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MACH® Series
Gas-Fired Boiler Installation
Page 12
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 Required SCFM
1050 245
900 210
750 175
450 105
300 70
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.
3.6.12 Intake Duct Terminations
The roof intake termination must be an
unrestrictive type, as shown above.
Roof
Round
90° Elbow
Sidewall
Round
Air Inlet
(tee mounted
horizontally)
No rain cap -
Unrestricted
Sidewall
Air inlet
(Down Elbow
Mounted)
Exhaust Vent
(Sidewall
Venting
Requires Up
Elbow Mounted)