U.S. Boiler Company INDEPENDENCE IN3PV, Installation & Operating Manual

10

NOTICE

The gasketed vent system components pictured below in Figure A are being phased in and each vent component 

is interchangeable with the previously supplied gasket-less venting components. The newer vent components 

are generally quicker and easier to join, as they do not require the sealant application and their clamp bands 

are attached.
In the event a gasketed vent component and a gasket-

less vent component must be interconnected, follow the 

instructions associated with Figure 8B or 8C. The two 

guiding principles of these instructions are as follows:
1)  Any joining of vent components that involves 

     at least one gasket-less vent component 

     always requires the sealant application.
2)  The female end of a gasket-less vent 

      component always requires a clamp band,   

      regardless of the design of the mating male 

      vent component.
Each gasket-less vent component is supplied with a clamp band and sealant.
A Vent Transition Kit, part number 6116302, is available that contains one clamp band and one 3 ounce tube 

of sealant.

Table 7: Maximum Equivalent Vent Length

V. Venting

Figure A:  U.S. Boiler Company Vent

A.

  General Guidelines

1.  Vent system installation must be in accordance with 

National Fuel Gas Code

, NFPA 54/ANSI Z221.3,  

Venting of Equipment, or applicable provisions of 

local building codes. Contact local building or fire 

officials about restrictions and installation inspection 

in your area.

2.  This boiler requires a Special Gas Vent.  The product 

is designed to use supplied AL 29-4C

® 

Stainless 

Steel vent system components.  The following 

manufacturer's offer similar AL 29-4C

®

 components 

and are approved for use with this product:  Heat-

Fab - Saf-T-Vent (800-772-0739); Flex-L 

International - Star-34 (800-561-1980); Protech 

Systems, Inc. - FasNSeal™ (800-766-3473); and Z-

Flex U. S., Inc. - Z-Vent (800-654-5600).  The use 

of these alternate manufacturer's venting systems 

will require adapters to connect to the  supplied vent 

connector and vent terminal.  These adapters are not 

supplied with this boiler and should be obtained 

from the supplier of the alternate manufacturer's 

venting system.  See Table 8 for complete parts list.

WARNING

Do not use this boiler with galvanized, 304 or 316 

stainless steel or any other non AL29-4C

® 

based 

vent systems.

3.  Vent length restrictions are based on equivalent 

length of vent pipe (total length of straight pipe plus 

equivalent length of fittings). Maximum vent length 

is listed in Table 7.  Do not exceed maximum 

lengths.  Minimum vent length is 8 feet. Table 8 lists 

equivalent length for fittings. Do not include Vent 

Terminal in equivalent feet calculation.

4.  Do not install venting system components on the 

exterior of the building except as specifically 

required by these instructions.

B.

Removal of Existing Boiler.

 For installations not 

involving the replacement of an existing boiler, proceed 

to Step C.

When an existing boiler is removed from a common 

venting system, the common venting system is likely 

to be too large for proper venting of the remaining 

appliances. At the time of removal of an existing 

boiler, the following steps shall be followed with each 

appliance remaining connected to the common venting 

system placed in operation, while the other appliances 

remaining connected  to the common venting system 

are not  in operation:
1.  Seal any unused openings in the common venting 

system.

IN3PV

IN4PV

IN5PV

IN6PV

45

35

35

35