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UIC Radon CE Student Agreement:
Introduction to Mitigating Radon in Commercial Buildings
1. I agree to complete all on line assignments.
2. I agree to maintain the integrity of the course, and exam questions and will not
reproduce or otherwise share them with others.
3. I agree to provide feedback to the UIC course coordinator regarding my
experience with the course.
___________________________________
Student’s Name (Please print)
___________________________________________
Student’s Signature
___________________________________________
Student’ E-Mail address
________________
Date
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Introduction to Mitigating Radon in Commercial Buildings
Instructions for In Class Exercise
Figure what size pipe is needed to handle the air flow from each floor penetration to the
fan.
1)
Add the CFM @ each floor penetration
2)
Add the total length of pipe
3)
Add the number and type of elbow(s) (Tees are equal to a 90 elbow)
4)
Indicate what size of pipe is best for air flow and cost.
5)
Indicate where the size of the pipe needs to increase to maintain a low
pressure drop in pipe.
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Send Completed Documents to syn@uic.edu or nsutton2@uic.edu or fax to 312-413-7369.
Pressure drop for 100 feet of pipe in varying pipe sizes and
airflows
Pipe
Size
20
40
60
80
100 125 150 175 200 250 300 400 600
3”
0.14
0.5
1.1
1.8
2.8
4.2
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Approximate pressure drop in inches of w.c. per 100 feet of pipe
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Pressure loss for fittings is given in equivalent feet of pipe
Pipe
Size
Sweep
90°
Sharp
90°
Sweep
45°
Sharp
45°
3”
3’
11’
2’
5’
4”
6’
15’
3’
6’
6”
15’
26’
4’
7’
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Sharp bend elbows have twice the pressure drop of
sweeps.
Long sweeps 90E elbows are better for high air
flows.
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Introduction to Mitigating Radon in Commercial Buildings
Answer the following true/false questions:
1.
Radon systems in commercial buildings are the same
as in large houses.
T / F
T / F
2.
HVAC systems are always working properly.
3.
The EPA recommends that HVAC adjustment be
considered if radon levels are between 4.0 - 10.0
pCi/L.
4.
5.
T / F
T / F
Below grade supply ducts are less of a problem than
below grade return ducts.
T / F
Utility tunnels can increase radon entry and impede
negative pressure extension.
T / F
6.
Commercial sub-slab diagnostics must be more
thorough then residential diagnostics.
7.
Electrical conduit is always far under the concrete
slab.
8.
A pitot tube measures CFM.
9.
The mitigator can take an Asbestos course and
legally drill through asbestos floor tile.
10.
PVC pipe can not be installed above an acoustical
ceiling in a plenum.
T / F
T / F
T / F
T / F
T/F
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Answer the following multiple choice questions:
12. Commercial radon systems are different than residential
systems because:
1. Large HVAC systems play a significant role in the influx
of radon into a structure.
2. May have addition added at a later date.
3. May require more than one penetration.
4. Commercial buildings never have crawlspaces.
13.
What should the mitigator do if the building was not
properly tested?
1.
Run for the hills.
2.
Discuss testing options with the owner.
3.
Retest regardless of owner opinion.
4.
all of the above.
14.
If the HVAC system has substantially changed from the
original specifications:
1.
This is always the case and do not worry about it.
2.
Have the HVAC system inspected by an HVAC expert.
3.
Try to make adjustments yourself.
4.
Install active soil depressurization radon system and
retest.
15.
What
1.
2.
3.
4.
5.
16.
What type of HVAC system will have the greatest effect on
radon levels?
1.
Exhaust fans
2.
Rooftop passive dampers
3.
Below grade return ducts
4.
Plugged fresh air grills
5.
Utility or steam tunnels
17.
Large exhaust fans can exhaust how much air?
1.
250 CFM
2.
500 CFM
3.
5,000 CFM
4.
30,000 CFM
do HVAC systems do?
Supply outside air for ventilation.
Condition the air.
Exhaust contaminated air to the outside.
None of the above.
All of the above.
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18.
Factors that influence air movement under the slab can be:
1.
Compacted fill
2.
Footings
3.
Utility lines
4.
All of the above
19.
Why is a communication test different from an air
flow/pressure test?
1.
Communication test is to simulate a final radon system
floor penetration.
2.
Air flow/Pressure test is to measure just negative
pressure extension.
3.
Communication test is to measure exact air flow and
negative pressure extension.
4.
Air flow/pressure test is to measure exact air flow
and negative pressure extension.
5.
None of the above.
20.
While conducting a sub-slab communication test the suction
hole should be:
1.
Away from slab leakage.
2.
In a location with a large number of below grade
electrical conduit.
3.
Near a load bearing footing.
4.
All of the above.
5.
Both 1 & 3.
21.
What is the CFM if the pitot tube measures a velocity
pressure of .111"?
1.
25 CFM
2.
26 CFM
3.
29 CFM
4.
32 CFM
22.
Why would you spec a large commercial fan as opposed to
many residential fans?
1.
Less expensive
2.
Higher air flow and higher static pressure
3.
Fewer roof penetrations
4.
Fewer floor penetrations
5.
None of the above
6.
All of the above
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23.
ASD may be a better choice then changes to the HVAC system
because:
1.
Less expensive to install and operate
2.
Less likely to be manipulated later
3.
HVAC systems are always properly maintained
4.
All of the above
5.
Both 1 & 2
6.
Both 2 & 3
24.
Asbestos can be found in:
1.
Floor tile and mastic
2.
Steam pipe insulation
3.
Acoustical ceiling tile
4.
Roofing material
5.
All of the above
25.
Fire
than
1.
2.
3.
4.
5.
6.
7.
26.
The best way to mitigate a large commercial building is:
1.
By yourself
2.
Team approach
3.
Hire Uncle Bob to help
4.
Hire your instructor (Dave Gerard)
5.
Either 2 or 4
codes in commercial applications are more stringent
in residential. You should check with:
Fire fighter
Fire marshal
Fire protection engineer
Uncle Bob
All of the above
Both 1 & 2
Both 2 & 3
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Introduction to Mitigating Radon in Commercial Buildings
The presentations below were effective and informative:
(Please comment on the presenters in the space next to their names.)
David Gerard
1
2
3
4
5
Teaching methods were effective.
1
2
3
4
5
Resources were useful.
1
2
3
4
5
Please respond to the following statements:
What is the most important or valuable concept you learned in the course?
How will you change your work as a result of this presentation?
How may we improve the agenda and presentation?
What other topics would you like to learn?
Is there anything else you would like to share?
Thank You!