Greenheck PN 458294 User manual

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Installation, Operation and Maintenance Manual
Please read and save these instructions. Read carefully before attempting to assemble, install, operate or maintain the
product described. Protect yourself and others by observing all safety information. Failure to comply with instructions
could result in personal injury and/or property damage! Retain instructions for future reference.
®
PN 458294
Model Proximity (Backshelf)
Kitchen Hoods
1Proximity Hood

2Proximity Hood
®
ReceivingandHandling .............................................................3
HoodWeights .....................................................................3
Installation........................................................................4
HoodInstallationOverview...........................................................4
FillerPanels..................................................................... 4-5
HoodHangingHeight...............................................................5
ContinuousCapturePlenum..........................................................5
Ductwork.........................................................................6
ElectricalConnections ..............................................................6
ExternalSupplyPlenumWeights......................................................6
ExternalSupplyPlenumsInstallation...................................................7
BackSupplyPlenumInstallation......................................................8
HangingtheHood..................................................................9
EnclosurePanelInstallationInstructions........................................... 10-12
BacksplashPanelInstallationInstructions .............................................13
DuctCollarInstallationInstructions...................................................14
ExhaustAirBalancingBaffle(EABB)..................................................15
BalancingtheKitchenExhaust.......................................................16
Baffle Filters (GH Series) .................................................. 16-19
High Velocity Cartridge Filters (Gk Series) .................................... 20-21
High Efficiency Filters (GX Series) ..............................................23
FireSuppressionWiringDiagrams................................................ 24-25
OverallWiringPlanView............................................................26
WiringforSwitchPanels............................................................27
Maintenance .....................................................................28
Grease Grabber™ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 - 31
Troubleshooting............................................................... 32-34
ReplacementParts................................................................34
Table of Contents

3Proximity Hood
®
Upon receiving the equipment, check for both obvious and hidden damage. If damage is found, record all
necessary information on the bill of lading and file a claim with the final carrier. Check to be sure that all parts of
the shipment, including accessories, are accounted for.
STORAGE
If a kitchen hood must be stored prior to installation it must be protected from dirt and moisture. Indoor storage
is recommended. For outdoor storage, cover the hood with a tarp to keep it clean, dry, and protected from UV
(Ultra Violet) Radiation damage.
Improper storage which results in damage to the unit will void the warranty.
Hood weight is determined using a simple formula. Select the figures provided in columns A and B (see tables)
from the three respective categories—Hood Width, Filter Type and Hood Height—based on the hood received.
Total the three numbers in column A and the three numbers in column B. Place the sum for column A and the
sum for column B in the Hood Weight equation where shown and solve for the total Hood Weight.
Receiving and Handling
Hood Weights
IMPERIAL A B
Category 1: Hood Width (in.)
23 - 25 1.3 28
26 - 28 1.35 30
29 - 32 1.4 31.5
33 - 36 1.45 33.5
Category 2: Filter Type
Baffle 0.3 0
GX or Cartridge 0.4 0
Grease Grabber™ 1 0
Category 3: Hood Height (in.)
24 - 27 0 0
28 - 33 0.08 5
34 - 38 0.16 10
39 - 42 0.24 15
METRIC A B
Category 1: Hood Width (cm)
58.42 - 63.50 0.232 12.68
66.04 - 71.12 0.241 13.59
73.66 - 81.28 0.250 14.27
83.82 - 91.44 0.259 15.18
Category 2: Filter Type
Baffle 0.054 0
GX or Cartridge 0.071 0
Grease Grabber™ 0.178 0
Category 3: Hood Height (cm)
60.96 - 68.58 0.000 0
71.12 - 83.82 0.014 2.27
86.36 - 96.52 0.029 4.53
99.06 - 106.68 0.043 6.80
Example: A B
Category 1: Hood Width 23 - 25 1.3 28
Category 2: Filter Type Baffle 0.3 0
Category 3: Hood Height 24 - 27 0 0
Total: 1.6 28
Hood Weight Equation (lb.)
A x Length (in.) + B = Weight (lb.)
1.6 x 48 + 28 = 104.8 lb.
Example: A B
Category 1: Hood Width 58.42 - 63.50 0.232 12.68
Category 2: Filter Type Baffle 0.054 0
Category 3: Hood Height 60.96 - 68.58 0 0
Total: 1.6 28
Hood Weight Equation (kg.)
A x Length (cm.) + B = Weight (kg.)
0.286 x 121.92 + 12.68 = 47.5 kg.

