Design Guide
1–800–944–2904 | bosch-home.com/us
Ventilation — 800 Series Downdraft Hoods
Downdraft Hoods Flexible Blower Installation | 800 Series | Ventilation | 153
800 Series Downdraft Hoods
Flexible Blower Installation – Rear Exhaust Example
152 | Ventilation | 800 Series | Downdraft Hoods Flexible Blower Installation
Application
•  Rear exhaust option is possible if ducting is more convenient with 
this configuration
•  Requires at least 18" of clearance to fit the blower and transition
• Blower must be accessible for maintenance
• Can be used with optional Recirculation Kit, sold separately
• Elbow, ductwork, blower support structure frame not included
DHG602DUC 
600 CFM Flexible Integral 
Blower
600 CFM flexible blower can 
mount to downdraft or be 
used as an inline blower, and 
can be rotated to exhaust 
downward or to sides
Required Blower
Required Accessories Required Accessories
HDDSTRAN8 
8" Side / Rear Transition  
for Downdraft
8" Round transition 
enable ducting to be 
at sides or rear of 
downdraft for flexible 
configurations to 
maximize your kitchen 
design
NOTE: HDDSTRAN8 side / 
rear transition required for 
side or rear exhaust 
applications with inline 
and remote blowers.
Optional Accessories
Optional Accessories
HDDREC5UC 
Recirculation Kit for Downdraft
When ducting to the exterior is not 
feasible, downdraft recirculation 
kit allows filtered air to reenter 
the kitchen while cooking
HDDREC5UC 
Recirculation Kit for Downdraft
When ducting to the exterior 
is not feasible, downdraft 
recirculation kit allows 
filtered air to reenter 
the kitchen while cooking
HDDFILTUC 
Charcoal Filter Replacement for Recirculation 
Kit for Downdraft 
Maintain performance of Bosch downdraft 
recirculation kit with timely replacement 
of charcoal filter to capture and filter odors
HDDFILTUC 
Charcoal Filter Replacement for Recirculation 
Kit for Downdraft 
Maintain performance of Bosch downdraft 
recirculation kit with timely replacement 
of charcoal filter to capture and filter odors
HDD0RSP 
30" Gas Cooktop Seal Kit for Downdraft 
30" gas cooktop seal kit required for 
installation with 30" gas cooktops
HDD0RSP 
30" Gas Cooktop Seal Kit for Downdraft 
30" gas cooktop seal kit required for 
installation with 30" gas cooktops
HDD6RSP 
36" Gas Cooktop Seal Kit for Downdraft 
36" gas cooktop seal kit required for 
installation with 36" gas cooktops
HDD6RSP 
36" Gas Cooktop Seal Kit for Downdraft 
36" gas cooktop seal kit required for 
installation with 36" gas cooktops
NOTE: Some applications may require deeper cabinets. Side and rear exhaust require at least 18" of clearance to fit the blower and / or ductwork. Refer to installation 
instructions.
800 Series Downdraft Hoods
Flexible Blower Installation – Recirculation Example
Application
•  Allows for non-ducted downdraft installation by eliminating the 
need to exhaust to the exterior of the home
•  Mount to toe kick or base of a cabinet and attach directly to 
flexible blower
• Recirculation module and metal grill vent plate placement can be 
rotated for flexible exhaust placement
• Elbow, ductwork, blower support structure frame not included
DHG602DUC 
600 CFM Flexible Integral 
Blower
600 CFM flexible blower can 
mount to downdraft or be 
used as an inline blower, and 
can be rotated to exhaust 
downward or to sides
Required Blower
Page 5
INSTALL THE 
RECIRCULATION BOX
1.  Cut opening in cabinet base.
•   Size: 14 1/2” (368) x 15” (380) 
•   Orientation depends upon direction of exhaust.
•   Double-check that blower outlet and recirculation box inlet will align.
2.  Temporarily place recirculation box into opening in cabinet base.
•   Rotate back of box up slightly and insert exhaust end down into opening.
•   Mark location of exhaust opening in toe space, rear, or side of cabinet.
3.  Remove recirculation box from opening.
4.  Cut exhaust opening.
•   Size: 3 1/2” (89) x 14 1/4” (362)
•   This opening will be covered with decorative grille.
5.  Replace recirculation box into opening in cabinet base.
•   If necessary, attach a length 3 1/4” (83) x 14” (356) duct extension (not 
included) to extend from recirculation box outlet to decorative grille 
location.
•   Seal the duct connection(s) with aluminum tape to make them secure and 
air tight. Do not use duct tape.
•   Use 6 - #10 x .625” screws to secure recirculation box to cabinet base.
6.  Install blower.
•   See blower instructions.
•   Use 8” (203) round duct to connect blower exhaust to recirculation box 
inlet
•   Seal the duct connections with aluminum tape to make them secure and 
air tight. Do not use duct tape.
•   Drill 1/8” (3) pilot holes through top of recirculation box and attach legs 
to recirculation box with 4 - #8 x .375” screws.
7.  Install decorative grille.
•   Use screws provided.
8. 
•  
•  
•  
CUSTOM-MADE 
DECORATIVE GRILLE
You can make your own decorative grille. Use the decorative grille in 
this kit as a template for the overall size and mounting hole locations. 
