Zephyr ZNAE42CS マニュアル

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.

•  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 AK00030 (6”), AK00032 (8”) and AK00052 (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 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.  

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

No

No

Damper  ducted directly 

to a ceiling, floor, or wall 

register

- Motorized Damper
- Transformer
- Pressure Switch Kit which includes:
    - Pressure Switch
    - Probe
- 12” PVC tubing 1/4” I.D.
    - Gasket
- (6) Sheet Metal Screws

- 1/4” Socket Drive
- Flathead or Phillips Screw Driver
- 3/8” Drill Bit
- Duct Tape
- Low Voltage Wire (2 Conductor)
- (2) 1/4” Female Spade Terminals
- Wire Nuts