
SPECIFICATION SHEET
Broan-NuTone LLC Hartford, Wisconsin www.broan.com 800-558-1711
REFERENCE QTY. REMARKS Project
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UNIVERSAL
AUTOMATIC
MAKE-UP AIR DAMPER
21C 99044956A
Broan's Universal Automatic Make-up Air
Damper provides interlocked damper operation
so outside air is only allowed to enter the house
when a connected fan or hood is operating.
For use with any Broan or Best hood operating
over 400 CFM.
Model MD6TU (for 6" round duct)
Model MD8TU (for 8" round duct)
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Meets IRC Code M1503.4
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24 Volt, 60 Hz AC motor
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Normally closed damper
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Automatically opens when exhaust fans are activated
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Foam seals minimize air leakage
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24 gauge galvanized steel construction
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Damper adjustment screw for balancing adjustments
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Use with Fresh Air Inlet Model 641FA for 6" dampers
or Fresh Air Inlet Model 643FA for 8" dampers (sold
separately)
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Includes 24 Volt 20VA transformer
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Includes pressure switch kit
Model MD6S (Slave Damper for 6” round duct)
Model MD8S (Slave Damper for 8” round duct)
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Normally closed damper
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Can be ganged together with any Broan Automatic
make-up damper when additional controlled fresh air
inlets/dampers are required to meet make-up air code
requirements.
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For use with all Broan Automatic make-up air systems
(MD6TU, MD8TU, SMD6, SMD8, MD6T/6TR,
MD8T/8TR).
Model MD6S
Model MD6TU
Model MD8S
Model MD8TU
Transformer
Included with
MD6TU & MD8TU
Pressure Switch Kit
Included with
MD6TU & MD8TU
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