P-K SOLIS™
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: March 15, 2021
Released: March 15, 2021
Patterson-Kelley 2021
All Rights Reserved.
2701000090 P-K SOLIS NURO Installation and
Owners Manual (Rev A).docx
Page 31
Sealed Combustion/Direct Vent Systems
These boilers are also certified for operation with a sealed combustion air and pressurized venting
system. Such a system employs a sealed combustion
air intake duct leading from outdoors and a sealed
exhaust vent terminating outdoors. Air flow through the system is maintained by the combustion air fan.
Allowable configurations of vent and air intake terminations are illustrated below.
The combined pressure drop of the air supply duct and exhaust vent must not exceed 0.44” W.C. This
pressure drop includes both the inlet and exhaust duct friction loss. If the air inlet and the exhaust vent
terminate on the same wall of the building they must utilize the same type of termination fitting. Allowable
termination fittings are either 90° elbows or tees. This boiler may be installed with sidewall vent using
room air, see
3.4.1
.
NOTE
Drains have been omitted for clarity. The exhaust vent must be at least 3 feet above the air intake.
The air intake and exhaust vent must extend 6" to 12" from the exterior wall and be offset. The inlet air
duct loss should not exceed 0.22” W.C
.
12” Minimum
36”
Minimum
Air Inlet
Exhaust
Vent