Plenum Assembly continued, Plenum Installation

Plenum Assembly continued

Plenum and Curb to Structural Steel

An additional side (or access) panel may need to be removed in order to gain access to the inside of the plenum assembly. The bolts should be tightened in an even and consistent manner as to pull the two sections together and compress the gasketing.

After the plenum is assembled

Use all provided hardware to tighten and join the mating sections together. Any side panels removed to gain access to the interior of the plenum should be reattached. The assembled plenum has holes in the curb cap to fasten the plenum to the already installed roof curb.

The plenum is now ready to have gasketing placed in the mounting location between the plenum and the fan. After the gasketing has been attached the fans can be lifted and set into place.

Weatherhood with birdscreen (optional)

3⁄8 in. bolt (typical)

(by Greenheck)

Bolt or weld in field (by others)

5⁄16 in. bolt (typical)

(by Greenheck)

Bypass Air

Plenum

3⁄16 in. silicone gasket (by Greenheck)

Fiberglass

Insulation

Roof Curb

Structural Support (by others)

Modular Plenum

Isometric View

Lifting Lugs

Drain hole

1 in. coupling

Bolted and gasketed access panels

Plenum Installation

The figures depicted illustrate three common methods used to install Vektor-CD bypass plenums. Methods used to attach a Vektor unit are dependent on local codes, roof construction design and roof construction

Plenum (no Curb) to Channel Base

5⁄16 in. bolt (typical)

(by Greenheck)

	Weatherhood	Bypass Air
	with birdscreen
		Plenum
	(optional)

3⁄16 in. silicone gasket (by Greenheck)

Field drilled & bolted (by others)

Structural Support (by others)

Fan, Plenum, and Curb to Roof Deck

materials. Consult an architect or structural engineer for proper means of attachment.

Place 1/2 inch thick x 1/2 inch wide silicone gasket around the perimeter of top edge of curb, adhesive side down (gasket provided in Vektor-CD hardware kit).

To align holes properly, the plenum needs to be centered on the curb.

When holes are provided in the curb, install 316 stainless steel screws (provided) in all holes. Use anti- seize gel (provided) to prevent galling / welding of all stainless steel fasteners.

When holes are not provided in the curb (non Greenheck curb): Drill 0.28 in. diameter holes in curb using bypass air plenum holes as a template. Install 5/16 in. self-tapping screws (provided) in all the holes.

5⁄16 in. self-tapping screws (by Greenheck)