Installation Guide

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2. The FILTERSCAN WiFi Home Air Filter Monitor should be attached to the external wall
of the return air duct or plenum, either upstream or downstream from the air filter, and at least
six inches from the filter or any other obstructions within the duct or plenum.
3. Locate an area on the return, preferably downstream from the air filter (that is, between the air
filter and the HVAC system blower), large enough to place the Monitor template on a flat
surface and where there are NO obstacles inside the duct or plenum. There should be
sufficient clearance (6” minimum) from the surrounding walls and from any components within
the HVAC system. If there is an obstruction such that the Monitor cannot be installed as
described above, you may need to complete the installation using the optional CA-4DP
Tubing Kit.
4. Tape the Monitor template at the location found in the previous step, such that "TOP" is facing
upward. The FILTERSCAN WiFi Home Air Filter Monitor front panel must be clearly
visible when installed.
5. Using the template, Drill one 3/8” hole for the sensor.
6. For sheet metal plenum installation, drill four small holes (7/64") for the mounting screws
provided.
a. Remove the Drill Template
b. Attach the FILTERSCAN WiFi Home Air Filter Monitor by aligning its sensor tube
with the larger hole and secure the Housing using the mounting screws supplied. The
sensor tube does not extend into the duct.
7. For Duct Board plenum installation, follow the directions below. Otherwise go to Step 8.
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 Home Air Filter Monitor mounting hole
locations (see Drill Template) as well as the Sensor Tube location.
d. Remove the Drill Template
e. 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.
f. 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
g. Insert each toggle through the duct board holes, insuring the Sensor Tube aligns with the
Sensor Tube hole.
h. 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.