Our most economical polyester-based ventilation product.
- Won’t absorb moisture, which can freeze and block all ventilation
- M63 Marco proprietary adhesive for superior hold
- Easy, one-person installation
- 40-year limited warranty
- ASTM testing: D1929, D737
- Available in 10’ and 20’ rolls and multiple packaging options
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Marco’s Flex-O-Vent™ Universal Venting Material vents, protects and lasts like no other. While polyurethane products constantly expand (as they soak up water) and contract (as they dry out) causing them to disintegrate and fail, Flex-O-Vent offers 40 years of Weather-Tite performance. Its specially formulated polyester— manufactured from recycled material—prevents moisture absorption and holds together to help keep out pests. It’s also extremely durable, flame-resistant, clog-resistant, and tear-resistant.
Flex-O-Vent is not only an economical choice, it’s a long-term solution that provides plenty of cooling air flow, which is vital to meet building codes, reduce utility costs, and minimize long-term building damage caused by improper ventilation.
Net Free Area: 23 sq. in. for 1” free-standing product*
1- 1/2” x 3” x 10’: Rib heights up to 1-1/4”
1- 1/2” x 2” x 10’: Rib heights up to 1-1/4”
1” x 3” x 10’: Rib heights up to 3/4”
1” x 2” x 10’: Rib heights up to 3/4”
Air Permeability: >760 Cubic Feet per minute
Cold Cracking: -55˚ C (-130˚ F)
Tear Strength: 3.5 ppi
Tensile Strength: 16 psi – Elongation 175%
Compressive Strength: 1.8 psi at 75%
Abrasion: No Damage
*Effective Net Free Area varies based on product height, panel profile, and installation methods.
Easy, One Person Installation
With Flex-O-Vent, one size fits most panels. Installation is a simple two-step process easily handled by one installer. Flex-O-Vent comes in easy-to-handle 10-foot rolls (mirroring most ridge cap lengths) or larger 20-foot rolls if you prefer. It is easily cut with scissors or utility knife and a double bead of M63 adhesive holds Flex-O-Vent securely in place until the ridge cap is installed.