jun-2006 | D | Information already provided in the following sections: UFGS 23 63 00.00 10 Cold Storage Refrigeration Systems, 23 66 00.00 20 Central Refrigeration Equipment For Air Conditioning, 23 69 00.00 20 Refrigeration Equipment For Cold Storage, and 23 82 02.00 10 Unitary Heating Cooling Equipment Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Jun-2006 | S | UFGS 23 61 00.00 40 Refrigerant Compressors | Jun-2006 | R | Title changed from REFRIGERATION COMPRESSORS; Reference and Section References (SRF) updated | |
| Oct-2007 | A | UFGS 23 63 00.00 10 Cold Storage Refrigeration Systems | Oct-2007 | R | Revised in response to CCR 1590 | |
| Aug-2022 | A | UFGS 23 63 00.00 10 Cold Storage Refrigeration Systems | Oct-2007 | D | Superseded by unified UFGS 23 63 00.00 COLD STORAGE REFRIGERATION SYSTEMS. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| Aug-2022 | A | UFGS 23 63 00.00 Cold Storage Refrigeration Systems | Aug-2022 | N | Superseding UFGS 23 63 00.00 10 COLD STORAGE REFRIGERATION SYSTEMS. | |
| 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. | |
| Aug-2015 | N | UFGS 23 64 00 Packaged Water Chillers, Absorption Type | Aug-2009 | 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 64 00 Packaged Water Chillers, Absorption Type | Nov-2016 | C | 2 | Sustainability updates required to coordinate with the Federal Codes and DoD policies and procedures. |
| Nov-2023 | N | UFGS 23 64 00 Packaged Water Chillers, Absorption Type | Nov-2016 | D | Archived with no replacement. Note: The last published PDF version of this Section is available in the previous release in the UFGS Archives. | |
| 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 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. |
| 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 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. |
| 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-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 | |
| 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-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-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. | |
| 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. | |
| 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 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 | |
| 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-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 | |
| 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. | |
| 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. | |
| 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 |
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