1 united states requirements, 2 canadian requirements, 2 unvented operation – Roberts Gorden Low Intensity Unitary Heater Designed for Harsh Environments HE-40 User Manual
Page 42: 3 horizontal venting, 4 vertical venting, 5 unvented operation tube termination, Figure 22: tube termination, 6 length requirements, Section 8.2 fo
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