Specification Sheet

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OPTIONS/ACCESSORIES
Solid State Speed Control (SDBD): S&P’s solid state control is matched to the motor and blower wheel
to allow continuous reduction in performance allowing adjustments of airow for system balancing. CFM is
reduced in direct proportion to motor speed reduction. Speed control is available for 115 or 230 volt single
phase. Exhauster performance can be controlled from the ventilated area.
Constant Pressure Controls (SDBDe): For constant pressure control applications, the S&P constant pressure control
package is available. This package includes the components that are needed to complete a demand-based exhaust
ventilation system for kitchens, bathrooms, and/or clothes dryer exhaust in multi-story buildings. S&P recognized that
the programming procedure for many constant pressure controls can be challenging, so this package is the simplest
system available. The control box can be easily installed in the eld, either mounted on a curb or inside the building.
The backlit LCD display and pressure transducer are pre-programmed to work together to increase or reduce the
speed of the fan to accommodate for the actual demand.
Potentiometer Shipped Loose (SDBDe): If a variable rate that is manually changed by the operator from the occupied
space is desired, the potentiometer is shipped loose and eld installed in the appropriate accessible location. Simply
rotating the dial will vary the speed of the fan from 20% to 100% full speed.
Automatic Belt Tensioner (SDB): Available on sizes
6-16, The Automatic Belt Tensioners eliminate the need
for regular manual retensioning of drives, and the risk
of inadvertently over-tensioning drive components
is avoided and overall drive operating e󰀩ciency is
enhanced. Benets include reduction in startup and
maintenance costs, increased belt life, increased drive
e󰀩ciency, and ensure drive components do not snag
obstructions.
Roof Curb: Prefabricated heavy-gauge galvanized steel, welded construction, 12” high (other
heights are also available) with 1-1/2” wood nailer. Assures perfect t of exhauster to roof opening.
Options include burglar bars, single or double pitch construction and hinged curbs for easy duct
access.
Sound Curb: Option of thermal acoustical lining or a complete maximum sound attenuating ba󰀪e system. Provision
for mounting damper is available. Contact factory for information regarding e󰀨ect on exhauster air performance and
sound level.
Motor Operated Damper: Motor operated aluminum damper for positive closure against backdraft.
Automatic Damper: Automatic aluminum damper for ease in installation and e󰀨ective backdraft
protection.
Companion Gravity Units: Model RCX-II comes in a wide range of sizes and air capacities to provide
relief or intake air to the system. Curbs and dampers are available to t all sizes. Spun aluminum
hoods provide a pleasing appearance, complementing the Model SDBD & SDB exhausters.
Special Coatings: Powered roof exhausters often require special coatings for protective and
decorative purposes. Available coatings include: Synthetic Resin, Epoxy, and Heresite (air-dried phenolic). Contact
your representative or the factory for more information on available coatings and colors.
Curb Hinge Arrangement: The curb hinge arrangement provides easy access to the exhaust fan, backdraft damper,
and duct for servicing and cleaning.
Motor Pulley
Fan Pulley
Belt Tensioner Arm
Belt Tensioner Pulley
Belt Tensioner Bracket
Motor Bracket
MODELS SDBD, SDBDe & SDB
DIRECT DRIVE & BELT DRIVE CENTRIFUGAL DOWNBLAST ROOF EXHAUSTERS