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Option 2 - vent area requires additional mounting braces to support the fan
Step 1.
Measure the distance between
the 2 framing members that the
braces will attach to. (fig. 7)
Step 3.
Locate the two braces between 14.25" and 15" apart
and centered over the vent opening then fasten to the
framing members with 3" screws (not supplied). (fig. 9)
Static or Turbine Vent Installation
The All Purpose Ventilator can be used to push hot air out of your attic through existing roof vent.
Step 1.
Determine the location of the vent to
be used and measure the distance
between the two rafters. (fig. 13)
Step 2.
Cut two 2x4 braces to the required length.
Step 3.
Locate the two braces between14.25"
and 15" apart and centered over the
vent opening then fasten to the rafters
with 3" galvanized deck screws (not
supplied). (fig. 14)
Keeping air moving in your crawl space can help to remove moisture and inhibit mold and mildew growth. The All Purpose
Ventilator can be mounted as described above, or a box frame can be built to hold the fan in position. It is recommended that
To build the box frame
Step 1.
Depending on the distance your
floor joist are seperated, you
will need to cut 4 braces: two at
14.5" for the side braces, one at
17.5" for the bottom brace and
one between 17.5" and 25.5"
for the top brace (fig. 17). Most floor joists are either 16" on
center or 24" on center. Measure the distance before cut-
ting the top brace to be sure of the distance required.
Step 2.
Fasten the 4 boards together with 3" screws to make a
square box with inner dimensions 14.5" x 14.5". (fig. 18 & 19)
fig. 18
between
14.25" and 15"
Important Tip:
into intake vents once the powered fan is installed and running.
Vent Opening
fig. 13
between
14.25" and 15"
fig. 14
Crawl Space Vent Installation
you evaluate your crawlspace to determine the best method.
fig. 17
top brace should be 17.5" to 25.5"
depending how wide the floor
joist span is.
14.5"
inner dimension
should be 14.5"
fig. 19
Step 2.
Cut two 2x4 braces to the
required length. (fig. 8)
fig. 7
Step 4.
Then mount the fan as
described in option 1.
(fig. 10)
fig. 9
Seal off other static vents to avoid turning them
Step 4.
Position the fan assembly between the
two braces and slide the fan assembly
towards the vent opening. (fig. 15)
Step 5.
Fasten the brackets to the two braces
with included screws "G" (fig. 15) and
tighten the 8 nuts. (fig. 16)
Note: When the rafter is greater than
5" wide locate the braces between
the rafters to insure fan can be posi-
tioned against the vent.
To mount in crawlspace
Step 3.
Mount the frame in front of the vent opening by attaching it to the floor joists with 3" gal-
vanized screws. If the frame assembly and fan mount lower than the bottom of the vent
opening, (fig. 20) mount the frame about 8" to 10" away from the vent to prevent direct
contact with the foundation when the fan is mounted. (fig. 21a) Secure the frame to the
bottom of the floor joists with at least 2 screws on each side making sure it is centered
evenly on both. (fig. 21b)
Vent
Opening
crawlspace
fig. 20
Step 4.
Mount the fan inside the frame by attaching the brackets
with included screws "G". Center the fan in the frame
making sure that there is at least 4" of clearance
between the fan housing and the crawlspace vent
opening. (fig. 22)
outer wall
interior oor
interior oor
oor joist
oor joist
span is larger than 16"
vent opening
8" - 10"
ground
box frame
box frame
fig. 21a
AIRFLOW
crawlspace
fig. 8
fig. 10
fig. 15
fig. 16
oor joist
adjust the top
brace accordingly
vent opening
crawlspace
ground
fig. 21b
outer wall
vent opening
4"
ground
box frame
fig. 22
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