OlyVent Aluminum 1-Way Vent

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 built-up roof systems.

Key Features

• one-way Duro-Nitrile rubber valve lets air escape, helping prevent blistering and insulation damage
• heavy gauge spun aluminum body for strength and durability
• conical shape and wide base opening for better flashing and performance detail
• vandal-proof cap to resist unwanted entry of debris or weather
• clearly marked one-way design for easy inspection and maintenance

• item number: OV1WAY
• height: 8 in
• base diameter: 11 in
• stack diameter at base: 5 in
• body thickness: .051 in aluminum
• number of vent holes: 8
• vent hole diameter: ½ in (rubber valve areas)
• cap diameter: 4 in
• cap thickness: .051 in aluminum
• valve material: Duro-Nitrile rubber
• recommended spacing: one OlyVent per 1,000 sq ft roof area

• Cut a 4-inch diameter opening through roofing membrane and insulation down to the roof deck.
• Remove membrane and insulating materials down to vapor barrier or roof deck.
• Set the OV1WAY vent over the opening and fasten it to the deck using appropriate fasteners.
• Flash around the base per the roof cover manufacturer’s flashing details.
• Inspect to ensure cap markings identify “one-way” and ensure vent is seated properly.
• Follow manufacturer and roof system guidelines for vent spacing, usually about one vent per 1,000 sq ft unless design or engineer recommends otherwise.

Q: What is the purpose of the OV1WAY vent?
A: It lets trapped air pressure escape from the roof system, reducing blistering and damage to insulation and membrane.

Q: What materials is the OV1WAY made of?
A: Heavy gauge spun aluminum for the body and cap; the valve is made of Duro-Nitrile rubber.

Q: What are its dimensions?
A: Height is 8 in; base diameter is 11 in; stack diameter at base is 5 in.

Q: How many vents should be used on a roof?
A: Recommended spacing is one OV1WAY per 1,000 square feet of roof, though actual placement should follow roof system manufacturer or engineer instructions.

Q: Can it be used with single-ply or built-up roofing systems?
A: Yes, it is compatible with both single-ply and built-up roof applications.