Section 6: suggested layouts, Review venting options before selecting a layout, 1 tf-380 - 4 elbow design (common vent) – Roberts Gorden Vantage twin Fire Unitary Infrared Heater TF-250 User Manual
Page 20: 2 tf-350 - 4 elbow design (common vent), 3 tf-300 - double "u" design (common vent)
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