Tjernlund V2D UnderAire Crawl Space Ventilator – 220 CFM Moisture Reduction

The Tjernlund V2D UnderAire Crawl Space Ventilator is designed to move air under your home, refreshing the space through existing passive vents. By circulating outdoor air beneath porches and overhangs, it helps create a more comfortable and breathable crawl space environment without invasive ductwork.

How it works: The system combines two compact fans with a substantial face plate to optimize airflow through standard openings found in brick and block foundations. At its core is a 220 CFM capability powered by a 40-watt motor, delivering reliable movement of air between the exterior and the crawl space. This steady airflow can help reduce damp pockets, improve air turnover, and minimize the musky odors often associated with enclosed spaces beneath a home.

Key features at a glance

• Powerful 220 CFM exhaust designed to move air where it matters most in crawl spaces
• Two fans paired with a large face plate tailored for ventilation openings in brick and block foundations
• Integrated thermostat and dehumidistat for automated, adaptive operation
• Pre-wired 6-inch power cord for straightforward installation and tidy wiring
• Maintenance-free exhaust design aimed at long-term, dependable performance

Real-world applications

• Under homes with passive vents, the unit can encourage consistent air exchange during dry spells or milder weather
• Porches and overhangs with ventilation openings may benefit from enhanced airflow, helping to curb moisture buildup
• Concrete block foundations often accommodate the two-fan setup for balanced cross-ventilation in the crawl space