The ANSI NSPI-3 Standard for Permanently Installed Residential Spas is an important standards for residential pool/spa contractors. The standard is useful for the design, construction, and operation of residential swimming pools and it is widely used during contractor licensing exams. This Standard is for the design, equipment and installation of permanently installed residential spas and swim spas and does not cover public spas or factory built residential portable spa. American National Standard for Permanently Installed Residential Spas, 2014 ANSI/APSP-3
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