4Proximity Hood
®
NOTE: If you have a Back Supply
Plenum, this must be installed before
the hood. Please see page 8 now.
Prior to installation, check with local
authorities having jurisdiction on
clearances to combustible surfaces.
With the hood still inside its packing
crate, position the unit beneath its
installation location.
Carefully remove the packing crate.
Place some protective material on
the floor next to the crate to avoid
damaging the hood as it is tipped on its side (Fig. 1). Tip the hood carefully onto the protective
material. If you have filler panels, see Fig. 2 below. If you have integral filler panels, no additional
installation is needed.
Fig. 1
Rear filler panels may be shipped loose for field
installaton or are integral to the hood. If fillers are
integral to hood, skip this section.
1. Uncrate the hood and lay it on the floor with
protective material between the hood and the floor.
2. Bolt the filler panels together with 5/16 in. bolts
from the hardware package.
3. Position the filler panels on the hood, and tack-
weld them to the hood back.
4. To allow for ease of cleaning, caulk the external
seams with NSF Approved silicone caulk
(GE SCS1009, or its equivalent). The caulk is
not provided.
Hood Top
Hood Back Backshelf
Bottom Filler Panel
5/16 x 3/4 in. (8 x 19 mm)
Bolts with Washers and Nuts Hood Front
Hood Front
If a Back Supply Plenum is provided, install first. Before raising hood, insert 1/2 in. (12.7 mm) diameter
threaded rod (by others) into hanger brackets on hood top. Check the engineering drawings or UL
label located on the inside of the hood for proper hood height above finished floor. Install filler panels
if needed. Raise and hang hood from adequate roof or ceiling supports and secure mounting flange
to the wall using lag bolts, or fasten to the Back Supply Plenum if provided. All hanger brackets must
be used and the hood must be properly supported while lifting to prevent damage or distortion to the
hood. The hood must be hung level to operate properly. After hood is secured, make the exhaust duct
connections. The fire system distributer must be contacted at this time. After the fire system has been
installed, mount the enclosures, then the supply plenums. If a Horizontal Supply Plenum is provided, it
should be installed according to the external supply plenum installation section found on page 7. The
hood and accessories are now installed. Finally, make the electrical connections from switches to fans
and complete the fire system circuits as required by the job specification.
Hood Installation Overview
Rear Filler Panel Installation Instructions
Fig. 2
Installation

5Proximity Hood
®
UL Vertical Distance
Above Cooking Surface
End filler panels may be shipped loose for field installaton or are facory mounted to the hood. If fillers
are factory mounted to hood, skip this section.
1. Uncrate the hood and lay it on the floor with protective material between the hood and the floor.
2. Bolt the filler panels together with 5/16 in. bolts from the hardware package.
3. Position the filler panels on the
hood and tack-weld them to the
appropriate side of the hood.
4. To allow for ease of cleaning,
caulk the external seams with
NSF Approved silicone caulk
(GE SCS1009, or its equivalent).
The caulk is not provided.
Note: Hood may be furnished with
finished end fillers when mounting
against a partial wall.
Fig. 4
Fig. 5
End Filler Panel Installation Instructions
End Filler Panels Fig. 3
The hood hanging height is critical, hanging the hood at the
incorrect height may significantly reduce the ability for the
hood to function properly and may be in violation of codes.
The hood hanging height is given on the UL label located
on the inside of the hood on the end panel. The distance
given is from the front lip of the hood (shown in Fig. 4) to
the surface of the cooking equipment.
Hood Hanging Height
Use the installation procedure described on
page 4 for single island hoods; install and
level both hoods. After leveling, secure the
hoods together. Fasten the hoods together
using u-clips and bolts. (Fig. 6) Caulk this
joint with NSF Approved silicone caulk (GE
SCS1009 or its equivalent). The caulk is not
provided.
2. RAI
S
E ALL H
OO
D
S
INT
O
APPR
O
PRIATE L
OC
ATI
O
N
AND
SU
PP
O
RT PER
CO
N
S
TR
UC
TI
O
N PLAN
S.
3. FASTEN TOP ANGLES TOGETHER USING 1/4 in. BOLTS & NUTS
(
BY OTHERS
).
4. FASTEN HOODS TOGETHER USING U-CLIPS
,
1/4 in. BOLT
S
5.
C
A
U
LK ALL
S
EAM
S
A
S
NE
C
E
SS
ARY
.
&
C
AP N
U
T
S
A
S
INDI
C
ATED
.
HOOD FRONT
1. REM
O
VE
SU
PP
O
RT AN
G
LE
O
N
O
PEN END PANEL
.
H
OOD
ACO
RN N
UT
B
O
L
T
U
-
C
LI
P
C
A
U
L
K
Continuous Capture Plenum Hoods
Fig. 6

