BROAN-NUTONE MD6T, MD8T, MD10T INSTRUCTIONS
AUTOMATIC
MODELS MD6T • MD8T • MD10T
Page 1
MAKE-UP AIR DAMPER
WITH TRANSFORMER
READ AND SAVE THESE INSTRUCTIONS
FOR RESIDENTIAL USE ONLY
WARNING
TO REDUCE THE RISK OF FIRE, ELECTRIC SHOCK, OR
INJURY TO PERSONS, OBSERVE THE FOLLOWING:
1. Installation work and electrical wiring must be done by a qualified
person(s) in accordance with all applicable codes and standards,
including fire-rated construction codes and standards.
2. Do not use the unit in conjunction with any exhaust device other
than compatible BEST, Broan Elite or Broan range hoods.
3. This unit is not designed to provide combustion air for fuelburning appliances.
4. Do not connect the unit directly to a combustion appliance of
any type.
5. Sufficient air is needed for proper combustion and exhausting
of gases through the flue (chimney) of fuel burning equipment
to prevent backdrafting. Follow the heating equipment
manufacturer’s guideline and safety standards such as those
published by the National Fire Protection Association (NFPA),
and the American Society for Heating, Refrigeration and
Air Conditioning Engineers (ASHRAE), and the local code
authorities.
6. Before servicing or cleaning unit, switch power off at service
panel and lock the service disconnecting means to prevent
power from being switched on accidentally. When the service
disconnecting means cannot be locked, securely fasten a
prominent warning device, such as a tag, to the service panel.
7. When performing installation, servicing or cleaning the unit, it is
recommended to wear safety glasses and gloves.
8. During extreme weather events including snow storms, ensure
that the intake area for the outside air duct is not blocked and
able to provide a clear pathway for outside air to enter the
system.
9. When cutting or drilling into wall or ceiling, do not damage
electrical wiring or other hidden utilities.
10. When notching or drilling into framing including floor supports,
rim joists, and wall studs, comply with code and manufacturer
limitations on allowable modifications to these structural
members.
11. This unit is intended to be installed within the home in a location
protected from moisture.
12. This unit must be in an accessible location which allows for
inspection of the unit.
13. Use this unit only in the manner intended by the manufacturer.
If you have questions, contact the manufacturer at the address
or telephone number listed in this document.
14. When federal, provincial or state legislation comprises more
restrictive installation and/or certification requirements, the
aforementioned requirements prevail on those of this document
and the installer agrees to conform to these at his own expense.
To register this product
visit: www.broan.com
CAUTION
1. Do not locate outside air inlet near hazardous materials or
explosives.
2. Unit shall not be installed to introduce air from crawlspaces,
garages, attics, adjacent dwelling units, or other locations within
the building shell. Unit shall be installed to introduce air directly
from outdoors.
3. Do not run the outside air duct directly above or closer than 2 ft to
any furnace or its supply plenum, boiler, or other heat producing
appliance.
4. Any ductwork used in conjunction with the Damper must be
installed in compliance with all local and national codes that are
applicable.
5. Do not operate the Damper for fresh air introduction until all system
filters, including the central duct system filter, have been installed
per the system design.
6. Please read the unit specification label on the product for further
information and requirements.
7. The Damper’s outdoor air intake, ducting, and any filters should be
inspected and maintained on a regular basis.
8. Insulate the duct and damper to prevent build-up of condensation
in cold weather climates. Vapor barriers on both sides of insulation
are recommended.
PLAN THE INSTALLATION
Planning the installation first requires selecting the most appropriate
installation approach. The chart below offers suggestions for the most
effective installation approach by considering a few important factors.
Further details on the two main types of installations are provided below.
MODELS MD6T • MD8T • MD10T
Page 2
• Outside air intake is placed high enough above grade to prevent
blockage from snow or other debris such as leaves, and at a minimum of 1’ above grade.
• Make-up air damper should not draw air from crawlspaces, garages, attics, adjacent dwelling units, or any enclosed part of the
building. The Damper should be installed to draw air directly from
outdoors.
• House has central duct work?
Yes
• Return-air side of duct work is
accessible -either the return-air trunk
Yes
Damper connected to
return side of central
duct system
or return- air plenum?
