FVIR TECHNOLOGY
All residential gas-fired water heaters built with FVIR technology meet the latest edition of the North American Standards ANSI Z21.10.1/CSA 4.1. They are specially designed to prevent the ignition of flammable vapours such as aerosol sprays, cleaning solvents, gasoline, paints, paint thinner, and thinner lacker, outside of the water heater.
UG40, UG50 and UG60
Natural Gas Models
| Maximum equivalent length |
|---|
| 2 inch (5.1 cm) vent | 50 feet (15.2 m) |
| 3 inch (7.6 cm) vent | 80 feet (24.4 m) |
UG50-62
Natural Gas and Propane Models
| Maximum equivalent length |
|---|
| 3 inch (7.6 cm) vent | 60 feet (18.3 m) |
| 4 inch (10.2 cm) vent | 180 feet (54.9 m) |
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