Bosch WR430-7K - Manuel (Page 7)

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Bosch POWER VENTING SYSTEM
GENERAL VENTING INFORMATION - continued
APPROVED VENTING MATERIALS:
Single wall:
As gauge listed in the current CAN1/CGA B149 installation code for gas burning appliances (for Canada),
National Fuel Code ANSI Z223.1-LATEST (for USA).
Note: Cannot be used in concealed locations.
B-Vent materials:
Straight lengths only (no elbow) may be used under following conditions
(i)
Unsealed 5” B-vent may be used as a chase for sealed 4” single wall through concealed or unheated
areas.
Clearances to combustible materials for walls and partitions:
• 1” (25mm) for B-Vent.
• 3” (76mm) for single wall and uninsulated PVS-1 vent piping.
A wall thimble must be installed for internal wall applications.
All runs through unheated space or exposed to outside temperatures must be insulated to prevent condensation.
All portions of the vent system under positive pressure during operation (on the outlet side of the WR430-7K)
shall be sealed with high temperature silicone and high temperature aluminum duct tape and installed so as to
prevent leakage of flue or vent gases into building.
GENERAL CODE REQUIREMENTS
Before commencing an installation always consult with local gas and electrical codes and authorities, in the
absence must be installed:
• With the current CAN1/CGA B149 installation code for gas burning appliances and the Canadian Electrical
code C22.1-M90 part 1 (for Canada).
• With the National Fuel Code and the ANSI Z223.1-LATEST and National Electrical Code ANSI/NFPA No 70-
LATEST electrical code (for USA).