Morrison Brothers

Male Threaded Emergency Vents 244OM Emergency vent (pressure relief only) used on aboveground storage tanks, as a code requirement that helps prevent the tanks from becoming over-pressurized and rupturing if exposed to fire. UL and ULC listed. The 244 emergency vent consists of a body and a black powder coated cover (2" not powder coated) that moves up and down on a center pin. Pressure inside the tank forces the cover to lift up off the vent seat, allowing air to exhaust. The center pin guides the movement. When pressure falls the cover lowers back down onto seat and the vent is automatically reset. Warning: The 244 emergency vent is for “emergency pressure relief only” and must be used in conjunction with a “normal vent” or pressure vacuum vent such as a Morrison Fig. 354, 548, 748 or 749. Warning: The 244 emergency vent must be properly sized and selected for each specific tank application in order to meet the proper “venting capacity” requirements. See the Morrison Vent Guide for further instructions.