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Broan Automatic Make-Up Air Damper Product Guide – 04-17-13 9
The Universal model (MD*TU) can be used with any Broan, NuTone, or BEST range hood.
Communications between the Damper and the Universal model’s pressure sensor at the
exhaust device occur via an independent, hard-wired, low voltage connection.
When an installation requires more than one Damper, Slave models (MD*S) may be specified
for any additional Damper beyond the first, regardless of whether the first Damper is Direct-
Wired, Universal, or LinkLogic™. Communications for Slave models occur over a hard-wired,
low-voltage connection between the upstream Damper and the Slave model.
For the purpose of this Application Guide, the term “Damper” refers to any and all models of the
Broan Automatic Make-Up Air Damper, except where noted otherwise.
5. When to Use the Broan Automatic Make-Up Air Damper
When Required by Code. If your local code requires make-up air to be supplied in
conjunction with a kitchen range hood, use the Broan Automatic Make-Up Air Damper
along with a compatible BEST, NuTone, or Broan range hood).
Tight Homes with Exhaust-based Whole-House Ventilation. In homes which are air-
sealed to limit infiltration, whole-house ventilation systems (such as Broan
SmartSense®, Ultra™, or other models) which use exhaust fans to ventilate, may need
help to introduce outdoor air into the home. The Damper provides this help by providing
a pathway for fresh outdoor air to enter the home when the exhaust system is operating.
Providing this make-up air is especially important in homes with natural draft vented
combustion appliances.
Homes with large range hoods. In homes where the kitchen range hood exhausts a lot of
the home’s air to outdoors, the Damper helps to replace this air by creating an opening
for fresh outdoor air to enter the home when the range hood is operating. Range hoods
with flow rates over 300 cfm are often considered as large range hoods. Providing this
make-up air is especially important in tight homes to allow the range hood to operate
effectively in the removal of smoke and odors, and in homes with natural draft vented
combustion appliances.
Please note: there are other applications in which an unrestricted passive opening or a passive
opening with a different type of damper, such as a barometric or “gravity” damper which opens
under negative pressure, may be called for. The Broan Automatic Make-Up Air Damper is not
intended to be used for supplying combustion air or wired directly to combustion appliances of
any type. Consult your mechanical contractor and local code requirements for applications not
described above. For applications requiring a barometric damper, Broan offers 4” and 6” models
(Broan products BD4 and BD6, respectively).
6. Common Applications
The Broan Automatic Make-Up Air Damper can be used in a variety of applications. Common
applications are listed below, organized by each model of the Damper: LinkLogic™ (SMD*
model), Universal (MD*TU model), Direct-Wired (MD*T model), and Slave (MD*S model).
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