6Proximity Hood
®
Ductwork
Electrical Connections
Access for wiring the hood control panel (when applicable) is provided by a junction box located on
top of the hood when the control panel is mounted in the hood, or by the switch junction box when the
control panel is mounted in the fire protection cabinet. The box is labeled “Control Voltage Wiring to
Roof Top Fan Package”. Use minimum 14 AWG copper wire.
Standard light switches for remote mounting are rated for 15 amps and shall not have more than 14
lights connected to them. Higher amperage switches are available upon special request.
Exhaust
As specified in NFPA 96, Ch. 7.5 (latest edition), exhaust duct systems must be constructed in the
following manner:
Materials. Ducts shall be constructed of and supported by carbon steel not less than 1.37 mm
(0.054 in.) (No. 16 MSG) in thickness or stainless steel not less than 1.09 mm (0.043 in.) (No. 18 MSG) in
thickness.
Installation. All seams, joints, penetrations, and duct-to-hood collar connections shall have a
liquid-tight continuous external weld.
Supply
Supply ductwork (where applicable) should be connected to the hood in a manner approved by the
local code authorities.
Note: For hoods with fire dampers in the exhaust and supply duct collars, an access panel for cleaning
and inspection shall be provided in the duct. This panel shall be as close to the hood as possible but
should not exceed 18 in. (45.72 cm).
For proper installation of duct collars when they are shipped unattached, see page 14
External Supply
Plenum Type
Weight Width Height Length per
section Recommended
Supply Rate
(lbs/ft) (kg/ft) (in) (mm) (in) (mm) (ft) (m)
Back Supply 35.0 15.878 6 152.4 Variable Variable 3 to 16 .91 to
4.88
145 cfm/ft
(246.36 m3/hr)
Air CurtainSupply
• 14 inch 9.5 4.31 14 355.6 10 254 3 to 16 .91 to
4.88
110 cfm/ft
(186.89 m3/hr)
Air Curtain Supply
• 24 inch 12.5 5.67 24 609.6 10 254 3 to 16 .91 to
4.88
145 cfm/ft
(246.36 m3/hr)
Variable Supply 16.0 7.26 12 304.8 18 457.20 3 to 16 .91 to
4.88 face 80-160 cfm/ft (135.92 -271.84 m3/hr)
Horizontal Supply 14.0 6.35 12 304.8 18 457.20 3 to 16 .91 to
4.88
150 cfm/ft
(254.85 m3/hr)
External Supply Plenum Weights, Dimensions, and Supply Rates

7Proximity Hood
®
Installation Instructions
1. If duct collar(s) is shipped loose,
place the duct collar(s) over the
opening, fastening with tack-
welds at 1 to 2 in. (2.54 to 5.08 cm)
intervals, or sheet metal screws
at 3 to 6 in. (7.62 to 15.24 cm)
intervals.
2. Insert 1/2 in. (12.7 mm) diameter
threaded rod (by others) into all
of the hanger brackets on the
supply plenum top. Raise external
supply plenum and hang level from
adequate roof or ceiling supports.
(Horizontal Supply Plenum shown
in Fig. 7, must be below finished
ceiling. Air Curtain Supply Plenum
may be fit into drop ceiling.)
3. Remove perforated panel from
plenum and bolt to enclosures
through back of plenum (Fig. 8).
This will draw plenum tight to the
enclosures. Fasteners are not
intended to support the plenum;
for alignment purposes only.
4. Caulk mating joints with
NSF Approved silicone caulk
(GE SCS1009, or its equivalent).
The caulk is not provided.
The purpose of the external supply plenum is to provide make-up air to an exhaust hood to maintain
the air balance in the space. The external supply plenum must be hung independent of the hood.
Follow the instructions for hanging the following supply plenums: Horizontal, Air Curtain and Variable.
See page 8 for Back Supply Plenum. If an external supply plenum is not provided, skip this section.
Support plenum from all
hangers provided
Bolt back of
plenum to
enclosures
External Supply Plenum Installation
Fig. 7
Fig. 8

