SIZING: DFU, WSFU, VENT, BTU Flashcards
Maximum units for 1-1/4” drainage piping if draining vertically
1 Unit
Maximum units for 1-1/4” drainage piping if draining horizontally
1 Unit
Maximum units for 1-1/2” drainage piping if draining vertically
2 units (Except sinks, urinals, and dishwashers exceeding 1 fixture unit)
Maximum units for 1-1/2” drainage piping if draining horizontally
1 unit
Maximum units for 2” drainage piping if draining vertically
16 units (except six-unit traps or water closets)
Maximum units for 2” drainage piping if draining horizontally
8 units (except six-unit traps or water closets)
Maximum units for 3” drainage piping if draining vertically
48 units (only 4 water closets or six-unit traps allowed on a vertical pipe or stack)
Maximum units for 3” drainage piping if draining horizontally
35 units (not to exceed 3 water closets or six-unit traps on a horizontal branch or drain)
Maximum units for 4” drainage piping if draining horizontally
216 units (based on 1/4” per foot slope. For 1/8” per foot slope, multiply fixture units by a factor of 0.8)
Maximum units for 4” drainage piping if draining vertically
256 units
True or False: There is no maximum length for drainage piping in a horizontal orientation.
True. Maximum horizontal length for drainage piping is unlimited.
What is the maximum length allowed for 1-1/4” drainage piping in a vertical orientation?
45 feet
What is the maximum length allowed for 1-1/2” drainage piping in a vertical orientation?
65 feet
What is the maximum length allowed for 2” drainage piping in a vertical orientation?
85 feet
What is the maximum length allowed for 3” drainage piping in a vertical orientation?
212 feet
What is the maximum length allowed for 4” drainage piping in a vertical orientation?
300 feet.
True or false?
In vent piping, both the horizontal and vertical carry the same values for maximum length and maximum units.
True.
Maximum venting units for 1-1/4” pipe?
1 unit
Maximum venting units for 1-1/2” pipe?
8 units. (Except six-unit traps or water closets)
Maximum venting units for 2” pipe?
24 units
Maximum venting units for 3” pipe?
84 units
Maximum venting units for 4” pipe?
256 units (same as the vertical drainage units for 4”)
Maximum length in feet for 1-1/4” vent piping
45 feet
Maximum length in feet for 1-1/2” vent piping
60 feet
Maximum length in feet for 2” vent piping
120 feet
Maximum length in feet for 3” vent piping
212 feet
Maximum length in feet for 4” vent piping
300 feet
Maximum DFU for a trap and trap arm in 1-1/4”
1unit
Maximum DFU for a trap and trap arm in 1-1/2”
3 units
Maximum DFU for a trap and trap arm in 2”
4 units
Maximum DFU for a trap and trap arm in 3”
6 units
Maximum DFU for a trap and trap arm in 4”
8 units
What is the equivalent fixture unit value for “Up to 7-1/2 GPM” in intermittent discharge capacity?
Equals 1 fixture unit
What is the equivalent fixture unit value for “greater than 7-1/2 to 15 GPM” in intermittent discharge capacity?
Equals 2 fixture units
What is the equivalent fixture unit value for “greater than 15 to 30 GPM” in intermittent discharge capacity?
Equals 4 fixture units
What is the equivalent fixture unit value for “greater than 30 to 50 GPM” in intermittent discharge capacity?
Equals 6 fixture units.
What is the minimum size trap and trap arm for a bathtub or combination bath/shower?
1-1/2”
What is the minimum size trap and trap arm for a clothes washer, domestic, standpipe?
2”
What is the minimum size trap and trap arm for a drinking fountain or water cooler?
1-1/4”
What is the minimum size trap and trap arm for a floor drain?
2”
What is the minimum size trap and trap arm for a shower?
2”
What is the minimum size trap and trap arm for a lavatory?
1-1/4”
What is the minimum size trap and trap arm for a bar sink?
1-1/2”
What is the minimum size trap and trap arm for a commercial sink with food waste?
1-1/2”
What is the minimum size trap and trap arm for a kitchen sink, domestic?
1-1/2”
What is the minimum size trap and trap arm for a laundry sink?
1-1/2”
What is the minimum size trap and trap arm for a urinal, integral trap?
2”
What is the minimum size trap and trap arm for a water closet?
3”
What is the drainage fixture unit value for a bathtub or combination bath/shower?
2.0 DFU
What is the drainage fixture unit value for a bidet with a 1-1/4” trap?
1 DFU
What is the drainage fixture unit value for a bidet with a 1-1/2” trap?
2.0 DFU
What is the drainage fixture unit value for a clothes washer, domestic, standpipe?
3.0 DFU
What is the drainage fixture unit value for a dishwasher, domestic, with independent drain?
2.0 DFU
What is the drainage fixture unit value for a drinking fountain/water cooler?
0.5 DFU
What is the drainage fixture unit value for floor drain?
