Introduction, General description, Step 1: plan the installation – Bosch DHD User Manual

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Figure 1

Strain Relief

Internal Blower
(Not Included)

Top Cap

INTRODUCTION

GENERAL DESCRIPTION

The complete downdraft system consists of the ventilator,
the intake and the blower (See Fig. 1). The blower can be
either integral (mounted on the vent intake in the cabinet
under the cooktop) or a remote (mounted on the roof or
outside wall. When a remote blower is used, a duct transi-
tion is mounted on the ventilator intake in place of the
integral blower to connect the intake to the ductwork. 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 and 36-inch
models, It is intended for use with all brands and models of
residential 30-inch or 36-inch gas or electric cooktops
except professional style cooktops.

Step 1: PLAN THE INSTALLATION

Carefully follow the planning procedures listed below (See
Figure 2).
A. Determine whether a remote or integral blower will be

used. Remote 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 will be accessible
if service is required.

C. Consider that cross drafts created by adjacent open

windows, doors, air conditioning, old heating vents,
recessed ceiling lights, and traffic patterns may affect
performance.

D. For gas cooktop installations make sure that a mini-

mum 10 square inch opening is provided in the toe-kick
or other cabinet 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
provided, then problems, such as fireplace chimney
downdrafts, could result.

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