Chimneys and venting
What is the interior lining of B-vent made of
Aluminum
A type 2 clothes dryers is a _______ appliance
Commercial
Approximately how many threads should be cut on 1 inch pipe
10
Which gas shall not be used for testing
Oxygen
At what height are your required to have inside access to the roof of a building
15 feet
To determine the area (square footage)of a square or rectangle you multiply the ______ times _______
Length x width
What can not go into a B-vent chimney
Solid and liquid fuels
Type 1 clothes dryers ducting systems shall not be assembled with _______
Screws
What is the lowest schedule pipe that can be threaded
Schedule 40
What is standard testing pressure for gas
1.5 times the maximum working pressure, not less than 3 PSI
On 3/4 inch pipe the maximum hanger spacing is what
8 feet
To determine the cubic feet of a room you multiply ________________________
Length x width x height
The maximum length of a single wall vent connector shall be ______ percent of the total height of the chimney
75%
A type 1 clothes dryer is _______ appliance
Residential
On other than dry gas piping systems what is the minimum pitch
1/4 in 15 feet
Testing gauges shall have a range not more than _____ times the test pressure
5 times
Name 2 appliances that do not require sediment traps
Illuminating appliances, gas ranges, clothes dryers, decorative appliances, gas fireplaces and outdoor cooking appliances
To determine the combustion air needed for 100,000 BTUs you divide 100,000 by_________
20
What is the reduction for a corrigated liner in a masonry chimney
20%
A category 1 appliance is what
Natural draft, non condensing
How much exposed pipe should there be on a sediment trap
3 inches
Pipe joints including _____ shall be left exposed for examination
Welds
Undergound tracer wire shall be _____ AWG minimum
14 AWG
Inches of water column is based on 12" equaling_______ psi
.433
What is BW-vent
An oval shaped B-vent
A category 2 appliance is what
Natural draft, condensing
What is the maximum size threaded pipe
4 inch
Persons not involved in the purging operations of gas shall be evacuated from all areas within ______ feet of the point of discharge
10 feet
What type of hose is used to connect laboratory bunsen burners
Unlisted
What is the weight of water
8.33 pounds
How many 90s can be installed in a vent connector before there is a percentage reduction in capacity
2
A category 3 appliance is what
Positive pressure draft, non condensing
What is the minimum cover for underground gas piping
12 inches
At what PSI are you required to purge piping outdoors
Greater than 2 PSI
How far to the edge of a roof must an appliance be installed before a hand rail is required
6 feet
To figure the area of a circle, the equation is_____
Pie (3.14) x radius squared
A chimney penetrating a roof must be _______ feet higher than the nearest _______ foot structure
2 and 10
A category 4 appliance is what
Positive pressure draft, condensing
Hangers for gas pipe shall be made of what material
Metal
When do you need to isolate appliances and equipment from the test
When equipment is designed to run at a higher pressure than the test
Louvers and grill screens mesh shall not be smaller than ____
1/4 inch
A 20x20x10 foot room can accommodate a __________ btu appliance before needing to bring in more combustion air
80,000 BTUs
The flow area of the vertical vent shall not exceed ______ times the flow area of the listed appliance outlet
7x
A high efficiency condensing water heater with a PVC vent is what category
Category 4
What is the maximum PSI for drilling and tapping
5 PSI
Combustion gas indicators shall have a scale from 0 to 100, in _____ percent increments or smaller.
1%
In the 2 permanent openings method, how far must the openings be from the floor and ceiling for combustion air
12 inches
Which gas is heavier than air and which is lighter, propane vs natural
Propane heavier 1.5 specific gravity
Natural lighter .6 specific gravity