No
No
Damper ducted directly
to a ceiling, floor, or wall
register
OUTSIDE AIR INTAKE LOCATION
Proper design and location of the outside air intake location is critical in
ensuring that the Damper can safely and reliably provide an opening for
fresh air to enter the home. The following requirements for the location
of the outside air intake must be met:
• Outside air intake is located a minimum of 10’ from combustion appliance vents, chimneys, plumbing stacks, and bathroom or kitchen
exhaust vents. If local codes have more stringent separation requirements, they shall apply.
TYPICAL INSTALLATIONS
OUTSIDE AIR INTAKE OPENING PROTECTION
Because the Damper, together with the end cap and outside air duct
which are installed with it, will allow outdoor air into the indoor environment, it is important to meet the following requirements:
• Model 641FA (6”), 643FA (8”) and 610FA (10”) fresh air inlet wall
caps include protective bird screens to keep out animals and outside debris. Clean screens often and do not remove.
• If a protective bird screen other than the screen provided is used, it
must cover the entire opening of the outside air duct. This screen
must also have openings of at least ¼” but no larger than ½”.
• The outdoor air intake opening should meet local code provisions
for the protection of openings in exterior walls, including steps to
prevent moisture intrusion around the opening.
Note that the screen over the outside air opening is not a filter. It is
intended to prevent the intake of leaves, animals, or debris into the outside air duct. A downstream filter is necessary to remove pollen, dust,
and other airborne particles. Potential filter locations are shown below
in the Typical Installations section.
MINIMUM RETURN AIR TEMPERATURE REQUIREMENTS
HVAC equipment manufacturers may have minimum requirements for
the air temperature in the return air plenum. Introducing outdoor air to
the return side of the central duct system may impact this temperature.
The installer should adjust both the size of the outside air duct and the
location of its connection to the return side of the central duct system in
a manner so that minimum air temperature requirements are satisfied
under design conditions.
Installations will vary according to the location in the home where the unit is installed and which model Damper is used. Use the following
illustrations and notes as guidance for your own installation. Always comply with local code requirements and in any instance where a detail
shown below conflicts with local code, the local code provision shall apply.
CENTRAL SYSTEM SUPPLY AIR
THERMOSTAT
AIR DISTRIBUTION FAN
AIR HANDLER UNIT
EXTERIOR WALL
CENTRAL SYSTEM RETURN AIR
INSULATED OUTSIDE
AIR DUCT (slope toward wall cap)
FRESH AIR INLET WALL CAP
WITH BIRD SCREEN
VENTILATION AIR INTAKE
(locate away from pollutant sources)
FIELD MEASUREMENT OF AVAILABLE
STATIC PRESSURE. (See “Install The
Damper” section on page 3 for damper
balancing instructions.)
AUTO. MAKE-UP AIR DAMPER
REGISTER BOX ADAPTED
WITH SLIDE-IN FILTER (optional)
CENTRAL DUCT SYSTEM FILTER
Damper connected to return side of central duct system.
MODELS MD6T • MD8T • MD10T
Page 3
EXTERIOR WALL
INTERIOR WALL
WALL
REGISTER
Damper and outside air duct connected directly to a ceiling, floor, or wall register.
INSTALL THE DAMPER
TO CENTRAL SYSTEM
RETURN AIR OR INTERIOR
WALL REGISTER
AIR FLOW AIR FLOW
DAMPER FLAP (Install in
vertical position shown.)
Install the damper as shown. Make sure damper flap is in a vertical
position when closed and power is off. The set screw can be used
to adjust the damper opening - thereby balancing the inside and
outside air pressure when the range hood exhausts at high speed.
SET SCREW
OUTSIDE AIR
MAKE-UP AIR
DAMPER
LOW VOLTAGE CONNECTION
GRD
120 VAC
60 HZ
INSULATED OUTSIDE
AIR DUCT (slope toward wall cap)
WALL CAP WITH
BIRD SCREEN
VENTILATION AIR INTAKE
(locate away from pollutant sources)
MOTORIZED DAMPER
REGISTER BOX ADAPTED
WITH SLIDE-IN FILTER (optional)
MODEL EW56, EW58, EI59,
QP3, QP4, P195P & WTT32I SERIES
MAKE UP DAMPER CONNECTION
(switched low voltage)
20 GAUGE BELL WIRE FOR
ON BACK OF HOOD
24V
TRANSFORMER
(included)
DRY CONTACT
TERMINAL BUSHING ON HOOD FOR LOW VOLTAGE CONNECTION
Wire the system as shown.
