Master Flow® Foundation Vent ‑ Block Style ‑ BVSII Specs

      Master Flow® Foundation Vent ‑ Block Style ‑ BVSII Docs

      Master Flow® Foundation Vent ‑ Block Style ‑ BVSII Videos

      Why Master Flow® Foundation Vent ‑ Block Style ‑ BVSII?

      Easy icon

      Easy

      Aluminum vanes; lintel not required
      Convenient icon

      Convenient

      For block, brick, or frame construction
      Versatile icon

      Versatile

      Recommended for high-level ventilation
      GAF factory-certified roofing companies near you

      Related products for Master Flow® Foundation Vent‑ Block Style‑ BVSII

      Sample of four of Timberline HDZ shingles color swatches

      Timberline HDZ®

      Shingles
      Learn More
      DeckArmor roof deck protection for roofs in new packaging

      Premium Breathable Roof Deck Protection

      Premium breathable synthetic underlayment for shingles/other roofing systems
      Learn More
      a single ProStart Starter strip shingle

      Starter Strip Shingles

      Eave/rake starter strip for standard-size asphalt shingles
      Learn More

      Get automatic Lifetime Protection on your entire GAF roofing system

      When you install any GAF Lifetime Shingle and at least 3 qualifying GAF accessories, you'll automatically get a Lifetime limited warranty on your shingles and all qualifying GAF accessories*.
      Residential LRS logos

      Where to buy

      Find a GAF distributor near you.

      Find a contractor

      Find a GAF certified contractor near you.