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CLEARANCES TO COMBUSTIBLES
Table 1 shows the required MINIMUM AIRSPACE CLEARANCE TO COMBUS -
TIBLES. "Combustibles" include framing lumber, drywall, plywood, paneling,
insulation, wiring and other building materials.
Minimum Clearance to Combustibles Single Wall DS
Rated
Max.
Diameter
operating
operating
temperature
temperature
480º F
550º F
3" to 12"
(250º C)
(288º C)
480º F
550º F
14" to 24"
(250º C)
(288º C)
Minimum Clearance to Combustibles Double Wall DSD / DSID
Rated
Max.
Diameter
operating
operating
temperature
temperature
480º F
550º F
3" to 12"
(250º C)
(288º C)
480º F
550º F
14" to 24"
(250º C)
(288º C)
3" to 12"
480º F
550º F
L-VENT
(250º C)
(288º C)
14" to
480º F
550º F
24"
(250º C)
(288º C)
L-VENT
Table 1 - Minimum Clearances for DuraSeal
Auxiliary parts such as combination Roof Supports, Roof Thimble, Flashings
and Wall Thimble outer shields are intended to be attached directly to the
framing or to ceilings, floors, or walls in accordance with their respective
instructions. These parts, which are installed in contact with wood or other
combustibles, are designed and tested to assure that they do not overheat
at points of contact.
Notes:
1. Unenclosed requires at least two sides open.
2. Single Wall (DS) may be enclosed only in non-combustible enclosure.
3. Reduced clearances may be attained by using non-combustible enclosures.
4. Combustible Material is any material made of or surfaced with wood,
compressed paper, plant fibers or other materials that are capable of being
ignited or burned. Such material shall be considered combustible even
though it is flame-proofed, fire-retardant treated, or plastered. (Source:
NFPA 54/ANSI Z223.1)
5. Design any enclosure to permit inspection of the system.
6. Do not place insulation in any required clearance spaces surrounding the
vent system unless these instructions suggest otherwise and the insulation
is specified or supplied.
7. When using Viton caulking, follow the manufactures required drying times.
Material Thickness
*all seams are laser welded
DuraSeal DS
Diameter
Flue
Diameter
AL29-4C - .015"
3" to 9"
3" to 9"
316L - .015"
AL29-4C - .020"
10" to 16"
10" to 16"
316L - .019"
AL29-4C - .024"
18" to 24"
18" to 24"
316L - .024"
Enclosed
Unenclosed
(4 sides)
(2 sides Max.)
Horiz.
Vert.
Horiz.
Vert.
N/A
N/A
2"
2"
N/A
N/A
4"
4"
Enclosed
Unenclosed
(4 sides)
(2 sides Max.)
Horiz.
Vert.
Horiz.
Vert.
N/A
1"
1"
1"
N/A
1"
3"
1"
N/A
2"
2"
2"
N/A
2"
3"
2"
®
DuraSeal DSD / DSID
Flue
Casing
AL29-4C - .015"
441 stainless - .015"
316L - .015"
AL29-4C - .020"
441 stainless - .020"
316L - .019"
AL29-4C - .024"
441 stainless - .024"
316L - .024"
GENERAL INSTALLATION REQUIREMENTS
When venting Category I, II, III, or IV appliances or TYPE L vented appliance,
DuraSeal must be used for the entire length of the system. Do not mix pipe,
fittings, or joining methods from different manufacturers. See the DuraSeal
catalog for a complete list of parts and products. Every vent system
must be planned and installed for optimum performance and safety. The
venting system must be free to expand and contract and must be supported
in accordance with these instructions. (Check for unrestricted vent movement
through walls, ceilings, and roof penetrations). Refer to the gas appliance
manufacturer's instructions to determine venting requirements and limitations
with respect to installation and use of the appliance. It is the responsibility
of the installer to contact local building and fire officials concerning
any installation restrictions and/or inspection requirements that may
apply. Permits may be required before starting an installation.
•
If required by the appliance manufacturer, a Drain Tee Cap must be
located as close as possible to the appliance flue outlet. Depending on
the arrangement of the vent, more than one drain may be required.
Unless a Drain Tee Cap is supplied with the appliance, install a DuraSeal
Drain Tee Cap.
•
More than one Category II, III or IV appliance may not be connected into
the same vent system, unless the appliance manufacturer specifically
approved such a system and the appliance are designed for multiple
venting. Cat. II, III or IV appliances MAY NOT be common vented with Cat.
I, natural draft appliances. This limitation can be removed if an engineering
analysis demonstrates normal and safe operation of appliances.
•
DuraSeal must not come in contact with plumbing or electrical systems.
•
Maintain rated clearances to combustibles over the entire length of the
vent system.
•
DuraSeal shall not be routed into, through, or within any vent, such as an
existing masonry or factory-built chimney, that is connected to another
appliance.
PART NUMBERS
These instructions identify major model DS-DSD-DSID parts by name and part number.
Material Code Designations
B
Type 316 Stainless Steel
H
Type 430 Stainless Steel
K
Type 441 Stainless Steel
P
Type 439 Stainless Steel
U
Type AL29-4C Stainless Steel
Example:
DSD 36" length
with inside diameter 14" made of AL29-4C inner flue and
.
SS441 outer casting
DSD
14
L36
Model
Dia.
Part
DS 30° elbow
with inside diameter 22" made of 316L.
DS
22
E30
Model
Dia.
Part
DSD wall support
for 8" diameter chimney made of stainless 439.
DSD
8
WSHD
Model
Dia.
Part
UK
Material
B
Material
P
3
Material
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