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as shown on Figure 40.
4. At each floor level above the Tee, install
the Firestop Spacer (E) as shown in Figure
40.
NOTE: Provide at least a 1-inch clearance
around the Tee branch where it passes
through combustible wall.
Type B-W Gas Vent - 4" Oval
Model BVO Oval Gas Vent may be installed
within a standard 2x4 stud wall if all the
following conditions are met.
1. Arrows on parts should always point up.
2. Stud bay must be a 16-inch, on-center
stud bay.
3. 2x4 studs must be a minimum of 3.5
inches deep.
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 41 and 42.
Installation of Type B-W Gas Vent
1 . C u t o u t t h e c e i l i n g p l a t e a t t h e
floor level above the heater flush with
s t u d s i n s p a c e w h e r e Ve n t i s t o
be installed.
2. Nail one Plate Spacer (40PS), (A), across
cut-out area in ceiling plate. See Figure 41.
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 pipe as shown in Figure 41.
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 Plate Spacer across cutout
ceiling plate as shown in Figure 41. 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 42.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
6. After passing through the last Firestop
Spacer, the Vent may be finished with either
round or oval fittings, flashings and Cap.
(Round pipe, fittings, flashings, and vent caps
cost less than corresponding oval parts.)
Type B-W
Installation
Multi-Story Type B-W
Installations
B
Fig. 41
AT SECOND AND
SUBSEQUENT
CEILING LEVELS,
USE 4OFS
FIRESTOP
SPACERS
AT FIRST CEILING
LEVEL, USE 4OPS
CEILING
PLATE
SPACERS
Fig. 42
A
27
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