Installation guide

10
a. Obtain Toggle Bolts (available at Home Depot)
(1) #1/8" x 2" SKU 261181 Package of 25 or
(2) #1/8" x 3" SKU 261203 Package of 25
b. Use toggle bolts that are one inch longer than the thickness of the duct board to allow the
toggle to expand after inserting through mounting hole.
c. Drill 3/8" holes at the four FILTERSCAN WiFi Air Filter Monitor mounting hole
locations (see Drill Template) as well as the Sensor Tube location.
d. Insert the bolt alone through the FILTERSCAN housing from the inside. Once through
the housing, screw on the toggle a few threads such that the fins fold toward the housing.
Do this for all four mounting holes.
e. Apply silicone sealant or air duct sealer to the inner sides of the toggle (see below) such
that when the toggle expands inside the duct, the silicone will seal the hole and secure the
toggle to the inside of the duct to help prevent the toggle from dropping into the duct if the
screw is removed at a later date after the sealant has cured.
Figure 8: Toggle bolt for duct board installation
f. Insert each toggle through the duct board holes, insuring the Sensor Tube aligns with the
Sensor Tube hole.
g. Once all four toggles are fully inserted through the duct board, lightly pull the housing away
from the duct board while tightening each bolt, until all four are securely fastened, without
crushing the duct board. Make sure the Sensor Tube seal has been squeezed between
the housing and duct board to insure no air leakage.
Figure 9: Side view of FILTERSCAN WiFi monitor
8. IMPORTANT! Set the Upstream/Downstream switch shown in Figure 10 so that it matches
the FILTERSCAN WiFi Air Filter Monitor’s position with respect to the air filter (that is, OFF
for upstream mounting or ON for downstream or differential mounting). Please see the
APPENDIX for 'Various HVAC Configurations for Monitor Installation' configurations.