Greenheck CRD-1WT User manual

Receiving and Handling
Upon receiving dampers, 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.
Dampers must be kept dry and clean. Indoor storage
and protection from dirt, dust and the weather is
highly recommended. Do not store at temperatures in
excess of 100°F (38°C).
Safety Warning
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, injury
or death. Read the installation, operating, and
maintenance instructions thoroughly before installing
or servicing this equipment.
These instructions describe the installation of a
CRD-1WT or CRD-2WT in designs: L528, L546, L558,
L562, L574, L576, L581, L583, L585, L592, M501, M503,
M508, P533, P538, P545, P547, P548, P554, and P580
as detailed in the UL Fire Resistance Directory.
1
2
7
3
4
5
8
6
Number Description
1 Flooring Systems
2Wood Truss
3 Air Ducts
4 CRD-1WT or CRD-2WT assembly
5Mounting Angle
6 Resilient Channel
7 Gypsum Board
8 Grille (not supplied)
9Finishing System
(not shown)
Table of Contents
General Information . . . . . . . . . . . . . . . . . . 2
Pre-Installation Guidelines . . . . . . . . . . . . . . 3
Installation - Hanger Method . . . . . . . . . . . . . 3
Installation - Base Mount Method . . . . . . . . . . . 5
Field Installation of Steel Plenums for CRD-1WT . . . 6
Fabrication of Fiberglass Ductboard Plenum for
CRD-1WT . . . . . . . . . . . . . . . . . . . . . . . 7
®
CRD-1WT & CRD-2WT 1
Document 474094
CRD-1WT and CRD-2WT
Installation, Operation and Maintenance Manual
Please read and save these instructions for future reference. 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 these instructions will result in voiding of the product warranty and may result in personal injury
and/or property damage.

W*
H*
Figure 2
General Information
“UL CLASSIFIED (see complete marking on
product)”
“UL CLASSIFIED to Canadian safety standards
(see complete marking on product)”
Standard 555C (Listing #R13446)
GA File No. UL Design No.
FC 5012 M508
FC 5078 L558
FC 5101 L574, M508
FC 5119 L592
FC 5121 L528, L546, L574, M508
FC 5514.4 L585
FC 5515 L528
FC 5515.3 M503
FC 5516 L528
FC 5519 L574
FC 5521 L562
FC 5528 L528
RC 2603 P533
RC 2604 P554
RC 2606 P545
RC 2609 P538
RC 2612 P545, P554
GA = Gypsum Association Fire Resistance Manual
22nd Edition
Installation Supplements
Refer to the appropriate Greenheck installation
supplements for special requirements
(www.greenheck.com links are underline):
• Fusible Link Replacement for Volume Controller
Online version of this installation is available at
www.greenheck.com.
CRD-1 and CRD-2WT
instructions
Pre-Installation Guidelines
1) CRD’s are shipped from the factory with the blades in the closed position. The fusible link must be installed at the
time of installation such that the blades are held open as shown in Figure 2.
2) Fasteners (screws, bolts, rivets, etc. ) used for installation must not interfere with blade operation.
3) Flexible duct must be class 1 or 0 type, bearing the UL listed mark. Steel duct must be a minimum 28 ga. (.5 mm)
and maximum of 20 ga. (1 mm).
4) Ceiling damper must be installed as described in these installations.
5) Ceiling penetrations shall be located between floor/ceiling trusses.
6) The CRD-1WT’s supplied without a factory supplied plenum box require a steel or ductboard plenum to be field
installed (see pages 4 - 6). The CRD-2WT’s are always provided with a factory supplied plenum box.
7) Dampers shipped with factory attached plenums MUST be installed prior to sheetrock ceiling installation.
CRD-1WT & CRD-2WT2

