The One Way MVent is a moisture relief device consisting of a one piece spun aluminum vent pre-flashed with a modified bitumen membrane. Internally, the One Way MVent contains a neoprene valve that allows moisture vapor to escape out of the roof deck system without allowing moisture to enter through the valve. One Way MVents are flashed with either APP or SBS modified bitumen membranes, smooth or colored granule surfaces, to accommodate most built-up and modified bitumen roofing projects.
Unflashed vents are also available.
Five flashed or fifty unflashed per box. The One Way MVents are most commonly used in re-roofing applications. One Way MVents allow for continual release of vapor from within the system, while maintaining the watertight integrity from the outside. These MVents are typically used at the rate of one vent per 1,000 square feet of roof surface, or as specified by the roofing material manufacturer or system specifier. Spun aluminum design eliminates seams and soldered joints.