A double acting barometric damper is used to automatically shut off the fuel to the burner in the event of a fuel gas spillage exceeds how many seconds?

A double acting barometric damper is used to automatically shut off the fuel to the burner in the event of a fuel gas spillage exceeds how many seconds?

• A. 5 seconds
• B. 15 seconds
• C. 20 seconds
• D. 10 seconds

Answer: (D)

The safety mechanism hinges on how long venting remains unsafe. A double acting barometric damper monitors the draft and, if gas spillage continues for a sustained period, it automatically shuts off the burner fuel to prevent unburned gas from accumulating in the space. Ten seconds is the established threshold because it provides a quick response to a real spill while avoiding nuisance shutdowns from brief draft fluctuations. Shorter times, like five seconds, would cause more false trips; longer times, like fifteen or twenty seconds, could allow dangerous gas buildup before isolation.

The safety mechanism hinges on how long venting remains unsafe. A double acting barometric damper monitors the draft and, if gas spillage continues for a sustained period, it automatically shuts off the burner fuel to prevent unburned gas from accumulating in the space. Ten seconds is the established threshold because it provides a quick response to a real spill while avoiding nuisance shutdowns from brief draft fluctuations. Shorter times, like five seconds, would cause more false trips; longer times, like fifteen or twenty seconds, could allow dangerous gas buildup before isolation.