Connecting Vent Cap with Horizontal Vent Pipe

Venting Installation

Instructions

Continued

Combustible Exterior Wall: For vinyl siding, stucco, or wood exteriors, a siding standoff must be installed between the vent cap and exterior wall. The siding standoff prevents excessive heat from damaging siding materials. Siding materials must be cut to accommodate standoff. Bolt the vent cap to the standoff. Apply non-hardening mastic around outside edge of the standoff. Position the standoff/cap assembly in the center of the square hole and attach to exterior wall with wood screws pro- vided (see Figure 20). The siding standoff must sit flush against the exterior fascia material.

5.Combustible Exterior Wall Only: Slide interior wall firestop over vent pipe before connecting horizontal run to vent cap (see Figure 21).

6.Make final connection to vent terminal.

Flush or recessed with short vent system:

Vent system may be pre-sized. Check for final fit and slide unit into framing with firestop in place. This is helpful when using rigid pipe and round vent termination. Vent may be preconnected and slipped through firestop.

Make sure the 45° connection at unit is tight and does not come loose before unit is nailed to framing.

Square vent or long vent configuration: Vent pipe must be manipulated at outer end to make final connection. Manually secure pipe inside open framing. If this is a retrofit installation in an inaccessible space, you may have to secure the outer end of vent pipe with wall straps and tap screws at outer end.

When using tap screws with rigid pipe, be sure that screws do not penetrate inner pipe. These procedures may also be followed by flexible pipe installations. To use flexible pipe, vent must be drawn through end firestop, cut back to 6"-8" to permit easy connection of flex termination and connection must be slipped back into and secured to installation. You must use an adequate number of spring spac- ers at ends and closest bend to termination to prevent kinks or collapsing on the fire. Do not use screws with flex pipe. Vent system must be code inspected and released before adding dry wall or other surface treatments.

Cut Vinyl Siding

Away to Fit Standoff

Standoff

Wood Vent

Screw Cap

Bolt

Apply Mastic

to All Four Sides

Figure 20 - Installing Vinyl Siding Standoff (Combustible Exterior Wall)

Interior Wall Surface

Interior Wall Firestop (Combustible Exterior Wall Only)

Horizontal

Vent Pipe

Screw

Vent Cap

(Horizontal Termination)

Figure 21 - Connecting Vent Cap with

Horizontal Vent Pipe

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