A
HE, DE & RE MANUAL
IOM-26
13 of 33
Oct 12 R4
NON RECIRCULATING INSTALLATION REQUIREMENTS
For Non Recirculating applications, all air to this unit must be drawn directly from the outdoors.
Recirculation of room or building air is not permitted.
The outside air intake of the make-up air unit shall be located in accordance with local building code
provisions for ventilation air. Not withstanding those requirements the intake should be located as far as
possible away from any exhaust discharge,
plumbing vent or other source of contaminants in
order to prevent the induction of contaminants.
The outside air intake of the make-up air unit shall
not be located within 20 ft (6 m) horizontally of the
vertical plane in which combustible gas, vapor or
dust is present.
This equipment shall be installed so that in the
event the make-up air shut down causes a hazard
to other fuel burning equipment in the building, the
unit shall be interlocked to open balancing inlet air
dampers or equivalent.
INLET DUCTING
A pre-purge cycle shall be used to provide at least
four air changes in the ducting before an ignition
attempt.
Units with ducted outside air inlet shall have straight
duct directly attached to the unit of a length at least
1½ times the unit height or 2 times the unit width,
which ever is greater.
Field constructed intake accessories should be
properly designed to minimize the entry of snow
and rain. If there is doubt about the installation of
this product with respect to the application, contact
Engineered Air.
