Fantech DBF4XL User Manual
DBF4XL
FC Mounting
Clamps (optional)
Alternate Location
Secondary Lint Trap
Installation Instructions for
Model DBF4XL Dryer Exhaust Booster
READ & SAVE THESE INSTRUCTIONS!
Installation Guidelines
Please note: DBF4XL fans are not
potentially explosive situation may exist. DO NOT USE with heated air in
excess 140˚F (60˚C).
Do not install in an exhaust ductwork wher
25 feet (7.62 meters). The DBF4XL is suitable to overcome an equivalent
duct length of 130 feet (40 meters) of 4 inch diameter galvanized steel duct,
and to maintain a air velocity of 1200fpm (6.10 m/s).
Calculating Duct Run
To calculate the length of your planned duct run, measure from the dryer
to external venting point in roof or wall. For each bend or elbow add 5-7
feet to your total duct run calculations. The DBF4XL can be used on runs
up to 130 feet.
explosion proof.
e the equivalent duct length is <
Do not use the fans if a
Fan and Switch Mounting
The DBF4XL is to be mounted a minimum of 5 linear (not equivalent) feet
from the dryer outlet.
where excessive dryer lint generation is likely or to increase the time interval between routine maintenance of the Dryer Booster Fan. (See illustration
on right). A mounting bracket (included) attached to a rafter or joist should
be used to stabilize the fan. Although not recommended, a vertical rigid
duct may support the fan if the duct is securely stabilized. (Consult local
codes prior to supporting the fan in the duct alone.) It is recommended that
duct work be attached to the inlet and outlet of the fan by means of
tion isolation clamps (optional) to permit periodic inspection of the blower.
Refer to maintenance instructions for inspection recommendations. All
duct connections should be properly sealed to prevent leakage and loss of
formance. Flex duct connections between the dryer duct connection
fan per
and exhaust duct should be stretched as smooth as possible.
A secondary lint trap can be used in applications
FC vibra-
Includes:
1 DBF4XL Dryer Exhaust Booster
1 Fan Mounting Bracket and Hardware
1 Wall Label (Mount on wall near dryer.)
1 Tubing & Grommet
Pressure Sensor Switch Operation
The DBF4XL contains a positive pr
dryer operation and activates the booster fan from an independent electrical
circuit. This eliminates connections through the dryer circuit which may void
the manufacturers’ warranty as well as manual systems which require the
attention of the operator or costly cur
Power to the booster fan is connected in series through a normally open terminal on the switch. A pressure tap is connected to a nipple on the side of the
switch. When the dryer begins operation, positive pressure in the duct causes the switch diaphragm to expand closing the circuit to the booster fan. An
integral delay-on-br
10 minutes. Cycle will reinitiate after a few seconds as long as the dryer is
operating. This will continue until the dr
period has lapsed. Dr
sure switch are not adversely affected by the starting/stopping intervals.
eak timer in the switch will cycle the fan on for intervals of
ying cycles, the booster fan, the delay timer and the pr
essure sensing switch which r
ent/temperatur
r
yer has stopped and the timer delay
e sensing systems.
ecognizes
es
-
DBF4XL FAN/SWITCH INSTALLATION INSTRUCTIONS
93/4"33/4"
37/8"
6
1
5
/
1
6
"
1"
1"
2"
2"
3"
2"
37/8"
93/4"
3
3
/4"
37/8"
615/16"
1"
1"
2"
37/8"
Fan Installation
Step 1. Selecting Fan Location
Fan must be mounted a minimum of 5 linear feet from the dryer outlet. In order to perform recommended maintenance, fan location should allow sufficient access for service. Refer to dimensional drawings shown below.
Step 2. Mount Bracket
Using the wood screws provided, attach the mounting bracket to a support beam at the selected location. Fan mounting can be in any angle, however, vertical mounting is recommended to reduce condensation buildup in the fan. If a horizontal installation is necessary and condensation buildup may pose a
problem, a 1/4" hole drilled in the bottom of the housing (along with an NPT insert and drain tubing) may
be installed to allow condensation to drain.
Step 3. Mount Fan
For proper operation, the switch diaphragm should be positioned vertically.
diaphragm position for horizontal, vertical and ducts installed at an angle.) Wiring box should be positioned for easy access. Attach fan to the mounting bracket with the self tapping screws provided. Care
should be taken not to strip the housing. Although screw pilot holes are not required, 3/32" (or smaller)
pilot holes are recommended.
NOTE: Steps 2 & 3 may be reversed.
(Illustrations below show
Mount Bracket
Dimensional Data
Pr
essure Switch Positioning
Horizontal Duct
Dimensions in inches.
Correct Switch
Positioning
- Diaphragm Positioned Vertically
Angled Duct
Mount Fan
Mounting Bracket &
Screw Locations
Vertical Duct
Correct Diaphragm Positioning
Incorrect Diaphragm Positioning
Correct Diaphragm
Positioning
Incorrect
Diaphragm
Positioning
Diaphragm Correct
in all Positions
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