8Proximity Hood
®
FASTENERS HOLDING THE
BACK SUPPLY TO THE WALL
32 in. (813 mm)
CRITICAL
DIMENSION
HANGER BRACKET
DETAIL
0.500 in. THREADED ROD
0.500 in. THREADED NUTS
(FURNISHED BY OTHERS)
FURNISHED BY
OTHERS
• These fasteners are to help maintain the location of
the Back Supply and are not intended to hold the
weight of the Back Supply Unit.
• The fasteners should not interfere with the removable
air diffusers.
L (MODULE WIDTH)
L/2
L/2
L/2
L (MODULE WIDTH)
L/4
L/2
STEP 1
CENTERED ON WIDTH OF THE SUPPLY,
CUT (2) 4 in. X 24 in. OPENINGS AT
THE SUGGESTED LOCATIONS ABOVE
(IF MODULE > 6 ft.)
THE SUGGESTED LOCATION ABOVE
CUT (1) 4 in. X 24 in. OPENING AT
CENTERED ON WIDTH OF THE SUPPLY,
(IF MODULE < 6 ft.)
STEP 1
4 in. TO 6 in.
FASTEN WITH SCREWS, OR TACK WELDS EVERY
PLACE THE DUCT COLLAR OVER THE OPENING,
STEP 2
L (MODULE WIDTH)
L/2
L/2
L/2
L (MODULE WIDTH)
L/4
L/2
STEP 1
CENTERED ON WIDTH OF THE SUPPLY,
CUT (2) 4 in. X 24 in. OPENINGS AT
THE SUGGESTED LOCATIONS ABOVE
(IF MODULE > 6 ft.)
THE SUGGESTED LOCATION ABOVE
CUT (1) 4 in. X 24 in. OPENING AT
CENTERED ON WIDTH OF THE SUPPLY,
(IF MODULE < 6 ft.)
STEP 1
4 in. TO 6 in.
FASTEN WITH SCREWS, OR TACK WELDS EVERY
PLACE THE DUCT COLLAR OVER THE OPENING,
STEP 2
• The 4 in. (10.16 cm)
high duct collar is to be
attached to the back
supply.
5. Hang the Back Supply Plenum from the ceiling.
The Back Supply Plenum needs to be mounted 31.25 in.
(79.375 cm) above the finished floor. This is measured
from the lowest rear edge of the Back Supply Plenum to
the finished floor.
6. Fasten the Back Supply to the wall, going through the
lower Back Supply wall. (Fig. 12)
Installing the Supply Duct Collar
1. Find the center of the Back Supply Plenum.
2. If the Back Supply Plenum is less than 9 ft. 10 in. (299.72 cm) long,
cut opening at the suggested location, centering the opening over
the center of the Back Supply Plenum. (Fig. 9)
3. If the Back Supply Plenum is greater than 9 ft. 10 in. (299.72 cm)
long, divide the length of the back supply by four. This will give you
the center of each half. Cut openings at the suggested location,
centering the duct collar over the center measurement of each
half. (Fig. 10)
4. Place the duct collar(s) over the opening, fastening with screws or
tack-welds every 4 to 6 in. (10.16 to 15.24 cm). (Fig. 11)
L (MODULE WIDTH)
L/2
L/2
L/2
L (MODULE WIDTH)
L/4
L/2
STEP 1
CENTERED ON WIDTH OF THE SUPPLY,
CUT (2) 4 in. X 24 in. OPENINGS AT
THE SUGGESTED LOCATIONS ABOVE
(IF MODULE > 6 ft.)
THE SUGGESTED LOCATION ABOVE
CUT (1) 4 in. X 24 in. OPENING AT
CENTERED ON WIDTH OF THE SUPPLY,
(IF MODULE < 6 ft.)
STEP 1
4 in. TO 6 in.
FASTEN WITH SCREWS, OR TACK WELDS EVERY
PLACE THE DUCT COLLAR OVER THE OPENING,
STEP 2
Fig. 9
Fig. 11
Installing the Back Supply Plenum
Hanging the Back Supply Plenum
Fig. 10
Fig. 12

9Proximity Hood
®
Note: The installation of the hoods shall be in accordance with NFPA 96 (latest edition), Standard for
Ventilation Control and Fire Protection of Commercial Cooking Operations.
Fig. 14 shows the locations where the
hood must be fastened. If a Back Supply
Plenum is part of the hood system,
please see pages 8-9, Back Supply
Plenum/Hood Installation.
To hang the hood:
1) Locate the studs in the wall.
2) Drill 1/2 in. (13 mm) diameter holes in
the hood mouting flange. Be sure to
align to wall studs.
3) Lift hood into a level position and
lag bolt hood to wall (fasteners by
others).
4) Bolt 1/2 in. (13 mm) threaded rod into
the hanger brackets.
5) Fasten threaded rod to ceiling
supports then level the hood.
Hood Mounting Instructions
Hanging the Hood with Back Supply Plenum
Before hanging the hood according to the hood
installation instructions, please check the following:
1. Make sure the back supply unit is properly
secured, as described in steps 5 and 6, page 8.
2. Any filler panels should be attached to the hood
before the hood installation.
To hang the hood:
1. Lift the hood and position it so the top of the
hood is even with the back supply (Fig. 13). This
height should correspond to the UL hanging
height of the hood.
2. After the hood is hung from the ceiling, a hood
mounting flange may be fastened to the back
supply using sheet metal screws (by others).
Pilot holes are recommended.
3. Connect the remaining ductwork for the back
supply and the hood. Caulk all mating seams
and surfaces of the back supply, the hood, and
the wall.
Hanger Brackets
Mounting Flange
Fig. 14
Fig. 13

10 Proximity Hood
®
Full Enclosure Panels
Before installing the enclosure panels, make sure the hood is hung in position with all the ductwork
attached and fire system connections completed.
1. Tack-weld or clamp end enclosure panels onto standing seam (clamps provided).
2. Attach the end enclosure panels to the wall (fasteners by others).
3. Position the front enclosure panel(s) on the hood and bolt to the end enclosure panels with the
5/16 in. bolts provided.
4. Tack-weld or clamp the front enclosure panel(s) to the standing seam. If clamps are used, they
must be positioned 4 in. (100 mm) from the ends and in the center of the front enclosure panel.
5. To allow for ease of cleaning, caulk the external seams with NSF Approved silicone caulk.
(GE SCS1009, or its equivalent). The caulk is not provided.
6. Installation instructions may not be applicable for concrete ceilings.
End Enclosures
Front Enclosure(s)
Standing Seams
Bolt Here
Fig. 15

