Code of Federal Regulations · Section
§ 159.115 — Temperature Range Test
33 C.F.R. § 159.115
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(a) The device must be held at a temperature of 60 °C or higher for a period of 16 hours.
(b) The device must be held at a temperature of −40 °C or less for a period of 16 hours following winterization in accordance with manufacturers' instructions.