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BattenVents are made of High-Density polyethylene plastic that are available in various sizes for example 2-ply measuring 2-3/8″ wide X 3/8” thick X 36” long. These are designed for maximum cross ventilation on the job with installation flexibility (ie: cedar roofing battens, wall siding battens, fascia strip venting, above rafter venting for skylights, etc. Custom sizes are also available.