Page 3 of 7 IN018 Rev H
INSTALLATION INSTRUCTIONS IN018 Rev H
RB Series
RB110 P/N 23046-1, 28128
RB275 P/N 23034-1, 28115
RB300 P/N 23022-1, 28088
RB350 P/N 23023-1, 28261
RB400 P/N 23052-1, 28206
RB500 P/N 23053-1, 28207
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 Ducting
Any type of ducting is acceptable, however, flexible nonmetallic ducting is recommended for easy installation and
quieter operation. Insulated flexible 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" fitting. Ideally Duct should be arranged such that
equal duct lengths are used between intake and "T" or "Y" fitting, this will result in equal flow rates in each intake
branch. If adjustable intake grilles are used on multi-intake systems then the opening on each grill should be equal
in order to minimise noise and resistance. Straight smooth runs of ducting will present the least resistance and
maximize system performance. Flexible ducting must always be as close to being fully extended as possible.
For quietest performance, the fan should be mounted further away from the inlet duct, near the outside vent. A
minimum distance of 10 feet is recommended between the fan or T/Y of a multi-intake system and intake grille(s).
3.0 Backdraft Dampers
Backdraft dampers allow airflow 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 back draft dampers.
4.0 Electrical Wiring
Electrical connection to the fan should be performed by a qualified person in accordance with all local, state and
national electrical codes. A Ground Fault Interrupter (GFI) circuit is not required in most installations, check your
local codes.
5.0 Applications
Suitable for general ventilation, bathroom venting, fresh air supply, duct boosting, building pressurization, etc.
The RB110 and RB350 are suitable for dryer boosting.
Not suitable for kitchen range hood venting.
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