Intake Duct Materials And Sizes; Sealing The Intake Duct; Intake Duct Connection To Boiler; Intake Duct Terminations - Patterson-Kelley MACH-05 Installation Manual

MACH® Series Gas-Fired Boiler
C750/900/1050 Sidewall Inlet and Vent

3.6.9 Intake Duct Materials and Sizes:

Material: PVC, CPVC (Schedule 40), single wall
galvanized steel, or other suitable materials.
The intake duct must be sized for a maximum pressure
drop of 0.22 inches W.C., for the SCFM as specified
below.
Boiler Size
1050
900
750
450
300
The installation of a bird screen on the intake
termination is recommended.

3.6.10 Sealing the Intake Duct

Proper sealing of the intake ductwork is necessary to
prevent infiltration of air from conditioned space.
Joints in PVC or CPVC must be cemented. For
galvanized duct, wrap each joint and seam with
adhesive aluminum tape.

3.6.11 Intake Duct Connection to Boiler

Connect the air supply duct to the collar on the back of
the boiler. Fasten the duct to the collar with sheet
metal screws at 90º angles. Seal the joint.
Exhaust Vent
(Sidewall
Venting
Requires Up
Elbow Mounted)
Air inlet
(Down Elbow
Mounted)
Sidewall
Required SCFM
245
210
175
105
70

3.6.12 Intake Duct Terminations

The roof intake termination must be an
unrestrictive type, as shown above.
Page 12
Installation
Roof
90° Elbow
Sidewall
Round
No rain cap -
Unrestricted
Round
Air Inlet
(tee mounted
horizontally)