B149.1 Annex C & D & E & F Flashcards
(15 cards)
What is in Annex C
Vent sizing tables for Category I natural gas and propane
appliances
What are c.1-c.2
GG
General
General venting requirements (GVRs)
How many 90s are assumed in the vent system using the tables
2
What is done if 3 elbows are used instead of 2
For each additional 90° turn or its equivalent*,
the maximum capacity of each individual vent connector listed in the venting table should be reduced
by 10% (calculated as 0.90 × maximum listed capacity) for a natural draft appliance and 15% for a fan-
assisted appliance.
If vent connectors are combined prior to entering the common vent, the maximum common vent
capacity listed in the common venting tables shall be reduced by what AND what is the maximum horizontal
by 10%
should not exceed 1-1/2 ft (457 mm) for each inch (25.4 mm) of
common vent connector manifold diameter.
If the common vertical vent is offset the maximum common vent capacity
listed in the common venting tables should be reduced by what
20%
What are tables C.1-C.4 for
c.1-c.2 single appliances
c.3-c.4 multiple appliances
venting sizing
What is Table C.5 and c.6 for
Capacity of tile-lined masonry chimneys with Type B double-wall vent connectors
serving a single Category I appliance
Single-wall vent connectors
What is Table C.7 for
Capacity of tile-lined masonry chimneys with double-wall vent connectors serving two or more Category I appliances
Single-wall vent connectors
What is table c.9 for
Single-wall vent connector total length limits for multiple appliance installations
What is table c.10 for
Masonry chimney liner dimensions with circular equivalents
What is c.12 for
Principles of design of multi-storey vents using vent connector
and common vent design tables
What is Annex D
Customer’s meter and service regulator installations
What is Annex E
Example of piping design sizing (imperial and metric
What is Annex F
Suggested general dimensions for draft hoods
