Paragraph 4
After the end of the tests specified in paragraphs 2 and 3 of this Schedule the draught shall be stopped and the heater allowed to burn for 15 minutes. During this 15 minute period no flame shall appear outside the heater.
After the end of the tests specified in paragraphs 2 and 3 of this Schedule the draught shall be stopped and the heater allowed to burn for 15 minutes. During this 15 minute period no flame shall appear outside the heater.