Installation Instructions

ManualsBrandsAmerivent ManualsB-Vent4" 45° Flat Elbow Class B Vent

AmeriVent Round and Oval Gas Vent

4. There must be nothing else in the stud bay other than

the Vent and furnace. This includes any type of

insulation.

5. The installation must contain an Oval Hold-Down Plate

(4OHD) at the base, Oval Plate Spacers (4OPS) at the

first ceiling level, and Firestop Spacers (4OPS) at any

additional floor levels. See Figures 18 and 19.

Installation of Type B-W Gas Vent

1. Cut out the ceiling plate at the floor level above the

heater flush with studs in space where Vent is to

be installed.

2. Nail one AmeriVent Plate Spacer (40PS), (A), across

cut-out area in ceiling plate. See Figure 18. Plate

Spacer (4OPS) is required at the first ceiling level

above a wall furnace to center and space vent properly

and to provide the required opening between floors.

3. Snap Hold-Down Plate (4OHD), (B), onto bottom end

of AmeriVent pipe as shown in Figure 18. Install Vent

Section in position. Use two No. 8 binder head sheet

metal screws to attach Hold-Down Plate firmly to

Furnace header plate through pre-punched holes.

4. Nail second AmeriVent Plate Spacer across cutout

ceiling plate as shown in Figure 18. Firestop Spacers

(OFS) must be used at subsequent levels.

5. If the Vent is to continue additional stories within a 2x4

stud space, install Firestop Spacers at the second and

subsequent ceiling levels as shown in Figure 19.

6. After passing through the last Firestop Spacer, the

Vent may be finished with either round or oval

AmeriVent fittings, flashings and AmeriVent Cap.

(Round pipe, fittings, flashings, and vent caps cost less

than corresponding oval parts.)

Attic Insulation Shield

In some areas, the building code requires the use of an

attic insulation shield (AVS) on single-story Type B-W

installations.

Termination of Vent Structure

The AmeriVent Gas Vent is available for most models and

sizes in two styles of Termination Tops--AmeriVent Cap and

Universal Cap. The AmeriVent Cap is a lock-neck design

with the same lock as the female end of the Vent sections.

The Universal Cap is designed to fit inside the inner wall of

the vent sections.

American Metal Products 12" and smaller Gas Venting

Systems, using either the AmeriVent Cap or the Universal

Cap, may terminate in accordance with Table 7 and

Figures 20 and 21.

Type B-W

Installation

Figure 18

Multi-Story Type B-W Installations

AT SECOND AND

SUBSEQUENT CEILING

LEVELS, USE 40FS

FIRESTOP SPACERS.

AT FIRST CEILING LEVEL,

USE 40PS CEILING

PLATE SPACERS.

Figure 19