IN020 Rev F 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
Summary of Contents for RP SERIES
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