Innovative dry formula metered air fresheners. ultra fine spray-long suspension time. dual odor counteraction system. non-chlorinated, non-ozone depleting, nonpropritary actuator on these metered air fresheners metered air fresheners will last 30 days when used 24 hours a day when spraying every 15 minutes. the metered valve delivers precise spray volumes in an ultra fine mist to effectively freshen rooms up to 6,000 cubic feet. time metered air fresheners are highly concentrated. 6.35 oz. net weight per can.