Installation
Important note for CRD-1WT’s: For grille mount installations the damper blades shall be a maximum of 31⁄4in. (83
mm) above the top of the ceiling plane. For duct mount installations the damper blades shall be a maximum of 1⁄8in.
(6 mm) above the top of the ceiling plane.
Hanger Method
The hanger method is the standard mounting method for CRD-1WT’s. It may also be used in lieu of the base mount
method (see below) with the CRD-2WT. However, the hanging wire or straps would have to be field supplied.
1) Dampers shall be supported in a minimum of two places on opposite sides of the damper with a minimum
11⁄2in. x 24 gauge steel strip, 18 swg vertical hanger wire or 3⁄4in. x 3⁄4in. x 26 gauge vertical angle. The vertical
angle, steel strip, or hanger wire shall in turn be supported by a minimum 3⁄4in. x 3⁄4in. x 26 gauge steel angle or
nominal 2 in. x 4 in. wood support studs. The horizontal support angles or studs shall be fastened at each end
to adjacent trusses with minimum 16d nails, No. 8 screws or bolts. Only one connection per end is required (see
Figures 3 - 5).
For Grille Mount Installations
1) The grille/diffuser frame shall be steel. The grille/diffuser shall be attached with a minimum 4 - 1 in. long #6 screws
run through the gypsum wall board into the plaster flange (Figure 3 & 4).
For Duct Mount Installations
1) The duct retaining angles, 1 in. x 1 in. x 24 gauge, shall be installed on all four sides and shall be attached with a
minimum of 4 - 1 in. long #6 screws run through the gypsum wall board into the plaster flange (Figure 5).
1: Damper
2: Plaster flange
3: Gypsum board
4: Grille
5: RC channel
6: Steel plenum
7: Hanging strap, angle, or wire
8: Horizontal support stud or angle
8
Figure 3: Hanger Method: Grille Mount with Steel Plenum
Figure 4: Hanger Method: Grille Mount with Duct Board Plenum
1: Damper
2: Plaster flange
3: Gypsum board
4: Grille
5: RC channel
6: Duct board plenum
7: Hanging strap, angle, or wire
8: Horizontal support stud or angle
8
CRD-1WT & CRD-2WT 3

1/2 in.
minimum
3 in.
3 in.
1 in.
Figure 6 - Alternate Mounting Angle (provided by Others)
Figure 5: Hanger Method: Duct Mount with Steel Plenum
1: Damper
2: Plaster flange
3: Gypsum board
4: Duct
5: Duct retaining angle
6: RC channel
7: Steel plenum
8: Hanging strap, angle, or wire
9: Horizontal support stud or angle
9
Base Mount Method
The base mount method is the standard mounting method for CRD-2WT’s. It may also be used on CRD-1WT’s with
steel plenums that either have an insulation band or are duct mounted. An insulation band is used on units with steel
plenums that have a width or height greater than 12 inches [305 mm](see Figure 7A or 7B for reference).
1) The damper assembly is to be attached to the trusses using 2 -1 in. x 1 in. x 16 ga. or 2 -11⁄4in. x 1 in. x 20 ga. (25
mm x 25 mm x 1.5 mm or 32 mm x 25 mm x 1 mm) mounting angles. See Figure 6 for alternate mounting angle
detail. Attach each mounting angles to the damper with a minimum of 2 - #8 screws or 5⁄32 in. (8 mm) diameter
steel rivets.
Note: Make sure the fasteners do not interfere with the damper operation.
2) Install the damper assembly with attached mounting angles between the trusses as shown in Figures 7 & 8.
Attach mounting angles to the trusses using 4 - 11⁄4in. (32 mm) long steel screws per mounting angle.
For Grille Mount Installations
The grille/diffuser frame shall be steel. The grille/diffuser shall be attached with a minimum of 4 - 1 in. (25 mm) long
#6 screws run through the gypsum wall board into the plaster flange (Figures 7A and 7B).
For Duct Mount Installations
For duct mount installations a minimum 1 in. x 1 in. x 24 ga. (25 mm x 25 mm x 0.7 mm) retaining angle shall be
installed on all four sides and shall be attached with a minimum of 4 - 1 in. long #6 screws run through the gypsum
wall board into the plaster flange (Figures 8A and 8B).
CRD-1WT & CRD-2WT4

CRD-1WT Grille Mount, Steel Plenum
1. Damper
2. Mounting Angle
3. Plaster Flange
4. Gypsum Board
5. Grille
6. RC Channel
7. Steel Plenum
Figure 7A: Grille Mount of CRD-1WT with Steel Plenum
Figure 7B: Grille Mount of CRD-2WT
CRD-1WT Ducted Steel Plenum
1. Damper
2. Mounting Angle
3. Plaster Flange
4. Gypsum Board
5. Duct
6. Duct Retaining Angle
7. RC Channel
8. Steel Plenum
Figure 8A: Duct Mount of CRD-1WT with Steel Plenum
Figure 8B: Duct Mount of CRD-2WT
CRD-1WT & CRD-2WT 5

