4 Facts in 60 Seconds: Tjernlund DB-2 Duct Booster Duct Fan. Tjernlund Products manufactures the Duct Booster brand Duct Fans that help make hot or cold rooms more comfortable. Use the Duct Booster (Model DB-2) with your forced air furnace or air conditioner to boost air over long duct runs to rooms that are too hot or too cold. This product is available at many HVAC distributors and online stores. Inline EF Series versions also available. (EF-6 through EF-14). Simply search "Tjernlund Duct Boosters" or DB-2. More information available at www.Tjernlund.com.
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