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Tjernlund Products is a manufacturer of mechanical ventilation and exhaust equipment, including draft inducers, power venters, duct booster fans, dryer duct boosters, and air transfer fans for residential and commercial HVAC applications. 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, activating automatically when the dryer operates and shutting 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 and 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, specified in situations where 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, or 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, making 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 — negative building pressure, restricted chimneys, tall buildings with variable stack effect — that require engineered solutions rather than passive venting changes.

How to Choose a Tjernlund Products Ventilation Solution

The most important decision variable when selecting a Tjernlund Products unit is the type of ventilation problem being solved: dryer duct restriction, combustion appliance draft deficiency, or room-to-room air transfer.

For dryer exhaust applications, the Tjernlund Products LB2 Dryer Duct Booster is appropriate when the total equivalent duct length exceeds what the dryer's built-in blower can push — up to 150 equivalent feet. For combustion appliance draft problems, Tjernlund Products offers both fixed-speed In-Line Draft Inducers and variable-speed VSAD Series inducers. When draft conditions are consistently low but stable, a fixed-speed In-Line inducer may be sufficient. When draft varies significantly with outdoor temperature, wind, or building pressure, the VSAD Series is the appropriate Tjernlund Products specification.

For multi-story or chimney cap installations where inline access is limited, Rooftop Draft Inducers provide an alternative mounting location. For room air distribution problems in residential or light commercial buildings, AireShare Transfer Fans address the issue without requiring duct modifications. Consulting Tjernlund Products' sizing guides and the appliance manufacturer's draft requirements is recommended for any combustion venting application.

FAQs

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. Warranty details for other Tjernlund Products ventilation equipment are available through their official warranty policy documentation.
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?: 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 — Tjernlund Products' sizing guides confirm the appropriate model for a given installation.
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.

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