IAPMO Z124.7 – Prefabricated Plastic Spa Shells IAPMO Z124.7-2013 (R2018) covers prefabricated plastic spa shells and specifies requirements for materials, construction, performance testing, and markings.

The requirements of this Standard are not intended to prevent the use of alternative materials or methods of construction provided such alternatives meet the intent and requirements of this Standard.

In this Standard,

(a) “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy to comply with the standard;
(b) “should” is used to express a recommendation but not a requirement;
(c) “may” is used to express an option or something permissible within the scope of the standard; and
(d) “can” is used to express either a possibility or a capability.

Notes accompanying sections in the body of the Standard do not specify requirements or alternative requirements; their purpose is to separate explanatory or informative material from the text. Notes to tables and figures are considered part of the table or figure and can be written as requirements.

SI units are the primary units of record in global commerce. In this Standard, the inch/pound units are shown in parentheses. The values stated in each measurement system are equivalent in application but each unit system is to be used independently. Combining values from the two measurement systems can result in non?conformance with this Standard.