11 Proximity Hood
®
Plate Shelf with Duct Enclosure Panels
Before installing the enclosure panels, make sure the hood is hung in position with all the ductwork
attached and the fire system connections completed. Plate shelf will be factory mounted to hood
(shown loose).
1. Tack-weld or clamp end enclosure panels into place (clamps provided).
2. Attach the end enclosure panels to the wall (fasteners are not provided).
3. Position the front enclosure panel(s) on the hood and bolt to the end enclosure panels with the
5/16 in. bolts provided.
4. Tack-weld or clamp the front enclosure panel(s) to the hood. If clamps are used, they must be
positioned 4 in. (100 mm) from the ends and in the center of the front enclosure panel.
5. To allow for ease of cleaning, caulk the external seams with NSF Approved silicone caulk.
(GE SCS1009, or its equivalent). The caulk is not provided.
6. Installation instructions may not be applicable for concrete ceilings.
End Enclosures
Front Enclosure(s)
Plate Shelf
Standing Seams
Fig. 16

12 Proximity Hood
®
Passover Shelf with Duct Enclosure Panels
Before installing the enclosure panels, make sure the hood is hung in position with all the ductwork
attached and fire system connections completed.
1. Attach mounting channels to the wall in the correct location.
2. Fasten end and front enclosure panels to Passover shelf with fasteners provided.
3. Bolt front and end enclosure panels together with the 5/16 in. bolts provided in the hardware
package.
4. Place enclosure assembly on hood top, tack-weld shelf to hood in rear corners.
5. Attach the end enclosure panels to mounting channels (fasteners provided).
6. To allow for ease of cleaning, caulk the external seams with NSF Approved silicone caulk.
(GE SCS1009, or its equivalent). The caulk is not provided.
7. Installation instructions may not be applicable for concrete ceilings.
End Enclosures
Front Enclosure
Passover Shelf
Mounting Channels
Fig. 17

13 Proximity Hood
®
MATERIAL GAUGE — STAINLESS
MATERIAL GAUGE — STAINLESS
INSULATION — 1 IN. (25.4 MM)
FLAT BACKSPLASH PANEL
INSULATED BACKSPLASH PANEL
WALL
WALL
NOTE: PANELS UP TO 46 IN. (1168.4 MM) WIDE SHIP IN ONE PIECE; OVER 46 IN. (1168.4 MM) IN MULTIPLE PIECES.
NOTE: PANELS UP TO 48 IN. (1219.2 MM) WIDE SHIP IN ONE PIECE; OVER 48 IN. (1219.2 MM) IN MULTIPLE PIECES.
LENGTH
1 IN. (25.4 MM)
HEIGHT
LENGTH
HEIGHT
Backsplash Panel Installation Instructions
Fig. 18
1. Layout backsplash panels
according to Fig. 18
Note offset in panel for overlap.
If the backsplash panel length
is greater than 46 in. (1168.4
mm), it will be shipped in
multiple pieces. Be sure offsets
match up to other panels.
2. Insulated Panels extend
1 inch from the wall
(Fig. 19). Bottom edge of
hood must mount tight to
top of panel. Check hood
mounting height before
panel installation.
3. After the backsplash
panel has been
positioned, drill holes
in the panel and fasten
to the wall. (fasteners
provided by others).
4. Caulk the joints between
the hood and the
backsplash panel with
NSF Approved silicone
caulk. (GE SCS1009,
or its equivalent). The
caulk is not provided.
When multiple panels
are required, caulk
the joint between the
backsplash panels with
NSF approved silicone
caulk (GE SCS1009, or its
equivalent). The caulk is
not provided.
LENGTH QTY
Inches Millimeters
<= 48 <= 1219.2 1
>48<=94 >1219.2<=2387.6 2
>94<=141 >2387.6<=3581.4 3
>141<=188 >3581.4<=4775.2 4
>188<=235 >4775.2<=5969 5
MATERIAL GAUGE — STAINLESS
MATERIAL GAUGE — STAINLESS
INSULATION — 1 IN. (25.4 MM)
FLAT BACKSPLASH PANEL
INSULATED BACKSPLASH PANEL
WALL
WALL
NOTE: PANELS UP TO 46 IN. (1168.4 MM) WIDE SHIP IN ONE PIECE; OVER 46 IN. (1168.4 MM) IN MULTIPLE PIECES.
NOTE: PANELS UP TO 48 IN. (1219.2 MM) WIDE SHIP IN ONE PIECE; OVER 48 IN. (1219.2 MM) IN MULTIPLE PIECES.
LENGTH
1 IN. (25.4 MM)
HEIGHT
LENGTH
HEIGHT
Fig. 19
LENGTH QTY
Inches Millimeters
<= 46 <= 1168.4 1
>46<=91 >1168.4<=2311.4 2
>91<=136 >2311.4<=3454.4 3
>136<=181 >3454.4<=4597.4 4
>181<=226 >4597.4<=5740.4 5

