Section 3 (Model Bvo Oval - 4", 5", 6"); 6-Inch Oval Installation In 2X4 Inch Stud Walls - DuraVent BV Installation Instructions Manual

SECTION 3
MODEL BVO - OVAL GAS VENTS -
4" - 5" - 6"
Basic Vent Structure
Model BVO Oval Gas Vent is available in
sizes 4, 5, and 6- inch and is listed to UL441.
The individual sizes reflect the flow rate
capacities equivalent to 4-inch, 5-inch, and
6-inch Round Type B Gas Vent. The joint of
the Model BVO Type B Oval Gas Vent takes
up one inch when assembled. Model BVO
Oval Gas Vent is UL-listed for the following
applications and clearances to combustibles
as shown in the Table below. NOTE: Model
BVO Oval is not approved in Canada.
Underwriters Laboratories-listed
Minimum Clearances to Combustibles
Oval Description
U.S.A. Only
Model BVO (UL441)
4", 5" and 6"
4" and 5"
(when installed in
2x4
stud wall with other-
than-recessed
heater)
4"
(when installed in
2x4 stud wall with
recessed heater)
Model BVO Oval Type B Gas Vent is available
in sizes 4, 5, and 6-inch, and requires a 1-inch
clearance to combustibles. This includes all
Vent Sections, Elbows, Tees, and Adapters.
When used as Type B Gas Vent, Model BVO
Oval Gas Vent must follow all of the same
requirements as round Type B Gas Vent,
such as the necessity of using firestops at
each floor level. See Section 1.
26
Minimum
Type
Clearance
B 1"
Clearances as
B 2x4
determined by
use of 4OFS or
5OFS
firestop spacers
at each ceiling
level
B-W Clearances as
determined by
use of 4OHD
ceiling plate
spacers, and
4OFS firestop
spacers
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Type B 2 x 4 Gas Vent - 4" or 5" Oval
Four- and five-inch 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 Section. This includes any
type of insulation.
5. The Firestop Spacer (FS) must be installed
at each floor level. See Figure 40.
NOTE: Only the straight Vent Pipe Sections,
with or without the Oval Tee, may be used
inside the stud bay with reduced clearances
to combustibles. See Figure 40.
Type B 2x4
Installation
D
C
B
Installation of Type B 2 x 4 Gas Vent
1. Cut out the ceiling plate in the space where
the Vent is to be installed.
2. Nail a 2x4 support (A) at the desired height
between the studs. See Figure 40.
3. Attach the Tee Support (B), the Tee (C)
with the Oval Tee Cap, and the Vent Pipe (D)
E
A
Fig. 40