Premium Large Capacity heat weldable PVC Roof Vent for pressure/moisture relief of roof systems. Available in one way or two way that meets 1-150 or 1 - 300 National Venting Code in combination with inlet vents.
Pre-Vent design provides venting capacity to accommodate 327 sq feet of floor. The Pre-Vent is UV Stabilized to help reduce any deterioration and fading from the sun.
To install the Pre-Vent properly it has been designed with pre- drilled holes in the flange to attach the Pre-Vent to the deck. The Pre-Vent when used with mechanical venting should be insulated accordingly to assist in directing the release of internal condensation. The base of the penetration within the Pre-Vent should be sealed to maintain the integrity of the roofing system. See your membrane manufacturers for details.
Venting capacity will be maintained through pipe sizes up to 80% of the diameter of the Pre-Vent.
Caps must be adhered to base with PVC glue.
Features
- Super heavy duty PVC plastic for long life
- Exclusive one-way valve design to prevent moisture from re-entering the roof system
- Special insect resistant wire screen
- Vandal proof
- Pre-drilled flange for fastening to roof deck
Options
- Available in one-way or two-way
Information
Part #
One Way - BV-1205
Two Way - BV-1252P
Two Way (w/2'x2' TPO skirt) - BC2‐1004
Specifications
| Overall height | Base opening | Flange diameter | Flange material | Recommended spacing |
| 9" | 10-1/4" | 14-3/4" | PVC | 1 Per 2,000 SQ. FT. |
I really like the products we purchase from Marathon. They are always helpful and much nicer to deal with than my previous manufactures.
— Bob, Commercial Coordinator, ABC Supply Company, Austin, Texas