Radon Mitigation System Design and Installation
1.
Which is most critical in achieving good suction?
Sealing small openings in floor near suction point(s).
Installing fan capable of larger air volume.
Creating large suction pits in tight soil.
Both A. and C.
2.
Which sub-slab material would offer the largest restriction to air flow?
Sand.
Pea-Gravel.
Loose dirt with stone.
Large rock.
3.
A homeowner just finished remodeling his basement using 2"x4" studding and paneling around the perimeter of the basement. You found a finished closet on an exterior wall to run your pipe. What is the closest to the finished basement wall that the edge of a suction point can be placed?
Along side wall.
2 inches away.
6 inches away.
12 inches away.
4.
Which of the following tools is the most cost effective and widely used in determining sub-slab communication?
Grab sampling device.
Micromanometer.
Water gun.
Non-Thermal Smoke.
5.
SSD systems are designed to ?
Create a positive pressure in the living space of the home.
Create a negative pressure in the living space of the home.
Create a positive pressure field under the home.
Create a negative pressure field under the home.
6.
You installed a suction system into the basement floor. You found a clean 4 inch base of pea-gravel, post installation smoke tests indicate you only have suction on 1/2 of the basement floor. What is the most likely problem?
Fan is not strong enough.
There is a footing under the basement floor.
A large gap around the sewer entry in the wall is shorting out the system.
This sometimes happens and you shouldn’t worry.
7.
Pressure field extension is which of the following?
Extending the run on your suction pipe.
Adding additional suction points.
The amount of air being moved through the system.
The distance the suction point can draw air from under the floor.
8.
Suction points near shallow footings can cause what to happen?
Decrease in pressure field extension.
Large air flows in the suction system.
A short to outside air, decreasing system effectiveness.
All the above.
9.
The post mitigation test on a suction system you installed failed. The home had a basement and concrete covered crawl space, with a suction point in both. The basement was unfinished and all cracks and openings were sealed. The system has low air flow and the sub-slab material was a stone sand mix. You believe the problem is poor sub-slab communication. Below are four answers with four different sequences of steps that can be taken. Choose the answer that you believe represents the best sequence of steps to achieve your goal of a radon level below 4 pCi/l.
Enlarge suction point pits, increase fan size.
Add additional suction points, increase fan size.
Add additional suction points, enlarge suction pit.
Increase fan size, increase pipe diameter.