1.1本规程描述了减少氡进入现有三层或三层以下附属和独立住宅的方法。本规程适用于经过培训、认证或许可的人员，或两者兼有，或其他合格人员。 1.2这些方法基于有效降低各种住宅建筑和土壤条件中氡水平的氡缓解技术。这些风扇供电的缓解方法列于 附录X1 . 更详细的信息包含在本实践中引用的参考文献中。 1.3本规程旨在为氡缓解承包商提供一套统一的规程，以确保高度的安全性，并确保使用氡缓解系统改造低层住宅建筑的成功可能性。 1.4本实施规程中描述的方法适用于当前占用或以前占用的住宅建筑，包括转换或正在转换为住宅用途的建筑，以及通过增加或更改或两者同时更改或正在更改的住宅建筑。指南涵盖了新住宅在施工期间、入住前以及入住后长达一年的降氡活动 E1465 . 1.5本规程还旨在作为一套示范规程，可由州和地方司法机构采用或修改，以实现其特定氡承包商认证或许可证计划的目标。根据本规程进行的氡缓解被视为普通维修。 1.6本实践中涉及的方法包括以下类别的承包商活动:一般实践、建筑调查、系统设计、系统安装、材料、监控器和标签、缓解后测试和文件。 1.7以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.8 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 参见第节 6. 针对特定的安全隐患。 ====意义和用途====== 5.1本实施规程中所述方法、系统和设计的目的是减少居住建筑居住者因氡及其子体引起的辐射暴露。缓解的目标是将建筑物可占用区域的氡浓度保持在合理可行的最低水平。本规程包括为安装和维修氡缓解系统的工人减少氡及其子体引起的辐射暴露的章节。工人的目标是将氡及其子体的暴露降低到合理可行的最低水平。 5.2本文所述的方法、系统、设计和材料已被证明在三层或三层以下的附着式和独立式住宅中很有可能成功地减少氡（见EPA，“现有独立式房屋的氡减少技术，主动土壤降压系统的技术指南（第三版）” ). 然而，这些方法的应用并不能保证将氡水平降低到任何特定水平以下，因为性能会随现场条件、施工特点、天气和建筑操作而变化。 5.3在应用本惯例时，承包商还应遵守所有适用的地方、州和联邦法规，以及与住宅建筑施工、改建和改善有关的法律。

1.1 This practice describes methods for reducing radon entry into existing attached and detached residential buildings three stories or less in height. This practice is intended for use by trained, certified or licensed, or both, or otherwise qualified individuals. 1.2 These methods are based on radon mitigation techniques that have been effective in reducing radon levels in a wide range of residential buildings and soil conditions. These fan powered mitigation methods are listed in Appendix X1 . More detailed information is contained in references cited throughout this practice. 1.3 This practice is intended to provide radon mitigation contractors with a uniform set of practices that will ensure a high degree of safety and the likelihood of success in retrofitting low rise residential buildings with radon mitigation systems. 1.4 The methods described in this practice apply to currently occupied or formerly occupied residential buildings, including buildings converted or being converted to residential use, as well as residential buildings changed or being changed by addition(s) or alteration(s), or both. The radon reduction activities performed on new dwellings, while under construction, before occupancy, and for up to one year after occupancy, are covered by Guide E1465 . 1.5 This practice also is intended as a model set of practices, which can be adopted or modified by state and local jurisdictions, to fulfill objectives of their specific radon contractor certification or licensure programs. Radon mitigation performed in accordance with this practice is considered ordinary repair. 1.6 The methods addressed in this practice include the following categories of contractor activity: general practices, building investigation, systems design, systems installation, materials, monitors and labeling, post-mitigation testing, and documentation. 1.7 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. See Section 6 for specific safety hazards. ====== Significance And Use ====== 5.1 The purpose of the methods, systems, and designs described in this practice is to reduce radiation exposures for occupants of residential buildings caused by radon and its progeny. The goal of mitigation is to maintain reduced radon concentrations in occupiable areas of buildings at levels as low as reasonably achievable. This practice includes sections on reducing radiation exposure caused by radon and its progeny for workers who install and repair radon mitigation systems. The goal for workers is to reduce exposures to radon and its progeny to levels as low as reasonably achievable. 5.2 The methods, systems, designs, and materials described here have been shown to have a high probability of success in mitigating radon in attached and detached residential buildings, three stories or less in height (see EPA, “Radon Reduction Techniques for Existing Detached Houses, Technical Guidance (Third Edition) for Active Soil Depressurization Systems” ). Application of these methods does not, however, guarantee reduction of radon levels below any specific level, since performance will vary with site conditions, construction characteristics, weather, and building operation. 5.3 When applying this practice, contractors also shall conform to all applicable local, state, and federal regulations, and laws pertaining to residential building construction, remodeling, and improvement.