Spec Sheet

Type B Gas Vent® is a registered product of M&G Duravent, Inc. All rights Reserved. Made in the USA. 800-835-4429 www.duravent.com L936 6/2011
DuraVent Type B Gas Vent - Specifications
Item Clearances
Maximum
Height
Outer Tube Ø Materials
Locking
Device
UL
Listing
ULC
Listing
Type B Vent
Round 3"-8"
1 inch to combustibles 100 feet ⁄" larger than ID
Inner - .012" Aluminum
Outer - .018" Galvanized
DuraLock MH6357 CMH1276
Round 10" to 16"
See notes 2 & 5
1 inch to combustibles 100 feet 1" larger than ID
Inner - .016" Aluminum
Outer - .021" Galvanized
DuraLock MH6357 CMH1276
Round 18" to 30"
1 inch to combustibles 100 feet
2" larger than ID
See note 5
Inner - .020" Aluminum
Outer - .021" Galvanized
Screws MH6357 CMH1276
Oval Type B Vent
4" and 5"
2" x 4" & 2" x 6" stud wall and
1 inch to combustibles
See Note 3
2 ⁄" x 7 ⁄"
3 ⁄" x 10 ⁄"
Inner - .012" Aluminum
Outer - .018" Galvanized
Button Lock MH6357 CMH1276
Oval Type B Vent
6"
2" x 6" stud wall and 1 inch
to combustibles
See Note 3 3 ⁄" x 12"
Inner - .012" Aluminum
Outer - .018" Galvanized
Button Lock MH6357 CMH1276
Type B Vent 3" to 6"
Round Liner
0"/Masonry 50 feet ⁄" larger than ID
Inner - .012" Aluminum
Outer - .018" Galvanized
DuraLock
MH14420
MH6357
CMH1407
DuraFlex AL Gas
Relining 3" to 6"
0"/Masonry 50 feet ⁄" larger than ID .010" Aluminum Flex
Screws
DuraLock
MH14420 --
DuraConnect
3" to 6"
1 inch to combustibles See Note 4 ⁄" larger than ID
.010" Aluminum Flex
.018" Galvalume
DuraLock MH14089 --
DuraConnect II
3" to 6"
1 inch to combustibles See Note 4 ⁄" larger than ID
.010" Aluminum Flex
.018" Galvalume
DuraLock MH14089 --
NOTES
1. Clearance to combustibles is
the air space between vent and
combustibles.
2. Maximum height varies with
equipment over 50’, for taller
applications refer to SDV sizing
handbook 2. (L202). 14"-16"
Require screws.
3. When oval is used on wall
furnaces, minimum height required
from bottom of furnce to cap is 12’,
minimum 16” stud space.
4. Limited by sizing tables.
5. 18” pipe OD is one inch larger
than ID and 20” - 30” OD is 2”
greater than ID.