Section 658-109-13 - Vent Alarms1. All No. 1 and No. 2 fuel oil tanks from 11 to 5,000 gallon capacity located inside a structure shall have a vent alarm.2. All No. 1 and No. 2 fuel oil tanks from 65 to 5,000 gallon capacity located outside shall have a vent alarm.3. All vent alarms must be installed according to Manufacturer's Instructions.02-658 C.M.R. ch. 109, § 13