2.0 DFU
What is the drainage fixture unit value for shower, single-head trap?
2.0 DFU
What is the drainage fixture unit value for each additional shower head in a multi-head shower?
1.0 DFU
What is the drainage fixture unit value for a lavatory?
1.0 DFU
What is the drainage fixture unit value for a bar sink?
1.0 DFU
What is the drainage fixture unit value for a kitchen sink?
2.0 DFU
What is the drainage fixture unit value for a laundry sink?
2.0 DFU
What is the drainage fixture unit value for a urinal?
2.0 DFU
What is the drainage fixture unit value for a water closet with a 1.6GPF tank or flushometer valve?
3.0 private, 4.0 public
What is the drainage fixture unit value for a water closet with a greater than 1.6 GPF tank or flushometer valve?
4.0 private, 6.0 public
What is the minimum allowed fixture branch pipe size, in inches, for a bathtub or combination bath/shower?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a bidet?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a clothes washer? (WSFU)
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a dishwasher?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a drinking fountain or water cooler?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a hose bibb?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a lavatory?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for any kind of sink?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a shower head?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a urinal with a flushometer valve?
3/4”
What is the minimum allowed fixture branch pipe size, in inches, for a urinal with a flush tank?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a tank-style water closet?
1/2”
What is the minimum allowed fixture branch pipe size, in inches, for a water closet, flushometer valve?
1”
What is the Water Supply Fixture Unit value for a bathtub or combination bath/shower?
4.0 WSFU
What is the Water Supply Fixture Unit value for a bidet?
1.0 WSFU
What is the Water Supply Fixture Unit value for a clothes washer?
4.0 WSFU
What is the Water Supply Fixture Unit value for a dishwasher, domestic?
1.5 WSFU
What is the Water Supply Fixture Unit value for a drinking fountain or water cooler?
0.5 WSFU
What is the Water Supply Fixture Unit value for a hose Bibb?
2.5 WSFU
What is the Water Supply Fixture Unit value for each additional hose Bibb?
1.0 WSFU
What is the Water Supply Fixture Unit value for a lavatory?
1.0 WSFU
What is the Water Supply Fixture Unit value for a bar sink?
1.0 private, 2.0 public
What is the Water Supply Fixture Unit value for a kitchen sink, with or without dishwasher?
1.5 WSFU
What is the Water Supply Fixture Unit value for a laundry sink?
1.5 WSFU
What is the Water Supply Fixture Unit value for a shower, per head?
2.0 WSFU
What is the Water Supply Fixture Unit value for a flush tank urinal?
2.0 WSFU
What is the Water Supply Fixture Unit value for a 1.6. GPF tank water closet?
2.5 WSFU
What is the WSFU value for 1 water closet flushometer valve?
40 WSFU
When there are 2 water closet flushometer valves, what is the WSFU value of the second valve?
30 WSFU
When there are 3 water closet flushometer valves, what is the WSFU value of the third valve?
20 WSFU
When there are 4 water closet flushometer valves, what is the WSFU value of the fourth valve?
15 WSFU
When there are 5 or more water closet flushometer valves, what is the WSFU value of the fifth, and each additional valve?
10 WSFU each
What is the WSFU value for 1 urinal with a flushometer valve?
20 WSFU (which is half the value of a WC Flushometer valve)
When there are 2 urinal flushometer valves, what is the WSFU value of the second valve?
15 WSFU
When there are 3 urinal flushometer valves, what is the WSFU value of the third valve?
10 WSFU
When there are 4 urinal flushometer valves, what is the WSFU value of the fourth valve?
8 WSFU
When there are 5 or more urinal flushometer valves, what is the WSFU value for the fifth, and each additional valve?
5 WSFU each
What is the approximate BTU/H input for a single-family warm air furnace, according to table 1208.4.1?
100,000 btu/h
What is the approximate BTU/H input for a multi-family warm air furnace, per unit, according to table 1208.4.1?
60,000 btu/h
What is the approximate BTU/H input for a single-family hydronic boiler, according to table 1208.4.1?
100,000 btu/h
What is the approximate BTU/H input for a 30 to 40 gallon tank water heater, according to table 1208.4.1?
35,000 Btu/h
What is the approximate BTU/H input for a 50 gallon tank water heater, according to table 1208.4.1?
50,000 Btu/h
What is the approximate BTU/H input for a domestic range, according to table 1208.4.1?
65,000 Btu/h
What is the approximate BTU/H input for a gas refrigerator , according to table 1208.4.1?
3000 Btu/h
What is the approximate BTU/H input for a clothes dryer, according to table 1208.4.1?
35,000 Btu/h
What is the approximate BTU/H input for a gas fireplace, direct vent, according to table 1208.4.1?
40,000 Btu/h
What is the approximate BTU/H input for a gas log, according to table 1208.4.1?
80,000 Btu/h
What is the approximate BTU/H input for a barbecue, according to table 1208.4.1?
40,000 Btu
