Instructions / Assembly

IN018 RevAA 0923
33 Saber Way, Ward Hill, MA 01835 | radonaway.com
1.0 MOUNTING
The Spruce RB Series Fans may be mounted at any angle without affecting performance although the vertical
mounting position shown in Fig. 1 is highly recommended. If the vertical mounting position is not possible,
care should be taken to avoid creating a low spot in the fan/duct system where condensation might accumulate
in the fan housing as shown in Fig. 2. In situations where horizontal mounting is desired and condensation is likely
to occur (bathroom ventilation in cold climates) this problem might be avoided by mounting the fan 30 degrees
beyond horizontal as shown in Fig. 3.
2.0 FAN SEALING
RB Series Fans are factory sealed, no additional caulk or other materials are required to inhibit air leakage.
3.0 DUCTING
Any type of ducting is acceptable, however, exible nonmetallic ducting is recommended for easy installation and
quieter operation. Insulated exible ducting is highly recommended in cold climates to prevent the warm bathroom
air 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 T or Y tting. Ideally duct should be arranged such that equal duct lengths are used
between intake and T or Y tting, this will result in equal ow rates in each intake branch. If adjustable intake
grilles are used on multi-intake systems, then the opening on 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 resulting in .2” WC pressure loss for each fan model
is provided in the specication section of these instructions. 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.
To ensure quiet operation of our inline and remote fans, each fan shall be installed using sound attenuation techniques
appropriate for the installation. For bathroom and general ventilation applications, at least 8 feet of insulated exible
duct shall be installed between the exhaust or supply grille(s) and the fan. RB Series Fans are not suitable for kitchen
range hood remote ventilation applications. The ducting from this fan to the outside of the building has a strong effect
on the airow, noise and energy use of the fan. Use the shortest, straightest duct routing possible for best performance,
and avoid installing the fan with smaller ducts than recommended. Insulation around the ducts can reduce energy loss
and inhibit mold growth. Fans installed with existing ducts may not achieve their rated airow.
Fan Installation & Operating Instructions
Fan Series
RB110 p/n 28128
RB190 p/n 28578
RB275 p/n 28115
RB300 p/n 28088
RB350 p/n 28261
RB400 p/n 28206
RB500 p/n 28207
Fig. 1
Fig. 3Fig. 2