Greenheck Fan OFD-XXX Series, OFSD-XXX Series Damper Is Installed Outside Of Wall Plane, Ofsd-Xxx

1. DAMPER IS INSTALLED OUTSIDE OF WALL PLANE

OFSD-XXX

Figure 1 shows two approved installations for

combination fire smoke dampers: 1) “Through the

grille access” and 2) installation in continuing duct.

To provide "through the grille" access to the damper

actuator, the damper is located toward the back of the

sleeve and the actuator is installed between the damper

and grille. Actuator and damper can be accessed and

serviced by removing the grille. To provide access to the

damper actuator for continuing ductwork, refer to the

requirements of NFPA 90A.

ODFD-XXX, OFD-XXX, and OSSFD-XXX: Figure

1 shows two installations that are also approved for

curtain fire dampers. For access to inspect the damper

and fusible link, refer to the requirements of NFPA 90A.

2. CLEARANCE REQUIREMENTS

There is no minimum clearance requirement between

the wall/floor opening and the sleeve exterior (with

thermal blanket attached). However, to facilitate

installation, clearances between the wall/floor opening

and the damper sleeve are recommended. although

there is no maximum allowable clearance, the minimum

overlap requirements between the wall/floor and the

flange/retaining angle must be met. On grill mount

installations the flange must overlap the wall/floor by

1⁄2 in. (13mm). On continuous duct installations, the

retaining angles must overlap the wall/floor by 1 in.

(25mm). Because no clearances are required betweeen

the wall/floor opening and the sleeve, dampers may not

be installed in the plane of the wall using this installation

method.

3. DUCT TO SLEEVE CONNECTIONS

Steel stud

			#10 sheet metal screws
			spaced 6 in. on center and
	5/8 in . x 1 in. 16 ga.		maximum of 2 in. from the
			corners (minimum of 2
	angles minimum
			screws per side). Screw into
	(Refer to Section 4)
			rear portion of the studs so
			as to avoid space conflicts
			with the grille assembly.
		Factory Supplied
		Thermal Blanket
			Factory Supplied
Grille			Thermal Blanket
(Supplied
by others)

	Fire damper or	Fire damper or
7 1/2 in.	combination fire
		combination fire
	smoke damper
Max.		smoke damper

“Duct Terminates” Metal Stud

Note: Both installations may be vertical or horizontal.

Gypsum Wallboard

Dampers are supplied with actuators (on applicable

models) and sleeves from the factory and can be

installed without the need for additional field installed

sleeves.

Sleeve gauges of 20-14 (.9mm - 2mm) are to be used.

UL Standard 555 requires all ducts to terminate at fire

damper sleeves. Sleeve thickness must not be less than

the gauge of the connecting duct.

Duct to sleeve breakaway connections must be of the

type described on page 5. Factory furnished round duct

collars on type R and CR dampers are also considered

to be breakaway connections and may be used.

Wooden Stud Construction

Stud or Runner

In wood stud construction, gypsum wallboard must cover all wood stud surfaces.

1in. x 1 in. 16 ga. angle minimum (Refer to section 4)

Factory Supplied Thermal Blanket

	Grille
Factory Supplied	(Supplied
	by others)
Thermal Blanket

7 1/2 in.

Max.

6 1/2 in.	Fire damper or
	combination fire
Max.
	smoke damper

“Duct Terminates” Wood Stud

re	Fire damper or
	combination fire
r
	smoke damper

“Duct Continues”

Figure 1: Installation configurations for ‘Out of Wall’ curtain fire dampers and combination fire smoke dampers. 3