RadonAway RP140 Installation instructions manual - page 4

IN020 Rev T 0217

4

3 Saber Way, Ward Hill, MA 01835   |   radonaway.com

1.7  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 / 

RPc 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 

/ RPc Series Fans are NOT suitable for underground burial.

For RP / RPc Series Fan piping, the following table provides the minimum recommended pipe diameter and pitch 

under several system conditions.

Pipe

Diameter

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

-

-

1.8 SYSTEM MONITOR & LABEL

A System Monitor, such as a manometer (P/N 50017) or audible alarm (P/N 28001-2, 28001-4 or 28421), 

should be provided and is required to notify the occupants of a fan system malfunction. A System Label (provided 

with Manometer P/N 50017) with instructions for contacting the installing contractor for service and identifying 

the necessity for regular radon tests to be conducted by the building occupants must be conspicuously placed in a 

location where the occupants frequent and can see the label.

1.9  VENTILATION 

prevent the warm bathroom air, for example, from forming condensation in the ducting where it is exposed to colder 

attic air. The outlet of the fan should always be ducted to the outside. Avoid venting the outlet of the fan directly into 

an attic area. The excess moisture from the bathroom can cause damage to building structure and any items stored 

in the attic. Multiple venting points may be connected together using a “

each grille should be equal in order to minimize noise and resistance. Straight smooth runs of rigid metal ducting 

will present the least resistance and maximize system performance. The Equivalent Length of Rigid Metal Ducting 

Flexible ducting, if used, must always be as close to being fully extended as possible. Formed rigid metal duct elbows 

will present the least resistance and maximize system performance; recommended bend radius of elbow is at least 

1.5 x duct diameter. 

RP / RPc Series fans are not suitable for kitchen range hood remote ventilation applications. For quietest performance, 

the fan should be mounted farther away from the inlet duct, near the outside vent. A minimum distance of 8 feet is 

recommended between the fan or T/Y of a multi-intake system and intake grille(s).

and minimizing possible condensation and icing within the system while the fan is not operating. Backdraft dampers 

are highly recommended at each intake grille for bathroom ventilation in all cold climate installations. Installation 

instructions are included with Spruce backdraft dampers.