BAG TEST (Determining optimal discharge hood blade settings)
By determining the amount of time the RMS160 radon fan takes to inflate the included 55 gallon garbage bag you can opti-
mize the settings of the internal blades of the exhaust hood to create maximum dilution and discharge velocity. The outer
right and left blades adjust the dilution and the inner right and left blades adjust the velocity of the discharge.
9.
NOTE:
Operate fan for 10 minutes before proceeding to evacuate any built up moisture and soil gases below sub-slab
area. Turn fan off and secure included garbage bag to the end of the PVC exhaust pipe by pulling draw-strings tight and
duct taping to seal off the end of the pipe, (See Diagram J).
10. Squeeze air out of the bag, (See Diagram K).
11. Using an extension cord or working with a partner plug in the radon fan. As soon as power is supplied start to time how
many seconds it takes to fully inflate the 55 gallon bag and record here (Seconds ______). The bag should extend hori-
zontally away from the PVC pipe when fully inflated, (See Diagram L). If you don't get a good time trial, unplug fan,
squeeze air out of bag and repeat time test.
12. After time test, assemble discharge hood by sliding the included PVC Flange onto the studs of the discharge hood and
secure with included nuts. Note that either set of 4 round holes on the flange can be used.
13. Mark the discharge PVC where it meets the lowest outside surface of wall, remove and cut to length, (See Diagram M).
Firmly insert and glue pipe into fan discharge. Insert discharge hood onto PVC pipe to test fit prior to gluing. Next glue the
discharge hood to the PVC stub on the home’s exterior making sure that it is right side up and level. The seams
on the side of the hood should point down. Fasten to exterior through the 4 corner holes using provided hardware.
Caulk around exterior of discharge hood with exterior rated caulk, (See Diagram N).
14. Reference the time recorded in Step 11 on the Radon Vac
TM
Bag Inflation Test chart to determine the suggested blade
settings. Set outer tips of left and right sides of each set of blades to line up with the scale on hood label and tighten
screws on both top and bottom to lock settings in place.
NOTE:
To tighten screws a second screwdriver may be needed
to prevent the opposite screw from rotating as the screw is tightened, (See Diagram O).
6
Diagram J
Diagram K
Diagram L
Diagram M
Diagram N
Diagram O
HOOD SEAM SHOULD POINT DOWN
CAULK
HOOD
SCREWDRIVER
SCREWDRIVER
INNER
BLADES
OUTER
BLADES
