IN-LINE BOOSTER DUCT FANS INSTALLATION INSTRUCTIONS

by Suncourt Inc. March 20, 2026

INSTALLATION INSTRUCTIONS FOR IN-LINE BOOSTER DUCT FANS

READ AND SAVE THESE INSTRUCTIONS

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WARNING - RISK OF ELECTRIC SHOCK, CAN CAUSE INJURY OR DEATH: DISCONNECT AND/OR LOCKOUT ALL REMOTE ELECTRIC POWER BEFORE SERVICING OR INSTALLING, WHEN THE SERVICE DISCONNECTING MENS CONNOT BE LOCKED, SECURELY FASTEN A PROMINENT WARNING DEVICE, SUCH AS A TAG TO THE SERVICE PANEL.

WARNING - USE COPPER SUPPLY WIRES ONLY

WARNING - FOR GENERAL VENTILATING USE ONLY. DO NOT USE TO EXHAUST HAZARDOUS OR EXPLOSIVE MATERIALS AND VAPORS. DO NOT USE TO EXHAUST AIR LADEN WITH LINT, GREASE, OR OIL.

WARNING - PRODUCT INTENDED INSTALLATION IS AN INLINE DUCT FAN WITH BOTH ENDS CONNECTED TO DUCTWORK. FOR ANY OTHER INSTALLATION GUARDS MUST BE INSTALLED TO PRVENT UNINTENTIONAL CONTACT WITH MOVING FAN BLADE UNLESS THE UNIT IS MOUNTED WITHT HE LOWEST MOVING PARTS AT LEAST 2.4M (8FT) ABOVE FLOOR OR GRADE LEVEL.

WARNING - FAN IS SUITABLE FOR ONLY CONNECTION TO A DUCT SUPPLYING SINGLE ROOM DISCHARGE (MODELS: DB204C, DB205C, DB206C, DB208C, DB210C)

Use this unit only in the manner intended by the manufacturer. If you have any questions, contact the manufacturer. You may phone the manufacturer during normal business hours at 1-800-999-3267 or submit your questions from our website: www.suncourt.com. In-line Duct Fans are designed to boost dry conditioned (heated or cooled) indoor airflow in ducts of forced air systems with temperatures between 40 degrees F and 140 degrees F. Suncourt accepts no responsibility for use of this product in other applications.

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EXPOSURE TO AIRFLOW TEMPERATURES EXCEEDING 140F WILL PERMANENTLY DAMAGE THE FAN AND VOID THE WARRANTY.

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ELECTRCAL SFETY INSTRUCITONS

WARNING - To reduce the risk of fire, electrical shock, or injury to persons, observe the following: Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable codes and standards, including fire-related construction and accessibility. Your in-line duct fan must be connected to a 110/120 volt AC, 60Hz fuse or circuit breaker protected power source only in a manner approved by all applicable codes. Never connect your in-line duct fan to a 240 volt AC blower motor or 9other 240 volt systems. Never connect you in-line duct fan to a variable-speed (ECM) furnace blower. The power source must be protected by a fuse or circuit breaker rated at the minimum of 15 amps. The power cord can be plugged into any standard (NEMA 5-15) 3-prong outlet. The outlet supplying power tot he cord must included a ground terminal properly connected to a ground source. The power cord should be secured to a location where it is not subject to damage, abrasion, or temperatures exceeding 140F.

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GENERAL INSTALLATION NOTES

For maximum performance and minimum noise, the best location to install your in-line duct fan is 6 to 10 feet from the register that needs the boosted air. To prevent air leaks, use a good quality aluminum foil tape to seal the seams in the ductwork after installing. By utilizing tapered reducers, you may install larger diameter duct fans in smaller diameter ducts to achieve greater boosted airflow. Always leave your in-line duct fan accessible to maintenance, cleaning, or repair.

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ACCESSORY INFO

The speed of your in-line duct fan can be controlled with our model VS100 or VS200 speed controls. these speed controls utilize solid-state circuitry to safely adjust the fan speed without damaging the motor. The VS100 mounts inside a standard 2x4 electrical box and includes a cover plate and mounting hardware. The VS200 plugs directly into a a power outlet and will accept a power cord from DB***C models.

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WARNING - NEVER USE A RHEOSTAT OR LIGHT DIMMER SWITCH TO CONTROL YOUR FAN SPEED. A SOLID-STATE SPEED CONTROLLER MUST BE USED TO AVOID DAMAGE TO THE MOTOR.

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MODEL: DB204C

1. Locate the place in the duct where you wish to install the in-line duct fan. Align arrow label on unit in direction of airflow.

FLEXIBLE DUCT

2a. Simply cut the flexible duct and slide the in-line duct fan in place by slipping the cut flexible duct ends over the crimped ends of the in-line duct fan, making sure the unit is well supported. Complete the installation by securing the in-line duct fan to the flexible duct with a good quality aluminum foil duct tape or nylon cable ties.

METAL DUCT

2b. Remove section of the existing ductwork and slide the in-line duct fan in place by slipping the duct ends over the crimped ends of the unit. Complete the installation by securing the in-line duct fan to the metal duct with the supplied #6 sheet metal screws spaced evenly around the circumference on each end of the unit.

3. Finish the installation by covering the seams in the duct with a good quality aluminum foil duct tape.

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MODELS; DB205C, DB206C, DB208C, DB210C

1. Locate the place in the duct where you wish to install the in-line duct fan. Align arrow label on unit in direction of airflow.

FLEXIBLE DUCT

METAL DUCT

3. Finish the installation by covering the seams in the duct with a good quality aluminum foil duct tape.

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CLEANING AND MAINTENANCE

Suncourt recommends that you clean you in-line duct fan at regular intervals, similar to what is recommended for the fan of your furnace, no less than twice a year. Keep your in-line duct fan free of line, dust, and debris. The in-line duct fan must never be exposed to temperatures over 140F.

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ONE YEAR LIMITED WARRANTY

Subject to the following limitations, Suncourt (manufacturer) warrants that the in-line duct fan will, for 1 (one) year from date of original retail purchase, but not exceeding 2 (two) years from date of manufacture, remain free from appearance of defects in workmanship or materials. This warranty is subject to the following limitations: (a) manufacturer's liability is limited to the replacement or repair of the unit, as decided by the manufacturer: (b) a defective unit must be returned, prepaid with proof of purchase, well packaged to avoid damage in transit: and (c) this warranty does not apply to defects resulting from the alteration, abuse accidental damage, unauthorized repair, or misuse of the unit. This warranty is given in lieu of all other warranties, guarantees, and conditions on manufacturer's part, and the manufacturer shall have no tortious or other liability in respect to the in-line duct fan. Ship unit to Suncourt only after obtaining a Return Goods Authorization (RGA) number. Returns without this RGA number will not be accepted. Actual product appearance may differ from illustrations. Suncourt reserves the right to modify any or all of its products' features, designs, components and specifications without notice.