Figure 9
Damper with Insulation
Band and Steel Plenum
Assembly
* Note that not all dampers
with a steel plenum require
an insulation band.
Damper without Insulation
Band and Steel Plenum
Assembly
Insulation
Band
Plaster
Flange
Damper
Frame
Damper
Frame
3.5 in.
14 in.
maximum
14 in.
maximum
Field Installation of Steel Plenums for CRD-1WT
Fabrication of Fiberglass Ductboard Plenum for CRD-1WT
1) Fiberglass ductboard shall be a minimum of 1 inch (25 mm) thick UL 181 listed and have a minimum R-value 4.3.
2) The inside width x length dimensions on the duct board plenum shall be sized no greater than 1⁄8in. (3 mm) larger
than the damper frame. The maximum plenum height shall be 15 in. (381 mm) as illustrated below. The plenum
should be sized to provide a snug fit over the damper frame.
3) Edge and corner preparation shall be accordance with details shown (Figures 10 and 11). Plenum top shall be
fabricated and attached using similar method, S-AF and SF-AF (Figures 10 and 11).
4) Corner sealing tape shall be UL 181 listed and minimum of 2 inches (51 mm) wide.
5) The plenum duct collars shall be a minimum of 30 ga. (0.4 mm) galvanized steel. The total area of the plenum
box duct collars shall not exceed 113 sq. in. (2870 sq. mm) with a maximum of two duct collars per plenum. Duct
collars shall be securely fastened to the plenum duct board. Any segment of the duct collar that protrudes inside
the plenum must not interfere with the damper blade operation.
6) Plenum shall be attached to ceiling damper subframe using UL 181 listed tape (Figure 12).
7) Refer to Figure 4-7 for ceiling damper installation. The CRD-1WT ceiling is classified for use in specific wood
truss ceiling assemblies. See UL Fire Resistance Directory for floor/ceiling and roof/ceiling design numbers listed
on page 1.
1) The steel plenum box shall be a minimum of 28 ga. (0.47 mm) of galvanized steel.
2) The inside width x length dimensions of the steel plenum shall be sized no greater than 1⁄8in. (3 mm)larger than the
damper frame. The maximum plenum height shall be 14 in. (356 mm) as illustrated below. The plenum should be
sized to provide a snug fit over the damper frame.
3) The plenum duct collars shall be a minimum of 30 ga. (0.4 mm) galvanized steel. The total area of the plenum box
duct collars shall not exceed 78.5 sq. in.
(1994 sq. mm) with a maximum of two duct collars per plenum. Duct collars shall be securely fastened to the
plenum surface. Any segment of the duct collar that protrudes inside the plenum wall must not interfere with the
damper blade operation.
4) The steel plenum box is to be attached to the damper using a #8 screws, 1⁄8in. (3 mm) rivets, spot welds, or tack
welds. Minimum of two per side (Figure 9).
5) The attachment of the screws or rivets must not interfere with the damper operation.
CRD-1WT & CRD-2WT6

AF - Square Cut
with Flap
AF - Square Cut
S - Female Shiplap SF - Female Shiplap with
End Flap
VC - V-groove
Corner Fold
SC - Shiplap
Corner Fold
AF - Square Cut
with Flap
AF - Square Cut
S - Female Shiplap SF - Female Shiplap with
End Flap
VC - V-groove
Corner Fold
SC - Shiplap
Corner Fold
Figure 10- Cutting Duct board
S - AF
S - AF S - AF
S - AF S - AF S - AF
S - AF
S - AF S - AF
SC
SC SC SCSCSC
SC
1 Piece Duct 2 Piece “U” Duct 2 Piece “L” Duct 4 Piece Duct
Plenum Top
Figure 11: Assembly of ductboard plenum
Damper with Field Installed
Duct Board Plenum Assembly
Plaster
Flange
15 in.
maximum
Damper
Frame
Figure 12
CRD-1WT & CRD-2WT 7

474094 • CRD-1WT and CRD-2WT, Rev. 8, January 2022 Copyright 2022 © Greenheck Fan Corporation8
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the literature
section of the website at Greenheck.com/Resources/Library/Literature.
®
Phone: [phone] • Fax: [phone] • Parts : 800.355.5354 • E-mail: [email protected] • Website: www.greenheck.com
Our Commitment