Page 17
OMNI by EconoHeat
NOTE:
All wall openings directly to outdoors must be screened to prevent entry by birds or
small animals.
Chimney or Vent Requirements
Inspect existing chimney to make sure it is clean, the right size, properly constructed
and in good condition before installing boiler. Failure to do so may cause a
hazardous operating condition.
WARNING
NOTE:
Venting must conform with applicable local codes and National Board of Fire Underwriters.
1. Chimney must be a Class A chimney.
Chimney
Outlet Air Duct
Inlet Air Duct
Note: Each air duct opening shall
have a free area of not less than
one square inch per 2,000 BTU per
hour of the total input rating of all
equipment in the enclosure.*
*If the equipment room is located against an outside
wall and the air openings communicate directly with
the outdoors, each opening shall have a free area of
not less than one square inch per 4,000 BTU per hour of
the total input rating of all equipment in the enclosure.
Figure 14 –
With horizontal ducts
Boiler Model Minimum Breaching
Diameter (inches)
Minimum Recommend
Chimney Diameter (inches)
Minimum Recommend
Chimney Height (feet)
OWB-9
6"
7"
15'
OWB-15
7"
8"
15'
Table 1: Minimum Recommended Breaching and Chimney Size
Note: The inlet
and outlet air
openings shall
each have a free
area of not less
than one square
inch per 4,000
Btu per hour of
total input rating
of all equipment
in the enclosure.
Chimney
Outlet Air
Inlet Air
Ventilation Louvers
(each end of the attic)
Alternative
Air Inlet
Figure 13 –
With vertical ducts
