Fulton Caliber (CAL) Condensing Hydronic Boiler - Manual (Page 25)

Questions? Please Contact Your Local Manufacturer’s Representative
SECTION 2
CAL-IOM-2014-0129
INSTALLATION
2-19
 Intake Duct Sizing
Adhere to the following:
1. Air intake ducting must be sized in conjunction with the
exhaust venting to provide no greater than a 1.0” W.C.
combined pressure drop. This equates to 70 feet and 8
elbows when combining the distances on the air intake
and exhaust with the piping diameters matching the
standard connections.
2. The installation of a recognized termination screen
is required. Contact your local venting supplier for
assistance in venting sizing.
3. Air Intake pipes and fi ttings shall be Schedule 40
PVC pipe or galvanized steel. All Schedule 40 PVC
pipe, fi ttings, primer and cement must conform
with American National Standard Institute and the
American Society for Testing and Materials (ANSI/ASTM
standards.)
4. Intake PVC piping must be assembled using cement.
This will ensure that the intake is airtight and will not
allow contaminates from the boiler room into the
boiler. The cement shall be free fl owing and contain
no lumps, un-dissolved particles or any foreign matter
that adversely aff ects the joint strength or chemical
resistance of the cement. The cement shall not show
gelation, stratifi cation, or separation that cannot be
removed by stirring.
5. Refer to PVC manufacturer’s requirements for proper
installation.
FIGURE 9 - CHECK VALVE FOR COMMON-VENTED BOILERS
FIGURE 8 - VENTING CONFIGURATIONS