INSTRUCTIONS
FAN SELECTION DIAGNOSTIC AID KIT
INTRODUCTION
This diagnostic procedure is intended to assist in system design and fan selection for subslab
depressurization (suction) radon mitigation systems. It provides a simple method by which
one may derive information about the natureof the material below a concrete slab oor. It
requires only one slab penetration and can be easily performed unassisted by one person in a
few minutes. For maximum information it should be used in conjunction with communications
testing; however, where this is not feasible or desired it may be used as a stand-alone test.
KIT CONTENTS
• One (1) Dwyer 0-100” magnehelic gauge (magnehelic) with accessories
One (1) Dwyer magnehelic carrying case with accessories
One (1) set of instructions
OTHER REQUIRED EQUIPMENT & MATERIALS
Vacuum Cleaner with 1 1/4” hose and suction wand. It is recommended that a canister-type
vacuum cleaner capable of approximately 50” of water column suction be used (Eureka Mity
Mite 3 HP or equivalent). The vacuum cleaner should use standard 1 1/4” vacuum hose.
1.0 ASSEMBLY
Page 1IN099 Rev C 04/21 3 Saber Way, Ward Hill MA 01835 | Radonaway.com
P/N 28003
•
•
See Dwyer instructions accompanying 0-100" magnehelic. Using 1/8" NPT pipe plugs
provided plug both high and low pressure tap holes on back of magnehelic. Attach the
magnehelic to the metal plate provided with the carrying kit using No. 6-32 machine screw
also provided with the carrying kit.
1.1 MAGNEHELIC & CARRYING KIT
2.0 DIAGNOSTIC TESTING
2.1 REFERENCE SUCTION
Connect one end of rubber tubing supplied with carrying kit to the brass nipple on the
low pressure side of the magnehelic. Connect the other end·of rubber tubing to the brass
nipple on the vacuum line of the vacuum cleaner. Turn on the vacuum cleaner. To determine
accomplished by placing one’s hand over the opening). Note the suction indicated on the
Note: This reference suction should be determined each time a diagnosis is performed since
the maximum suction of any given vacuum cleaner will vary with many factors. To maintain
consistency it is recommended that a new clean vacuum cleaner bag be used.
2.2 TESTING THE SUBSLAB MATERIAL
Connect the vacuum line of the vacuum cleaner to a penetration in the concrete slab as shown
Turn on the vacuum cleaner. Make sure there is no leakage of outside air into the vacuum line
and that all the air is coming from the subslab. Record the suction indicated on the magnehelic
Page 2
3 Saber Way, Ward Hill MA 01835 | Radonaway.comIN099 Rev C 04/21
INSTRUCTIONS FAN SELECTION
DIAGNOSTIC AID KIT
P/N 28003
1.2 PRESSURE CONNECTIONS
There are two 1/8" NPT brass pipe adaptor plugs to rubber tubing (small brass nipples)
provided with the magnehelic. Insert one into low pressure tap hole on side of magnehelic.
High pressure tap hole should be left open.
1.3 VACUUM CLEANER CONNECTION
The second 1/8" NPT brass pipe adaptor plug to rubber tubing (small brass nipple) is to be
inserted in the vacuum line of the vacuum cleaner that is to be used. This is most easily
accomplished by drilling a 3/8" hole in one of the vacuum cleaner "wands". The brass nipple
may then be screwed tightly into the hole (do not overtighten). To an airtight seal silicone
caulk may be used.
in the gure below. It is important to ensure a good seal between the vacuum line and the slab.
VACUUM CLEANER SUCTION TEST
Page 3
3.0 ANALYSIS
Calculate the percentage of maximum vacuum cleaner suction that is encountered at the slab
equation is:
Having obtained this percentage the chart on the next page may be used to provide guidance
on likely subslab material, communication and reasonable fan choices.
Note:
restrictions, etc.
3 Saber Way, Ward Hill MA 01835 | Radonaway.comIN099 Rev C 04/21
INSTRUCTIONS FAN SELECTION
DIAGNOSTIC AID KIT
P/N 28003
4.0 POTENTIAL PITFALLS
One must be somewhat careful in drawing conclusions and designing the mitigation system
based on this diagnostic procedure. Other factors may cause the results to be misleading. These
include:
(1) Slab condition
(2) Foundation structure such as subslab strip footers
(3) Variations in subslab permeability across the slab
(4)
(5) Ground water
Communications testing can often detect the presence of some of these conditions. Good system
design should deal with all factors and allow the mitigator to price the system appropriately.
WARRANTIES AND REPRESENTATIONS
Subject to applicable consumer protection legislation, RadonAway, Inc. warrants that this test
kit will be free from defective materials and workmanship for a period of (1) year from the
date of purchase. Warranty is contingent on use in accordance with the instructions provided.
This warranty does not apply where repairs or alterations have been made or attempted by
others; or the equipment has been abused or misused. Warranty does not include damage
in shipment unless the damage is due to the negligence of RadonAway, Inc. To make a claim
under these limited warranties, you must return the defective item to RadonAway, Inc. with a
copy of the purchase receipt. All other warranties, expressed or written, are not valid.
This diagnostic aid kit is intended for use by trained Radon professionals. These instruction
are the sole responsibility of the user. RadonAway makes no representations or guarantees as
to the accuracy of such interpretation.
Page 43 Saber Way, Ward Hill MA 01835 | Radonaway.comIN099 Rev C 04/21
INSTRUCTIONS FAN SELECTION
DIAGNOSTIC AID KIT
P/N 28003
FAN SELECTION CHART
PERCENTAGE OF MAXIMUM SUCTION OF VACUUM
INSTRUCTIONS
FAN SELECTION DIAGNOSTIC AID KIT
P/N 28003
Page 53 Saber Way, Ward Hill MA 01835 | Radonaway.comIN099 Rev C 04/21
INSTRUCTIONS FAN SELECTION
DIAGNOSTIC AID KIT
P/N 28003
/
