Bosch DHD Serie Manuel D'installation page 4

Downdraft - Unit
Blower /
Duct Transition Box
(Not Included)
Fig. 1
INTRODUCTION
GENERAL DESCRIPTION
The complete downdraft system consists of
the downdraft, a blower and a transition
box if using an Inline or Remote Blower. A
recirculation module is also available when
ducting to the outside is not preferred or
not possible. (See Fig. 1).
The blower can be either integral (mounted
on the vent intake in the cabinet under the
cooktop), an inline (mounted between the
kitchen and exterior wall anywhere within
the duct line), or a remote (mounted on the
roof or outside wall). When a remote or inli-
ne blower is used, a duct transition is
mounted on the ventilator intake in place of
the integral blower to connect the intake to
the duct work. The duct transition must be
purchased separately.
The integral blower or duct transition can
be mounted in different positions on the
intake to route ductwork to avoid cabinet,
building framing, utilities, etc.
The downdraft system is available in 30-
inch or 36- inch. Intended for non-profes-
sional style cooktops only.
A Recirculation Kit can be purchased sepa-
rately and used in conjunction with the Inte-
gral Blower if ducting to the outside is not a
viable option.
4
Strain Relief
Step 1: Plan the installation
Carefully follow the planning procedures
listed below (See Figure 2). Sketches are
NOT intended to be a replacement for care-
ful planning.
A. Determine whether a remote, inline, or
integral blower will be used. Remote
and inline blower installation requires
4 wires plus a ground wire to run from
the downdraft to the blower.
B. Make sure that adequate cabinet and
counter space has been provided and
that the intake and blower will be acces-
sible if service is required.
C. Consider that cross drafts created by
adjacent open windows, doors, air con-
ditioning, old heating vents, recessed
ceiling lights, and traffic patterns may
affect performance.
D. For gas cooktop installations make sure
that a minimum 10 square inch opening
is provided in the toe-kick or other cabi-
net area. Inadequate ventilation of the
cabinet below the cooktop may result in
flame outage when operating the vent
system.
E. Provide for air supply or "make-up
air" to the room where unit will be
installed. If "make-up air" is not provi-
ded, then problems, such as fireplace
chimney downdrafts, could result.