14 Proximity Hood
®
Exhaust Ducts
1. If the exhaust duct has been factory mounted, skip this section.
2. The exhaust duct must be located within the shaded region of Fig. 20. Note dimensions.
Dimension Y assumes a 3 in. (76.2 mm) integral airspace on the hood back. When no 3 in.
(76.2 mm) integral airspace is present, Y=0 in. (0 mm).
3. Cut out appropriate size hole to match the duct collar provided.
4. The exhaust duct connection is to be a continuous liquid-tight weld.
Supply Ducts
Proximity hoods do not have integral supply plenums. Reference External Supply Plenums (Page 7).
FRONT OF HOOD
HANGER BRACKET
EXHAUST PLENUM
DUCT CUT OUT AREA
x
y
The final fire system hook-up must be completed at this time. Unobstructed access is required for the
fire system installer to make plumbing connections to various locations on the hood top. Do not install
any enclosures until the fire system installation is complete.
Duct Collar Installation
Fig. 20
X= 12 in. (304.8 mm)
Y= 3 in. (76.2 mm)
Fire System Installation

15 Proximity Hood
®
This is a guide to assist in determining if multiple hoods on one fan can be balanced to have equal
static pressure. For multiple hoods on one fan to achieve their designed exhaust flow, all of the hoods
must have equal static pressure at their designed exhaust flow.
The laws of physics force the static pressure for each branch of a duct system on one fan to always be
equal. This will happen by the flow rate increasing in low static branches and decreasing in high static
branches until the static pressure is equal in all branches.
Checking for Balance
Every hood with Exhaust Air Balancing Baffles (EABB) has a range for its static pressure. The low
number in this range is given by the standard calculation for hood static. (Static that is printed with
the CAPS submittal). The maximum increase above the low number can be calculated from the duct
velocity at the low static, (also given on CAPS submittal). This is then added to the low number to get
the highest static pressure possible with an EABB.
The maximum potential increase in static is given in the graph, or can be calculated from:
Max. Increase = 0.00000036 x (Duct velocity)2
After the range for each hood is calculated, it
should be compared to the hood with the highest
static pressure. If the highest hood falls inside of
the range, then the hoods can be balanced with
the EABB. If it is higher than the range, the hoods
cannot be balanced.
Example 1:
Hood 1: Ps = 0.58 in. wg
Duct Velocity = 1900 FPM
Hood 2: Ps = 0.44 in. wg.
Duct Velocity = 1800 FPM
Hood 2 has the lower Ps, at 1800 FPM the maximum increase in Ps is 1.17. The range for Hood 2 is
0.44 to 1.61. Hood 1 is less than 1.61 so these hoods can be balanced.
Example 2:
Hood 3: Ps = 2.00 in. wg
Duct Velocity = 2000 FPM
Hood 4: Ps = 0.44 in. wg
Duct Velocity = 1500 FPM
Hood 4 has the lower Ps, at 1500 FPM the maximum increase in Ps is .81. The range for Hood 4 is 0.44
to 1.25. Hood 3 is higher than 1.25 so these hoods cannot be balanced.
Note 1: For many systems, an EABB may not be needed on the hood that has the highest static pressure. The
exception to this is if the individual ductwork has uneven static pressures.
Note 2: When sizing the fan, use the static pressure from the highest hood and sum the CFM from all the hoods.
Maximum Increase in Static Pressure for Exhaust Air Balancing Baffle
(Fully Closed)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
500 1000 1500 2000 2500 3000 3500
Duct Velocity FPM
Increase in Collar Staitc Pressure
Exhaust Air Balancing Baffles (EABB)

16 Proximity Hood
®
Baffle Filter Style Hoods
A. Exhaust:
With all the filters in place, determine the
total hood exhaust volume with a rotating
vane anemometer as follows:
1. All cooking equipment should be on.
2. Measure the velocities
Velocity measurements should be
taken at five locations per filter. These
must be over a filter slot as in Fig. 21.
x
x
x
x
x
Rotating Vane Anemometer
Airflow
2
H/4
H/2
H/4
H
Fig. 21
A. To determine the proper dining room air balance:
1. Refer to engineering drawings to determine total exhaust CFM from dining areas.
(Exhaust fans, heating and air conditioning units, restrooms, etc.)
2. Determine the total CFM of make-up air supplied to dining area.
3. Subtract #1 from #2 above. If the result is a negative number, a negative pressure is present
in the dining area. In this case, kitchen exhaust odors could be drawn from the kitchen to the
dining area. Therefore, exhaust or supply air should be adjusted to provide a slight positive
pressure in the dining area.
B. To determine proper kitchen air balance:
1. Refer to engineering drawings to determine total exhaust from the kitchen area.
(Exhaust hoods, dishwasher hoods, etc.)
2. Determine total CFM of make-up air supplied to kitchen area.
(Make-up air hoods, heating and air conditioning units, etc.)
3. Subtract #1 from #2 above. The result should be a negative number. If the result is a positive
number, a positive pressure is present in the kitchen area. Kitchen odors could be forced into
the dining area. Also, a positively balanced kitchen area can adversely affect the performance
of the exhaust hood.
Caution: According to NFPA 96, Ch. 8-3 Replacement Air: Replacement air quantity shall be adequate
to prevent negative pressures in the commercial cooking area(s) from exceeding 4.98 kPa (0.02 in.
water column).
Balancing the Kitchen Exhaust System
Testing Hood Air Volume

