In the US, no federal regulation specifically mandates flame-retardant window treatments in private residential rentals. However, fire safety requirements for furnished rentals vary significantly by state, county, and local code — and some jurisdictions, particularly in high-density urban areas or short-term rental markets, do require window treatments to meet specific flame spread ratings under their local building or fire codes. Additionally, insurers of furnished rental properties increasingly require fire-safe furnishings as a policy condition. Specifying FR-certified curtains such as the Rewild Sublime provides a documented, auditable record of fire safety compliance that protects both landlords and tenants. Always confirm your specific obligations with local fire safety authorities.