Appliance Venting Flashcards
All gas fire appliances must be connected to?
Effective vent or chimney
A vent may be any shape
T or F
True
What does ROT stand for
Rule of Thumb
All exterior vents must be ?
Insulated
When do we use the depressurization column
Sizing a vent or chimney in an air tight building
How do we define an exterior chimney?
Any chimney with one or more sides exposed to the outdoors
If we are changing the size of the vent connector for an appliance, where do we make the change?
At the draft hood or flue collar
What is the minimum total vent height for an appliance if we are changing the connector size
10 feet (3m)
An appliance outlet size reduction of more than how many table sizes is not allowed if the appliance outlet size is 12” or under
1 table size
Appliances with a draft hood of what size or smaller cannot be reduced
4”
Do elbows reduce or increase the capacity of the vent or vent connector
Reduce
If we used more than two elbows in a vent connector, each additional elbow will reduce the table capacities by——— for draft hood equipped appliances and ——— for fan-assisted appliances
10% and 15%
When can we assume two elbows are used in the venting of an appliance
When the lateral length is greater than 0
What is a common header referred to as
Common vent connector manifold
Why must table capacity be reduced when we use a common header
Turbulence causes a decrease in venting capacity
A vent connector should not exceed ——- for every ——- of diameter
18” for every 1” of diameter
What do we call the motive force that is used to vent the products of combustion
Convection
The maximum offset for a common vent is ———- for every ——- of diameter
18” for every 1” of diameter
The entire province is considered what altitude ?
High
The sizing for fan-assist appliances will give a ————- and a ————— capacity.
Fan minimum and Fan maximum
Can a fan- assist appliance ever be connected to a masonry chimney
If the appliance has a draft hood
Corrugated metal liner installed in a masonry chimney is considered equivalent to what type of vent.
Type b vent
Because corrugated liner has a rough inner surface, vent table capacities must be reduced by what percent
20%
How do we measure the total height of a common vent serving two or more appliances ?
Highest connected draft hood or flue collar to the level of the rain cap
For appliances in a multi storey installation how do we size the vent connector for the lowest appliance
Sized as a vent for a single appliance
If actual vent height or lateral or connector rises are not found on the tables l, the table must be————- but ———— is not allowed
Interpolated but extrapolation is not allowed
What is the clearance for a single wall vent connector
6”
What is the clearance of a double wall vent connecter
1”
What is the minimum effective height for a vent
5 feet
What is an example of a direct vent appliance
Fireplace
3 examples of checking draft
Match test
Visual inspection
Draft gauges
A space heater installed in bathroom should be of the direct vent type
True or false
True
What’s the minimum distance between a vent terminal and a mechanical air supply of a building
6 feet 1.8 meters
What’s the minimum distance a vent can terminate near any gas regulator
3ft 900 mm
Can a manually operated damper be used in a residential appliance
No
What device is used in a thermally operated damper
Bi metal strip