The grille opening pattern is up to you.
2
 min.
FILTER REPLACEMENT
6 months. However, this may vary, depending upon the type and 
amount of cooking you do. Call customer service or your local 
ALIGN BLOWER 
OUTLET WITH 
RECIRCULATION 
BOX INLET
METAL 8” ROUND DUCT 
(per local codes)
EXHAUST THROUGH 
CABINET FRONT (TOE KICK)
BLOWER
EXHAUST THROUGH 
CABINET SIDE
EXHAUST THROUGH 
CABINET BACK
Blower mounted 
to downdraft using 
mounting legs.
BLOWER
Blower mounted to 
framing in remote 
location - using 
mounting brackets.
MOUNTING
LEGS
Blower outlet and 
recirculation box 
inlet must align. 
(See below.)
OPTIONAL REMOTE BLOWER MOUNT
EXHAUST
THROUGH
CABINET 
BACK
EXHAUST
THROUGH
CABINET 
SIDE
15”
(380)
14 1/2”
(368)
3 1/2" (89) x 14 1/4" (362)
EXHAUST OPENING
DECORATIVE
GRILLE
15"
(380)
14 1/2"
(368)
3 1/2" (89) x 14 1/4" (362)
EXHAUST OPENING
DECORATIVE
GRILLE
Measurements 
in inches (mm).
DIMENSIONS
4 1/2”
(114)
16”
(406)
8”
(203)
6 1/2”
(165)
12 1/4”
(311)
17 1/2”
(445)
16”
(406)
14”
(356)
16”
(406)
15”
(380)
3 1/4”
(83)
3 3/4
”
(95)
Measurements 
in inches (mm).
Page 5
INSTALL THE 
RECIRCULATION BOX
1.  Cut opening in cabinet base.
•   Size: 14 1/2” (368) x 15” (380) 
•   Orientation depends upon direction of exhaust.
•   Double-check that blower outlet and recirculation box inlet will align.
2.  Temporarily place recirculation box into opening in cabinet base.
•   Rotate back of box up slightly and insert exhaust end down into opening.
•   Mark location of exhaust opening in toe space, rear, or side of cabinet.
3.  Remove recirculation box from opening.
4.  Cut exhaust opening.
•   Size: 3 1/2” (89) x 14 1/4” (362)
•   This opening will be covered with decorative grille.
5.  Replace recirculation box into opening in cabinet base.
•   If necessary, attach a length 3 1/4” (83) x 14” (356) duct extension (not 
included) to extend from recirculation box outlet to decorative grille 
location.
•   Seal the duct connection(s) with aluminum tape to make them secure and 
air tight. Do not use duct tape.
•   Use 6 - #10 x .625” screws to secure recirculation box to cabinet base.
6.  Install blower.
•   See blower instructions.
•   Use 8” (203) round duct to connect blower exhaust to recirculation box 
inlet
•   Seal the duct connections with aluminum tape to make them secure and 
air tight. Do not use duct tape.
•   Drill 1/8” (3) pilot holes through top of recirculation box and attach legs 
to recirculation box with 4 - #8 x .375” screws.
7.  Install decorative grille.
•   Use screws provided.
8. 
•  
•  
•  
CUSTOM-MADE 
DECORATIVE GRILLE
You can make your own decorative grille. Use the decorative grille in 
this kit as a template for the overall size and mounting hole locations. 
The grille opening pattern is up to you.
2
 min.
FILTER REPLACEMENT
6 months. However, this may vary, depending upon the type and 
amount of cooking you do. Call customer service or your local 
ALIGN BLOWER 
OUTLET WITH 
RECIRCULATION 
BOX INLET
METAL 8” ROUND DUCT 
(per local codes)
EXHAUST THROUGH 
CABINET FRONT (TOE KICK)
BLOWER
EXHAUST THROUGH 
CABINET SIDE
EXHAUST THROUGH 
CABINET BACK
Blower mounted 
to downdraft using 
mounting legs.
BLOWER
Blower mounted to 
framing in remote 
location - using 
mounting brackets.
MOUNTING
LEGS
Blower outlet and 
recirculation box 
inlet must align. 
(See below.)
OPTIONAL REMOTE BLOWER MOUNT
EXHAUST
THROUGH
CABINET 
BACK
EXHAUST
THROUGH
CABINET 
SIDE
15”
(380)
14 1/2”
(368)
3 1/2" (89) x 14 1/4" (362)
EXHAUST OPENING
DECORATIVE
GRILLE
15"
(380)
14 1/2"
(368)
3 1/2" (89) x 14 1/4" (362)
EXHAUST OPENING
DECORATIVE
GRILLE
Measurements 
in inches (mm).
DIMENSIONS
4 1/2”
(114)
16”
(406)
8”
(203)
6 1/2”
(165)
12 1/4”
(311)
17 1/2”
(445)
16”
(406)
14”
(356)
16”
(406)
15”
(380)
3 1/4”
(83)
3 3/4
”
(95)
Measurements 
in inches (mm).
* For only front downward ducting applications, electrical panel must be remotely mounted. Electrical panel can still be remotely mounted in other exhaust configurations if 
desired. Electrical panel interconnect cable length is 5-ft. long.
should this footnote be here? No 
corresponding * in the content above










