IN065 Rev C Page 4 of 8
1.6 CONDENSATION & DRAINAGE
Condensation is formed in the piping of a mitigation system when the air in the piping is chilled below
its dew point. This can occur at points where the system piping goes through unheated space such as an
attic, garage or outside. The SF Fan has an integral means for water to drain back to the slab hole to
remove the condensation. The SF Series Fan
MUST
be mounted vertically plumb and level, with the
outlet pointing up for proper drainage through the fan. Avoid mounting the fan in any orientation that
will allow water to accumulate inside the fan housing. The SF Series Fans are
NOT
suitable for
underground burial.
For SF Series Fan piping, the following table provides the minimum recommended pipe diameter and
inlet pitch under several system conditions.
Pipe
Dia.
Minimum Rise per Ft of Run*
@25 CFM
@50 CFM
@100 CFM
4"
1/8
1/4
3/8
3"
1/4
3/8
1 1/2
*
Typical SF160 Series Fan operational flow rate is 30 - 90 CFM 0n 3” and 4” pipe.
(For more precision, determine flow rate by measuring Static Pressure, in WC, and
correlate pressure to flow in the performance chart in the addendum.)
On an outdoor installation a condensate bypass is not required. The SF Fan contains an
integral internal bypass suitable for use in cold climate installations which require long lengths
of outlet ducting or where the outlet ducting is likely to produce large amounts of
condensation because of high soil moisture or outlet duct material. Schedule 20 piping and
other thin-walled plastic ducting and Aluminum downspout will normally produce much
more condensation than Schedule 40 piping which is prefered.
1.7 "SYSTEM ON" INDICATOR
A properly designed system should incorporate a "System On" Indicator for affirmation of
system operation. A manometer, such as a U-Tube, or a vacuum alarm is recommended for
this purpose.
1
.
8 ELECTRICAL WIRING
The SF Series Fans operate on standard 120V 60 Hz. AC. All wiring must be performed in
accordance with the National Fire Protection Association’s (NFPA)”National Electrical Code,
Standard #70”-current edition for all commercial and industrial work, and state and local
building codes. All wiring must be performed by a qualified and licensed electrician. Ensure that
all exterior electrical boxes and other components are outdoor rated and properly sealed to
prevent water penetration into the box. A means, such as a weep hole, is recommended to drain
the box. Note that the exterior electrical box may be mounted under the removeable bottom right
corner cover. If located under the corner cover the electrical box should be positioned relative to
the inlet pipe using the template provided.
1.9 SPEED CONTROLS
The SF Series Fans are rated for use with electronic speed controls. The recommended speed
control if used is Pass & Seymour Solid State Speed Control Cat. No. 94601-I.
RUN
RISE
