MACH® Series
Exhaust Vent | 3.6.12 Intake Duct Terminations | |
(Sidewall |
| |
Venting | Roof | |
Requires Up | ||
| ||
Elbow Mounted) |
| |
| Round | |
Air inlet |
| |
(Down Elbow |
| |
Mounted) | 90° Elbow | |
Sidewall |
| |
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.
Sidewall
Air Inlet
(tee mounted horizontally)
Round
No rain cap -
Unrestricted
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.
The roof intake termination must be an unrestrictive type, as shown above.
Page 12
