Instructions / Assembly

IN020 Rev K 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 system design must provide a means for water to drain back to a slab hole
to remove the condensation. The RP 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 RP Series Fans are NOT suitable for
underground burial.
For RP Series Fan piping, the following table provides the minimum recommended pipe diameter and
pitch under several system conditions.
Pipe
Dia.
Minimum Rise per Ft of Run*
@25 CFM @50 CFM @100 CFM @200 CFM @300 CFM
6" - 3/16 1/4 3/8 3/4
4" 1/8 1/4 3/8 2 3/8 -
3" 1/4 3/8 1 1/2 - -
*Typical RP1xx/2xx Series Fan operational flow rate is 25 - 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.)
Under some circumstances in an outdoor installation
a condensate bypass should be installed in the outlet
ducting as shown. This may be particularly true 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.
The bypass is constructed with a 45 degree Wye
fitting at the bottom of the outlet stack. The bottom of
the Wye is capped and fitted with a tube that connects
to the inlet piping or other drain. The condensation
produced in the outlet stack is collected in the Wye
fitting and drained through the bypass tube. The
bypass tubing may be insulated to prevent freezing.
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.
RUN
RISE