17 Proximity Hood
®
Measure the velocity of each location.
A digital 2.75 in. (70 mm) rotating
vane anemometer or equivalent
is suggested. The center of the
anemometer should be held 2 in.
(50 mm) from the face of the filters
as shown in Fig. 22. It is helpful
to make a bracket to keep the
anemometer at the 2 in. (50 mm)
distance and parallel to the filter.
Both squareness and distance are
very important for accuracy.
Calculate the average velocity for the filter.
3. Determine the filter’s conversion factor from the table.
4. Calculate the filter’s volume in CFM (m3/hr) by multiplying the average velocity by the
conversion factor.
5. Calculate the hood’s volume by repeating the process for the remaining filters and summing the
individual filter volumes.
x
x
x
x
x
2 in.
H/4
H/2
H/4
H
Airflow
Rotating Vane Anemometer
Fig. 22
255
(4663.44 m/h)
248
(4535.42 m/h)
256
(4681.73 m/h)
240
(4389.12 m/h)
250
(4572 m/h)
Nominal Filter Size (H x L) Imperial
Conversion Factor
Metric
Conversion Factor
Inches Millimeters
16 x 16 400 x 400 1.63 .157
16 x 20 500 x 400 2.13 .198
20 x 16 400 x 500 1.90 .177
20 x 20 500 x 500 2.48 .230
Total hood volume = (Filter 1 Volume) + (Filter 2 Volume) + (Filter 3 Volume)
= 474.6 + 455.4 + 470.1 = 1400.1 cfm
= 809 + 880 + 799 = 2488 m3/hr
For a nominal filter size of 20 x 16, the conversion factor is 1.90 Imperial (.177 Metric)
Volume for one filter = Conversion Factor x Average Velocity
= 1.90 x 249.8 fpm = 474.6 cfm
= .177 x 4568 m/hr = 809 m3/hr
Example: Exhaust Only Hood with three 20 x 16 Filters
Measured velocities in fpm for one 20 x 16 Filter
Average Velocity = Sum of Velocity Readings
Number of Readings
(Imperial) =255 + 250 + 256 + 248 + 240
5 = 249.8 fpm
(Metric) =4663 + 4572 + 4681 + 4535 + 4389
5 = 4568 m/hr

18 Proximity Hood
®
B. Supply (If Applicable):
Example for Perforated Face Supply
1. Hood set up
If the make-up air unit has a temperature control, it should be used to keep the supply air at the
desired room discharge air temperature.
2. Measure Velocities
Divide the perforated face panel into a grid of equal areas, each approximately 4 in. (100 mm)
square.
Measure the velocity at the center of each grid area. A digital 2.75 in. (70 mm) rotating vane
anemometer or equivalent is suggested. The center of the anemometer should be held tight to
the face of the panel, and parallel to the filter. Both squareness and distance are important for
accuracy. Calculate the average velocity of the panel.
3. Measure the length, height, and width of the perforated face panel.
4. Calculate the perforated face panel volume in CFM by using the following formula:
Volume = Avg. Velocity *Length (in.) *Height (in.) *0.005
Volume = Avg. Velocity *Length (m) *Height (m) *0.72
5. Calculate the system’s volume by repeating the process for the remaining panels and adding
the individual panel volumes together.
Total system volume = (Panel 1 Volume) + (Panel 2 Volume) + (Panel 3 Volume)
= 606.4 + 614.3 + 593.8 = 1814.5 cfm
= 1029 + 1044 + 1009 = 3082 m3/hr
Example: Face Supply Hood with three 28 in. (.711 m) Perforated Panels
Measured velocities in FPM for one perforated panel
Average Velocity = Sum of Velocity Readings
Number of Readings
(Imperial) =260 + 250 + … + 265 + 260
28 = 270.7 fpm
(Metric) =4755 + 4572 + … + 4846 + 4755
28 = 4951 m/hr
Measure Length and Height = 28 in. (.711 m) long perforated panels x 16 in. (.406 m) high
Volume for one panel = Conversion
Factor xAverage Velocity x Length x Height
= 0.005 x 270.7 fpm x 28 x 16 = 606.4 cfm
= 0.72 x 4951 m/hr x .711 x .406 = 1029 m3/hr
Filter Readings (fpm)
260 250 255 260 250 255 265
270 275 270 280 265 265 270
290 285 280 280 275 290 295
285 275 280 260 270 265 260
Filter Readings (m/hr)
4755 4572 4663 4755 4572 4663 4846
4938 5029 4938 5121 4846 4846 4938
5304 5212 5121 5121 5029 5304 5395
5212 5029 5121 4755 4938 4846 4755

