Broan MD8T Guide d'installation télécharger pdf (Page 2)

MODELS MD6T • MD8T • MD10T

Page 2

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 ap-

pliance vents, chimneys, plumbing stacks, and bathroom or kitchen

exhaust vents. If local codes have more stringent separation re-

quirements, they shall apply.

TYPICAL INSTALLATIONS

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.

Damper connected to return side of central duct system.

• Outside air intake is placed high enough above grade to prevent

blockage from snow or other debris such as leaves, and at a mini-

mum of 1’ above grade.

• Make-up air damper should not draw air from crawlspaces, ga-

rages, attics, adjacent dwelling units, or any enclosed part of the

building. The Damper should be installed to draw air directly from

outdoors.

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 environ-

ment, 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 out-

side 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 out-

side 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.

AIR HANDLER UNIT

AIR DISTRIBUTION FAN

THERMOSTAT

CENTRAL SYSTEM SUPPLY AIR

WITH SLIDE-IN FILTER (optional)

AUTO. MAKE-UP AIR DAMPER

FIELD MEASUREMENT OF AVAILABLE

STATIC PRESSURE. (See “Install The

Damper” section on page 3 for damper

balancing instructions.)

FRESH AIR INLET WALL CAP

WITH BIRD SCREEN

INSULATED OUTSIDE

AIR DUCT (slope toward wall cap)

EXTERIOR WALL

VENTILATION AIR INTAKE

(locate away from pollutant sources)

CENTRAL SYSTEM RETURN AIR

CENTRAL DUCT SYSTEM FILTER

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.

Yes

• House has central duct work?

Yes

• Return-air side of duct work is

accessible -either the return-air trunk

or return- air plenum?

Damper connected to

return side of central

duct system

Damper ducted directly

to a ceiling, floor, or wall

1 2 3 4 5 6 7 ... 15 16

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Broan MD8T Guide d'installation Page 2

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