SGM-SF_2017with 12/20 Revisions

ANSI/AARST SGM-SF 2017 (with 1220 revisions) Soil Gas Mitigation Standards for Existing Homes 43 12.0 NON- ASD SYSTEMS AND METHODS 12.1 For All Non- ASD Methods Informative advisory —For general applicability of these methods and impact on other indoor air quality issues, see “Indoor Air Quality Guide – Best Practices for Design Construction and Commissioning” published by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHREA). www.ashrae.org 12.1.1 Appropriateness of design All systems and methods shall meet the needs for an appropriate design, in accordance with Section 5.3 . 12.1.2 Combination of methods and/or systems Each method applied shall be installed to conform with requirements of Section 8 All Systems and Methods . 12.1.3 Important maintenance inspections A regiment of routine inspection shall be recommended in accordance with a) Section 13.7.2 in an operation, maintenance and monitoring ( OM&M ) manual; b) Table 13.7 to include all filters, exterior intake and exhaust vents, duct balance, controls and other components; and c) Section 10.3 or Table 13.7 , as applicable. 12.1.4 Pressurization or dilution methods 12.1.4.1 Qualified Ventilation Professional When changes are made to ventilation system design, all requirements of the local jurisdiction for qualifications such as licensing or certification programs shall be observed. Informative advisory— In addition to requirements in Section 3.2 , the contractor, contracting team or management team should include at least one “Qualified Ventilation Professional” when modifying ventilation. A “Qualified Ventilation Professional” is an individual qualified, at a minimum, to conduct and evaluate airflow dynamic measurements as required by various provisions within this annex. The appropriate technical knowledge requires hands-on experience and training as obtained by: trade-specific courses such as for energy auditing; specific radon training courses; design of HVAC; or mechanical engineering. 12.1.4.2 Diagnostics Evaluations Required Diagnostic evaluations shall be performed prior to installation or augmentation of systems when methods that entail building pressurization or building dilution are being considered. Diagnostic evaluations are needed to: a) ensure feasibility of desired radon reductions with such methods; and b) aid considerations of unintended consequences regarding energy penalties and health, safety and comfort of occupants. 12.1.4.3 Informative — OM&M Maintenance Inspections Airflow in and airflow out of HVAC system(s) and duct balance should be checked to ensure that no significant changes have occurred. Examples of HVAC inspection items: a) functionality of HVAC filters; b) room differential pressure test; c) fresh-air damper settings; and d) verification for supply air into rooms of interest. 12.1.4.4 Seasonal Test Validation— OM&M A notice regarding additional testing is also required when mitigation methods include pressurization or dilution. Where employed, the OM&M plan shall prominently include the following statement: “The mitigation system includes pressurization or dilution of building air and requires additional and ongoing testing. In locations where elevated radon concentrations were originally found, conduct post-mitigation or diagnostic radon testing during the first year subsequent to installation to verify if system capacity and control settings are effective under stressed or different seasonal conditions. To satisfy this requirement, conduct such testing at least once in the heating season (e.g., November to March, when heating systems are active) and once in the cooling season (e.g., May to August, when cooling systems are active).”