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Lambro 4-In. Galvanized Steel Fresh Air Vent – 11-In. Pipe

$17.99 on Amazon.com (as of October 19, 2026, 1:23 PM EST) View details ↗

The Lambro 34400GNDMS 4-In. Galvanized Steel Fresh Air Intake Vent ensures proper ventilation for indoor gas appliances by drawing in clean outdoor air. Ideal for homes with modern, airtight construction or gas-powered systems like heaters, fireplaces, water heaters, and dryers, this vent helps maintain safe and efficient operation while preventing backdrafts.

Featuring a durable galvanized steel construction, this vent resists corrosion and stands up to harsh weather conditions. The included wire-mesh screen filters out debris, keeping the intake clear while allowing fresh air to flow freely. With an 11-inch pipe length, it’s designed for through-the-wall installations and fits over existing 4-inch openings, making it a seamless solution for both new builds and replacements.

Pipe Length11″ (through-the-wall)
Opening Size4″ (fits existing openings)
MaterialGalvanized steel with wire-mesh screen
CompatibilityGas heaters, fireplaces, water heaters, dryers
Installation TypeThrough-wall (no damper)
Can this vent be used for both new installations and replacements?
Yes, it fits over existing 4-inch openings and is suitable for both new builds and retrofitting.
Does the wire-mesh screen require maintenance?
The screen is designed to filter debris, but it may need occasional cleaning to maintain airflow.
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