The time it takes for a residual gas smell to completely dissipate from a house depends heavily on how well the space is ventilated, ranging from just a few minutes to several hours. If the odor is minor—such as from a brief puff of unburned gas during a stove burner ignition or a pilot light check—opening windows and doors to create a cross-breeze will usually clear the smell out entirely within fifteen to thirty minutes. However, if there was a more significant leak that has since been professionally repaired, trapped odor molecules can linger in soft furnishings, carpets, and drywall, requiring extensive mechanical ventilation, fans, and sometimes air purifiers with activated carbon filters over twenty-four to forty-eight hours to eliminate the scent completely.
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