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Rinnai Gas Direct Vented Space Heaters These energy efficient space heaters are freestanding gas unit heaters with the ability to modulate both its burner and blower to provide maximum efficiency and comfort. The Rinnai Space Heater incorporates an electronically driven 7-stage gas control system to maintain an even and continuous heat output to give you stable room temperature. The Rinnai Direct Vented Heaters are attractive, quiet, compact and have a Cool-to-the-touch cabinet. Rinnai Heaters extended life stainless steel heat exchanger transfers 84% of consumed gas energy to useful heat.
| Vent Type | Rinnai Heater Model | Extend From / To | Hole Diameter For 431/556 | Application |
| S | FOT-150 | 3" to 4 1/2" | 3 inches | Thin Walls Mobile Homes |
| A |
FOT-151
Standard with all heaters |
4 1/2" to 9 1/2" | 3 inches | Wood Walls |
| B | FOT-152 | 9 1/2" to 15 3/4" | 3 inches | Wood/Brick Walls |
| C | FOT-153 | 15 3/4" to 23 5/8" | 3 inches | Brick/Block Walls |
| D |
FOT-154
Special Order only |
23 5/8" to 31 1/2" | 3 inches | Special |