MAKE-UP AIR
DAMPER
24V
TRANSFORMER
MODEL E60000 SERIES & E64000 SERIES
MAKE-UP AIR DAMPER CONNECTION
WHT
BLK
24V
(included)
(switched high voltage)
WHT WHT
ORG
WHT
BLK
BLK
HOOD
BLK
GRD
120 VAC
60 HZ
MAKE-UP AIR DAMPER
GRD
120 VAC
60 HZ
MAKE UP DAMPER CONNECTION
24V
TRANSFORMER
(INCLUDED)
MODEL CC34IQSB
(switched low voltage)
20 GAUGE BELL WIRE FOR LOW
VOLTAGE CONNECTION ON
TOP OF HOOD
WIRE BOX
FOR LOW
VOLTAGE
CONNECTION
HOOD
MODELS MD6T • MD8T • MD10T
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SYSTEM OPERATION
Once the Damper and the associated BEST, Broan Elite or Broan
exhaust devices are installed, the installer should confirm that the
Damper opens and closes in conjunction with signals from the
exhaust devices(s) as intended.
A qualified HVAC contractor should also ensure the proper
operation and venting of all combustion equipment in the home.
MAINTENANCE
Regular maintenance is necessary to ensure the proper operation
of the Damper system. Failure to conduct such routine maintenance
can jeopardize the ability of the Damper to introduce fresh air into the
home. Regular maintenance should include the following activities:
• Clean the outside bird screen to ensure it is free from debris and
open to allow fresh air to enter.
• Clean or replace the interior filter(s) which serve to filter fresh air
before it enters the home.
• Maintain a clear opening at the outdoor end cap, which means preventing the buildup of snow, leaves, or vegetation at the end cap.
• During regular HVAC maintenance, have the mechanical contractor inspect the Damper system for proper operation.
FREQUENTLY ASKED
QUESTIONS (FAQS)
1. What does the Broan Automatic Make-Up Air
Damper do?
The Broan Automatic Make-Up Air Damper (the “Damper”) provides a
pathway for fresh air to enter a home from outdoors when a compatible
exhaust device is operating. The Damper opens when a compatible BEST,
Broan Elite or Broan range hood is operating, thereby creating a known,
controlled point for fresh air to enter the home while air is being exhausted
from the building by the range hood.
By operating in this manner, the Damper provides two key benefits for the
home:
• It facilitates air exchange between indoors and outdoors, by helping to
allow fresh air into the home to replace air which is exhausted out of
the home.
• By allowing fresh air into the building when a compatible exhaust device
is on, the Damper helps to avoid negative pressure conditions within
the home which may interfere with the proper operation of combustion
equipment within the home.
Overall, the Damper let’s your BEST, Broan Elite or Broan exhaust
devices do their job more effectively and without interfering with the proper
operation of other home systems.
2. Does the “Damper” provide combustion air for combustion
appliances like a water heater or
a furnace?
No. The Damper helps to replace air which is exhausted by a compatible
range hood. But it does NOT help to replace air which is drawn from the
indoors by a combustion appliance like a natural gas water heater, and it
should not be relied upon to perform this function. One main reason for
this restriction is that the Damper is only open when the range hood that
it’s connected to is operating. So there is no assurance that the Damper
would be open when other appliances, like a water heater, are operating.
Other means must be provided to ensure adequate combustion air for
these appliances.
3. How do I know if I need make-up air for my
range hood?
In some cases the local building code may tell you that make-up air is
necessary. For example, some codes specify that range hoods with
exhaust flows of 300 cubic feet per minute (CFM) or higher need a
mechanical system to introduce make-up air.
In other cases, make-up air for a range hood is desirable regardless of
whether code requires it. This is especially true for:
• larger range hoods (those over 300 cfm)
• homes which are well air-sealed - so outside air may not be able to
easily find its way into the home through cracks, to replace air which is
exhausted out
• homes with atmospherically vented combustion appliances
(i.e. a water heater or natural draft fireplace), which are more
susceptible to improper venting if depressurization occurs in
the home.
In homes with any one of these factors make-up air is advised. And in
homes with more than one of these conditions make-up air for the range
hood is strongly advised.
4. What are the benefits of providing make-up air to replace air
which is exhausted out of the home by a range hood?
Range hoods are designed to pull out pollutants like cooking odors or
moisture at the source, so they don’t linger in the home. Because these
fans pull air out of the house, this air needs to be replaced with “new” air
from outdoors. Normally this make-up air enters the home through cracks
and holes in the “shell” of the building. But modern homes are air-sealed
much more thoroughly so there are not as many cracks and openings.
