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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  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 Broan or BEST exhaust devices do

their  job  more  effectively  and  without  interfering  with  the  proper

operation of other home systems.

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.

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.

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

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.

No. The Broan Automatic Make-Up Air Damper may only be used

with compatible BEST 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.

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.

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.

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.

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