Greenheck Fan GGH20 manual Ductwork, Installing External Supply Plenums, Exhaust

Supply Plenum Clip

Ductwork

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 external weld. If you have an Automatic Fire Damper please refer to that manual for installation instructions now.

Supply

Supply ductwork (where applicable) should be connected to the hood in a manner approved by the local code authorities.

For proper installation of duct collars when they are shipped unattached see Installing Duct Collars on page 10.

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).

Installing External Supply Plenums

	Option #2
	Uni-Strut supplied by others
	TOP VIEW
	HOOD
	Option #1
	For plenums < than or = 96 inches
	Two (2) clips are needed.
UTILITY	For plenums > than 96 inches
	Three (3) clips are needed.
CABINET	The third clip is located in the
	center of the plenum length.
	Option #1
	Attach hanging clip to hood
	standing seam with the
	supplied ‘C’ clamps.
	Optional: Drill and bolt a
	1/4-20 SS bolt through the
	clip and hood standing seam
11.5
	TOP VIEW
23.5	SUPPLY PLENUM
	Hanger Bracket

Option #1

Hanging clip could be 23.5 inches from end if there is a utility cabinet on the end of the hood.

Using the Supply Plenum Clip - Option #1

1.Bolt the hanging clip to the supply plenum. Two clips are needed for plenums less than 96 in. (243.84 cm) long and three for plenums greater than 96 in. (243.84 cm). The

third clip is located in the center of the plenum length. If there is a utility cabinet, the hanging clip should be

23.5 in. (59.69 cm) from the end to the hood.

2.Using the c-clamps provided, clamp the supply plenum hanging clip to the hood standing seam. Option: Drill and bolt a 1/4-20 SS bolt through the clip and hood standing seam.

Option #1 : Hanging Clip

‘C’ Clamp Hood Standing Seam

Hanging Clip bolted to plenum shell

Hanging Clip

HOOD FRONT SUPPLY PLENUM SHELL

NOTE

The supply plenum is provided with plenum clips that assist in hanging the plenum. The plenum should not be hung only with the plenum clips; threaded rod or uni-strut must also be used.

®

Model GGH2O 9