Ul 242 !new!

Standardized vents, particularly conservation vents, help minimize the release of harmful Volatile Organic Compounds (VOCs) into the atmosphere.

The investigation revealed that the non-UL 242 thermostat had developed a film of corrosion on its bimetal disc after just 14 months in a humid basement. That film created electrical resistance, which generated heat, which fooled the thermostat into thinking the water was hotter than it was. The heater never shut off. ul 242

These are often "weighted" to remain closed until a specific pressure or vacuum threshold is reached, helping to reduce evaporative losses of volatile fuels. 2. Key Testing Requirements particularly conservation vents