LB2 Dryer Duct Booster for Residential Electric and Gas Clothes Dryers Meets UL 705 DEDPV Requirements / Complies with IRC-2015 佡 Duct lengths are commonly stated in equivalent feet. Most residential clothes dryers are rated for a maximum exhaust duct length of 25 equivalent feet. At 25 equivalent feet or less the dryer’s blower can maintain a proper exhaust velocity to efficiently dry the load of clothing and exhaust lint to the outdoors.
For best performance install the LB2 Booster Fan as directed below Suggested duct layouts for restricted spaces LB2 Minimum Distance from Dryer in Equivalent Feet* Total Duct Length Equivalent Feet* No Secondary Lint Trap With Secondary Lint Trap 4’ from Dryer** 30 15 8 60 30 8 90 35 15 120 40 20 150 45 25 8’ Install Booster Fan no closer than 2 feet from exterior hood. *Equivalent feet equals linear feet plus 5 additional feet for each 90˚ elbow and 2.
Modulating Dryer Duct Boosters for Laundromats and Laundry Rooms 佡 Commercial clothes dryers work best when they are ducted individually to the outdoors. For facilities with many dryers this means multiple holes cut through the wall or roof which is expensive initially and creates many potential points of moisture entry into the building envelope. 佡 One solution is to exhaust multiple dryers into a single duct and termination. But this solves one problem and creates another.
Selecting the proper commercial Dryer Duct Booster duct size Dryers operate most efficiently when exhaust velocities between 1200-2200 feet-per-minute (FPM) are maintained. The number of co-ducted dryers operating, exhaust fan model selection and the diameter and length of the common exhaust duct can dramatically affect exhaust velocity. Follow the recommendations below to maximize the efficiency of the Tjernlund exhaust system and connected dryers.
Dryer Booster System Component Selection CONTROLS REQUIRED ACCESSORIES OPTIONAL ACCESSORIES COP2DB Control N/A IEK8 In-Line Elbow Kit DEVH8 or DEVH12 Vent Hood RT750 Rooftop Exhaust Fan COP2 Control DH750 Discharge Hood with Gravity Damper RTS8 Rooftop Stand RT1500 Rooftop Exhaust Fan COP2 Control DH1500 Discharge Hood with Gravity Damper RTS12 Rooftop Stand BOOSTER MODEL CDB8 Indoor Mount Booster Fan CDB8 Indoor Mount Booster Fan RT750 Rooftop Exhaust Fan For both wall and roof terminated
RT Series Dimensions CDB8 Dimensions Model RT750(H) RT1500(H) A B C Inlet C A 14.5” 14.5” 17.5” 8” 17” 17” 22.5” 12” 23” B 14” Specifications Model Motor HP Motor Amps Motor Volts Ship Weight 16” Specifications RT750(H) RT1500(H) 1/12 1.2 120 54 lbs 1/2 6.2 120 74 lbs Model Motor HP Motor Amps Motor Volts Ship Weight ETL Listed to UL378, UL705 & CAN/CSA B255-M81 Typical common exhaust duct layouts for multiple clothes dryers using Tjernlund Commercial Booster Fans CDB8 1/2 6.
Specified Dryer Exhaust and Make-up Air Systems for large commercial laundries and multi-story chases Tjernlund Specified Systems include a wide range of exhaust and make-up air fans and blowers. Pair with a matching VFD and the CPC-3 Controller to create a demand-based variable speed system that matches your exhaust and/or make-up air needs.
