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Ducts that operate at temperatures exceeding 120°F (49°C) shall have sufficient thermal insulation to limit the exposed surface temperature to 120°F (49°C).
Ducts that operate at temperatures exceeding 120°F (49°C) shall have sufficient thermal insulation to limit the exposed surfacetemperature to 120°F (49°C) ...
Heating elements shall be so designed and maintained that their surfacetemperature will not cause the solvent or mixture to decompose, break down, or be converted into an excessive quantity of vapor.
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