Tjernlund
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Tjernlund Products is a manufacturer of mechanical ventilation and exhaust equipment for residential and commercial HVAC applications. Its products include draft inducers, power venters, duct booster fans, dryer duct boosters, and air transfer fans. The company has been manufacturing ventilation solutions in the United States since 1938. Tjernlund Products' ventilation equipment is designed to address combustion air delivery, exhaust draft deficiencies, duct airflow restrictions, and dryer duct performance in residential and light commercial installations. The LB2 Dryer Duct Booster carries a 5-year warranty and is engineered to boost exhaust velocity in dryer duct runs up to 150 equivalent feet. HVAC contractors, plumbers, and new construction crews specify Tjernlund Products when a building's existing ductwork or chimney conditions create ventilation challenges that passive systems can't resolve.
Product Lines
LB2 Dryer Duct Booster
The LB2 Dryer Duct Booster is Tjernlund Products' inline booster fan for dryer exhaust duct systems with runs too long for a standard dryer blower to push effectively. The LB2 is engineered to boost exhaust velocity in dryer duct runs up to 150 equivalent feet. It activates automatically when the dryer operates and shuts off when the dryer cycle ends. The LB2 carries a 5-year warranty and requires no filter cleaning or ongoing maintenance.
VSAD Variable Speed Auto-Draft Inducers
The VSAD Series is Tjernlund Products' variable-speed draft inducer line for gas-fired boilers and furnaces experiencing inadequate chimney draft. VSAD inducers mount in the vent connector between the appliance and the chimney. They modulate fan speed to maintain consistent draft regardless of barometric pressure changes, wind conditions, or negative building pressure. Contractors specify the VSAD Series when combustion problems trace back to inconsistent draft at the appliance.
In-Line Draft Inducers
Tjernlund Products' In-Line Draft Inducers are fixed-speed induced-draft fans for gas-fired boilers, furnaces, and water heaters with restricted chimneys or inadequate natural draft. In-Line Draft Inducers mount directly in the vent connector and are sized to the BTU input of the appliance. The In-Line series differs from the VSAD Series in that it operates at a fixed speed, making it the more economical Tjernlund Products specification for stable draft deficiency applications.
AireShare Air Transfer Fans
AireShare Transfer Fans are Tjernlund Products' low-profile, through-wall air transfer units designed to move conditioned air between rooms in residential and light commercial buildings. AireShare fans address rooms with poor airflow from the central HVAC system without requiring additional ductwork. They are specified when a room consistently runs warmer or cooler than the rest of the building.
Rooftop Draft Inducers
Tjernlund Products' Rooftop Draft Inducers mount at the chimney cap and create draft from the top of the flue rather than inline at the appliance connection. Rooftop inducers are appropriate for multi-story buildings or installations where access for inline mounting is limited. They also suit installations where the draft deficiency is traced to the top section of the chimney.
Why Contractors Specify Tjernlund Products
Tjernlund Products has been manufacturing ventilation and draft control equipment in the United States since 1938. This makes it one of the longest-running domestic manufacturers in the HVAC ventilation specialty segment. The LB2 Dryer Duct Booster's 5-year warranty and no-maintenance design are frequently cited by service contractors as reasons for specifying Tjernlund Products on dryer duct retrofit jobs. The company's draft inducer line addresses combustion appliance venting problems that require engineered solutions rather than passive venting changes. These problems include negative building pressure, restricted chimneys, and tall buildings with variable stack effect.
Frequently Asked Questions
Where are Tjernlund Products manufactured?
Tjernlund Products has been proudly manufacturing ventilation equipment in the United States since 1938.
What warranty does Tjernlund Products offer on the LB2 Dryer Duct Booster?
The Tjernlund Products LB2 Dryer Duct Booster carries a 5-year warranty.
What's the difference between the Tjernlund Products VSAD Series and the In-Line Draft Inducer?
The VSAD Series is a variable-speed draft inducer that modulates fan speed to maintain consistent draft as conditions change. The In-Line Draft Inducer operates at a fixed speed, appropriate for stable draft deficiencies. VSAD is the better specification when draft conditions are variable; the In-Line series is the more economical choice for straightforward fixed-deficiency applications.
What dryer duct run length can the Tjernlund LB2 handle?
The Tjernlund Products LB2 Dryer Duct Booster is engineered to boost exhaust velocity in dryer duct runs up to 150 equivalent feet. The LB2 activates automatically when the dryer operates and requires no ongoing maintenance or filter cleaning.
Are Tjernlund Products draft inducers compatible with all gas-fired boilers and furnaces?
Not necessarily. Tjernlund Products draft inducers are designed for use with gas-fired boilers, furnaces, and water heaters experiencing inadequate chimney draft. Compatibility depends on the BTU input, flue connection size, and measured draft deficiency.
What Tjernlund Products unit is right for a room with poor airflow from the central HVAC system?
For a room consistently warmer or cooler than the rest of the building due to insufficient supply airflow, the Tjernlund Products AireShare Transfer Fan is the appropriate solution. AireShare units move conditioned air through the wall from an adjacent room without requiring additional duct runs.