Plus some exhaust fans like range hoods exhaust a lot more air than can
be replaced through normal cracks in the building shell.
By providing an intentionally designed opening for fresh air to replace
air which is exhausted out by the range hood, several important benefits
result:
• The make-up air entering the home comes in at a known point, where
it is also filtered
• Negative pressure conditions, which could arise if air is exhausted from
a home without being replaced by new fresh air, are prevented
• Pollutants are more effectively exhausted from the home while fresh
replacement air is drawn into the home, improving ventilation
MODELS MD6T • MD8T • MD10T
Page 5
5. Does ASHRAE 62.2-2007 – “Ventilation and Acceptable Indoor
Air Quality in Low-Rise Residential Buildings” – require the use
of a make-up air damper?
ASHRAE 62.2-2007 does not specifically require make-up air dampers.
In a few limited circumstances, this standard does require that net
exhaust flows from a house be limited. For example, Section 6.4 of the
standard limits the net exhaust flow from a home’s two largest exhaust
appliances if the home has atmospherically vented or solid-fuel burning
appliances located within the pressure boundary of the house. This
standard is available at www.ashrae.org.
6. Can I use the Broan Automatic Make-Up Air Damper with other
equipment in my home?
No. The Broan Automatic Make-Up Air Damper may only be used with
compatible BEST, Broan Elite or Broan range hoods. More information
on exact models of the Damper and compatible exhaust devices can be
found in the Broan Automatic Make-Up Air Damper Application Guide.
7. What are the different ways that the Damper can be installed in
my home?
The most common way to install the Damper is to connect it to a home’s
central duct system. In this application, outside fresh air enters the
home through the Damper and is then routed and distributed through
the home’s ducts. More information on this installation approach can be
found in the Broan Automatic Make-Up Air Damper Application Guide on
our web site: www.broan.com.
8. What if my home doesn’t have ducts?
Homes without ducts can still utilize the Damper to help replace air which
is exhausted from the home by the range hood. An installation illustration
for this situation is included in the Broan Automatic Make-Up Air Damper
Application Guide on our web site: www.broan.com.
9. What happens after a power outage?
The Damper system and the associated exhaust devices will not lose
their settings following a power outage. So the system will resume its
normal operation following a power outage, based on the settings it used
prior to the outage.
WARRANTY
BROAN-NUTONE ONE YEAR LIMITED WARRANTY
Broan-NuTone warrants to the original consumer purchaser of its products that such products will be free from defects in materials or workmanship for
a period of one year from the date of original purchase. THERE ARE NO OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED
TO, IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
During this one-year period, Broan-NuTone will, at its option, repair or replace, without charge, any product or part which is found to be defective under
normal use and service.
THIS WARRANTY DOES NOT EXTEND TO FLUORESCENT LAMP STARTERS, TUBES, HALOGEN AND INCANDESCENT BULBS, FUSES, FILTERS, DUCTS,
ROOF CAPS, WALL CAPS AND OTHER ACCESSORIES FOR DUCTING. This warranty does not cover (a) normal maintenance and service or (b) any
products or parts which have been subject to misuse, negligence, accident, improper maintenance or repair (other than by Broan-NuTone), faulty installation or installation contrary to recommended installation instructions.
The duration of any implied warranty is limited to the one-year period as specified for the express warranty. Some states do not allow limitation on how
long an implied warranty lasts, so the above limitation may not apply to you.
BROAN-NUTONE’S OBLIGATION TO REPAIR OR REPLACE, AT BROAN-NUTONE’S OPTION, SHALL BE THE PURCHASER’S SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY. BROAN-NUTONE SHALL NOT BE LIABLE FOR INCIDENTAL, CONSEQUENTIAL OR SPECIAL DAMAGES ARISING OUT
OF OR IN CONNECTION WITH PRODUCT USE OR PERFORMANCE. Some states do not allow the exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights, which vary from state to state. This warranty supersedes all prior
warranties.
To qualify for warranty service, you must (a) notify Broan-NuTone at the address or telephone number below, (b) give the model number and part
identification and (c) describe the nature of any defect in the product or part. At the time of requesting warranty service, you must present evidence of
the original purchase date.
Broan-NuTone LLC, 926 W. State Street, Hartford, Wisconsin 53027 www.broan.com 800-558-1711
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