Best MD6T Product Datasheet

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Installs in any electrical box and communicates 

over existing power lines in the home. 

Controls 120VAC to the 24VAC transformer,

causing the damper to open or close as needed 
when ventilation devices are turned on or off

Forms a complete balanced ventilation system by linking Broan  
SmartSense

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 ventilation fans and/or select BEST

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 range hoods using  

the LinkLogic

®

 system.

Heavy duty galvanized steel construction

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Includes 24VAC transformer and a LinkLogic

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enabled make-up air damper control module

Available sizes: 6-inch round (SMD6) and  

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8-inch round (SMD8) normally closed

Link Logic

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®

 system uses existing AC wiring to 

communicate between damper control and  
ventilation devices and requires no added wiring

Installation (see below)

Insert within a 6-inch or 8-inch duct running

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from an exterior wall to the cold air return of  
a forced-air system

If there is no forced air return, the make-up air 

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duct can be run to a wall or ceiling register in a 
location that minimizes concerns about drafts and 
maintains 5' separation from the cook appliance 
or hood

Damper assemblies can be “ganged” for high 

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volume applications

Ganged dampers open and close simultaneously

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Transformer and make-up air control are easily 

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installed adjacent to the Make-Up Air Damper

Balances indoor air pressure by providing make-up air for select BEST

®

or Broan

® 

range hoods.

Heavy duty galvanized steel construction

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Includes 24VAC transformer

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Available sizes: 6-inch round (MD6T) and  

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8-inch round (MD8T)

Two convenient models:

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- MDT is designed for devices with a  
switched 120VAC output or dry contact

   

- MDTR is designed for devices with  
a switched 12VDC output

 

 

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 Includes low voltage relay module

Installation (see below)

Insert within a 6-inch or 8-inch duct running

•

from an exterior wall to the cold air return of  
a forced-air system

If there is no forced air return, the make-up air 

•

duct can be run to a wall or ceiling register in a 
location that minimizes concerns about drafts and 
maintains 5' separation from the cook appliance 
or hood

Damper assemblies can be “ganged” for high 

•

volume applications

Ganged dampers open and close simultaneously

•

Low-voltage wiring transmits open/close signal  

•

to the make-up air damper

Economical, ruggedly constructed  

•

galvanized motorized damper
SMD6 and SMD8 are designed for use with

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Broan SmartSense ventilation fans and select  
BEST range hoods
MD6T, MD8T, MD6TR and MD8TR are designed

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for select BEST and Broan range hoods
Can be controlled by more than one Broan  

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or BEST ventilation product

Damper opens automatically to replace 

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the air being exhausted by ventilation fans 
or range hoods, and then closes tightly 
when ventilation fans are turned off
Prevents excess air from entering the

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home during heating or cooling calls, 
reducing energy consumption