Vents/Breathers

OV1WAY is OMG’s one-way aluminum roof vent from the OlyVent line, designed to allow trapped air pressure within a roof system to escape via a rubber valve while preventing ingress of rain, snow or pests. Its wide base and conical design improve flashing details and make installation easier than standard cylindrical vents. Manufactured from heavy-gauge spun aluminum and fitted with a durable Duro-Nitrile rubber valve, this vent is suitable for various roofing types, including single-ply and...

OV2WAY is OMG’s two-way breather roof vent in the OlyVent product line, designed to help manage both trapped air pressure and moisture within roofing assemblies. It features a Duro-Nitrile rubber valve, spun aluminum body, and wide base for effective flashing detail. The two-way design works together with one-way vents to improve ventilation and prolong roof system life in both single-ply and built-up roofing applications. Key Features allows release of trapped air plus evacuation of moisture...

The Portals Plus 71028 Aluminum 1-Way Vent is designed to relieve moisture vapor from roof systems and prevent ballooning, insulation damage, or deck seam separation. It features a one-way valve to prevent external moisture re-entering the roof system and is built of .050″ spun aluminum with a 12″ base flange, a 4.25″ stand-pipe opening, and a 2.75″ locking, vandal-proof rain cap. Installation spacing is approximately one vent per 1,000 sq ft of roof area. Key features: One-way valve prevents...

The Portals Plus 72008 2-Way Black Plastic Breather relieves trapped vapor and equalizes air pressure in roof systems, helping prevent insulation damage and deck separation. Constructed of black high-density polyethylene, this dual-direction breather allows both exhaust and convective airflow between units and includes a locking, vandal-proof rain cap to ward off wind-blown rain and snow. Ideal for flat and low-slope roofs, spacing is approximately one breather per 1,000 square feet. Key...

The Portals Plus 72018 1-Way Black Plastic Vent is designed to allow moisture vapor to escape from roof systems and prevent moisture from re-entering the system. Built of high-density polyethylene (HDPE) in black, the unit features a base flange diameter of 10.5″ and height of 7.75″, with a stand-pipe 5.5″ base opening and a 2.5″ counter-flashing rain cap with locking, vandal-proof design. The vent is specified at a spacing of approximately one unit per 1,000 sq ft of roof area. Key features:...

The Portals Plus Large Aluminum 1-Way Vent provides a high-capacity roof system venting solution designed to relieve trapped moisture and air pressure in large roof areas. Constructed of heavy-gauge .060″ spun aluminum with abase flange diameter of 11.5″ and a minimum height of 11″, it features a 6.5″ stand-pipe base opening and a 4.5″ counter-flashing locking, vandal-proof rain cap. It is specified for use at approximately one unit per 1,500 square feet of roof area (retailers ship in cases...

The Portals Plus 71008 Aluminum 2-Way Breather allows for both exhaust and convective movement of air between breathers, helping relieve moisture vapor and equalize air pressure in roof systems. Constructed from heavy-gauge .050″ spun aluminum with a 12″ base flange and 9″ height, it includes a locking, vandal-proof rain cap to protect against intrusion of wind-blown rain or snow. Recommended for installation at approximately one per 1,000 sq ft. Key features: Heavy-gauge .050″ spun aluminum...

The Portals Plus 74004 and 74044 are large 2-way aluminum breathers designed to relieve moisture vapor and equalize air pressure in commercial roof systems. They feature heavy-gauge spun aluminum construction (.060″ gauge) with a base flange diameter of 11.5″ and a stand-pipe opening of 6.5″. The units include a locking, vandal-proof rain cap and are packaged in cases of four. Installation spacing is recommended at one unit per 1,500 square feet. Key features: Heavy-gauge spun aluminum body...

The Marathon MC Vent (BV-10156 for One Way, BV-10157 for Two Way) is a medium-capacity aluminum roof vent designed to provide pressure equalization while shielding against wind-blown rain or snow. Spun from heavy gauge aluminum, it features a security cap and an optional foam insert to minimize condensation. With a wide 12-inch flange and a base opening of 6-1/2″, this vent offers reliable performance in roof ventilation applications. Key Features: One-way (BV-10156) or two-way (BV-10157)...