Instructions / Assembly
IN018 RevA A 0 923
43 Saber Way, Ward Hill, MA 01835 | radonaway.com
4.0 BACKDRAFT DAMPERS
Backdraft dampers allow airow in only one direction preventing cold/hot drafts from entering the vented area
and minimize 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.
5.0 ELECTRICAL WIRING
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 qualied and licensed electrician. A Ground Fault Interrupter
(GFI) circuit is not required in most installations; check your local codes. Ensure that all exterior electrical boxes
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 fan is not intended for connection to rigid metal conduit.
6.0 APPLICATIONS
Suitable for general ventilation, bathroom venting, fresh air supply, duct boosting, building pressurization, etc.
RB Series Fans not suitable for kitchen range hood venting.
7.0 INSTALLATION
Step 1: Install Mounting Bracket as shown (Fig. 4) (RB110, RB190 & RB275 only; separate instructions
for RB400 & RB500 are included with Mounting Bracket Kit). Insert Grommets into slots in Mounting Bracket.
Orient the Electrical Box relative to Mounting Bracket as required. Attach the fan to the Mounting Bracket
with 3 #10 self-tapping screws, provided. Avoid over tightening screws.
Step 2: Select location for fan mounting. A location 2/3 along the ducting, a minimum of 10 feet away from
the inlet vent to the fan or the T/Y of a multi-intake system—will provide the quietest operation. Fan should
be mounted vertically to prevent moisture from accumulating in the fan housing. Attach bracket to mounting
structure with the 1 1/4” screws provided (Fig. 5).
Step 3: Connect ductwork between fan inlet and area to be vented through inlet grille (Fig. 6). Flexible,
non-metallic ducting is recommended for quietest operation and easiest installation. Insulated exible ducting
is highly recommended for bathroom ventilation in all cold climate installations. Metal worm drive clamps,
spring clamps, and adjustable plastic ratchets are recommended for connection of ducting. Silicon caulk
or duct tape may be used for additional sealing. Duct tape should be used to retain insulation.
Step 4: Connect inlet grille(s) (Fig. 7). An optional backdraft damper may be installed in the inlet grille to
prevent cold air from backing into the inlet, prevent conditioned air from escaping and also prevent condensation
from forming inside the ductwork. Backdraft dampers are highly recommended at each intake grille for bathroom
ventilation in all cold climate installations.
Step 5: Connect outlet of fan to outside vent (Fig. 8). The outside vent may go through the roof, sidewall
or soft as desired. Flexible, nonmetallic ducting is recommended for quietest operation and easiest installation.
Insulated exible ducting is highly recommended for bathroom ventilation in all cold climate installations.