19 Proximity Hood
®
Testing Hood Air Volume
17.25 in.
10 in.
6 in.
2.75 in.
14 in.
Fig. 24
Fig. 25
Fig. 26
10 in.
10 in.
Baffle Filters Style Hoods with the Shortridge Meter
A. Exhaust
With all the filters in place, determine the total hood exhaust
volume with a shortridge meter as follows:
1. All cooking equipment should be on. If the hood has
internal short circuit make-up air, it should be turned off.
2. Measuring Velocities
• Set up the shortridge meter.
• For 20 in. (500 mm) wide filters, position the grid as
shown in Fig. 24 and 25. Average two measurements.
• For 16 in. (400 mm) wide filters position the grid as
shown in Fig. 26.
• Take velocity readings for each filter.
3. *Calculate each filter’s volumetric flow rate by summing
the flow rate of each individual filter in the hood.
4. *Calculate the total hood’s volumetric flow rate by
summing the flow rate of each individual filter in the hood.
*Note: For best accuracy multiply the velocity of each filter by its
conversion factor and sum the flow rates Averaging the velocity
measured for all filters may cause error.
Fig. 23
Example: Measured velocities for 20 x 20 filter = 185 and 189 fpm
Average Velocity = Sum of Velocity Readings
Number of Readings
(Imperial) =185 + 189
2 = 187.0 fpm
(Metric) =3383 + 3456
2 =3420 m/hr
Flow rate for one filter = Conversion
Factor xAverage Velocity
= 2.40 x 187.0 fpm = 448.8 cfm
= .223 x 3420 m/hr = 763 m3/hr
Total hood flow rate = (Filter 1
Flow Rate) +…+ (Filter X Flow Rate)
= 448.8 + 457.8 + 437.5 + 444.8 = 1788.9 cfm
= 763 + 778 + 743 + 756 = 3040 m3/hr
Nominal Filter Size (H x L) Imperial
Conversion Factor
Metric
Conversion Factor
Inches Millimeters
16 x 16 400 x 400 1.66 .154
16 x 20 400 x 500 2.10 .195
20 x 16 500 x 400 1.96 .182
20 x 20 500 x 500 2.40 .223
14 in.
2.75 in.

20 Proximity Hood
®
High Velocity Cartridge Filters
Rotating Vane
Anemometer
2 in.
Fig. 27
A. Exhaust
With all the filters in place, determine the total hood exhaust
volume with a rotating vane anemometer as follows:
1. All cooking equipment should be on. If the hood has
internal short circuit make-up air, it should be turned off.
2. Measuring Velocities
• Velocity measurement should be taken at three locations per filter.
These must be over the inlet opening as shown in Fig. 27.
• Measure the velocity of each location. A digital 2.75 in. (70 mm)
rotating vane anemometer or its equivalent is suggested. The center
of the anemometer should be held 2 in. (50 mm) from the face of
the filters as in Fig. 28. It is helpful to make brackets to keep the
anemometer at the 2 in. (50 mm) distance and parallel to the filter.
Both squareness and distance are important for accuracy.
3. Calculate the average slot velocity.
4. Calculate the CFM per linear foot by dividing the average velocity by a
conversion factor listed in the following table.
5. Calculate the hood’s exhaust volume by multiplying the CFM per linear
foot by the length of hood.
1/4 Width
1/4 Width
1/2 Width
1/2 Height
Inlet Height
Filter Height
Fig. 28
Cartridge Filter Size Imperial
Conversion Factor
Metric
Conversion Factor
16 in. (400 mm) high with 4 in. (100 mm) high inlet 1.63 1/ft35.35 1/m3
20 in. (500 mm) high with 4 in. (100 mm) high inlet 2.15 1/ft37.05 1/m3
16 in. (400 mm) high with 7 in. (120 mm) high inlet 1.24 1/ft34.07 1/m3
20 in. (500 mm) high with 7 in. (120 mm) high inlet 1.58 1/ft35.18 1/m3
Filter Readings (fpm)
470 440 425
482 430 453
455 431 441
399 439 465
Filter Readings (m/hr)
8595 8047 7772
8815 7864 8284
8321 7882 8065
7297 8028 8504
Example:
Measure the slot velocities in fpm for a 9 ft. (2.74 m) hood with four 20 x 20 in. (500 x 500 mm)
filters with standard opening, three readings per filter.
Average slot velocity = Sum of Velocity Readings
Number of Readings
(Imperial) =5330
12 = 444.2 fpm
(Metric) =97474
12 = 8123 m/hr
CFM per linear foot = Average Slot Velocity
Conversion Factor
=444.2 fpm
2.15 = 206.6 cfm/linear foot
=8123 m/hr
7.05 = 1152 m3/hr
Hood exhaust volume = CFM/linear foot (or m3/hr / m) x Hood Length
= 206.6 x 9 ft. = 1859.4 cfm
= 1152 x 2.74 m = 3156 m3/hr