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ENCLOSURE REQUIREMENTS
Through Rooms: Interior vents shall be
enclosed where they extend through closets,
storage areas, occupied spaces, or any place
where the surface of the vent could be
contacted by persons or combustible materials
except when installed in the room with the
appliance.
Multi-Story: Consult local building or other
applicable codes for requirements in your
area. In the U.S., NFPA 211 10.6.3 (2013)
states: "Vents that pass through the floors
of buildings requiring the protection of
vertical openings shall be enclosed within an
approved enclosure. The enclosure walls shall
have a fire resistance rating of not less than
1 hour where a vent is located in a building
less than four stories in height. The enclosure
walls shall have a fire resistance rating of not
less than 2 hours where a vent is located in a
building four or more stories in height. "
Termination
CONCENTRIC
VERTICAL OR HORIZONTAL
TWIN PIPE HORIZONTAL
CLASS IIB
TWIN PIPE HORIZONTAL
CLASS IIC (Framing Dimensions)
SINGLE HORIZONTAL
CLASS IIB
SINGLE HORIZONTAL
CLASS IIC (Framing Dimensions)
SINGLE WALL W/ LOCKING BAND
VERTICAL
SINGLE PIPE NO LOCKING BANDS
VERTICAL
6
Table 3 - Wall & Ceiling Penetration Sizing Table
2"
3"
4 1⁄8"
5 1⁄8"
105mm
130mm
7 3⁄8" x 25⁄8"
8 3⁄8" x 37⁄8"
187mm x
212 x 85mm
65mm
8" x 3"
8 7⁄8" x 37⁄8"
200 x 77mm
225 x 98mm
25⁄8"
3 3⁄8" "
65mm /
85mm
3"
3 7⁄8
77mm
98mm
3 1⁄2"
4 1⁄ 4 "
3"
3 3⁄ 4 "
FIRESTOPS
1.
Firestops are required at each ceiling/
floor penetration including an attic.
Firestops are not required at the roof
deck penetration.
Cut and/or frame hole. (Table 3)
2.
3.
Slide the two halves together and attach
to the ceiling using either 8 penny nails
or #8 1-1/2in wood screws at each of the
four corners and at the two overlapping
sides (Fig.2)
VENT DIAMETER
4"
5"
6 1⁄8"
N/A
155mm
9" x 43⁄8"
N/A
228 x 100mm
9 3⁄8" x 4 3⁄8"
N/A
238 x 112mm
4" "
N/A
100mm
4 3⁄8
N/A
112mm
5 1⁄8"
6 1⁄2"
4 1⁄2"
5 3⁄ 4 "
Figure 2
6"
N/A
N/A
N/A
N/A
N/A
7 1⁄ 4 "
6 3⁄ 4 "
8"
N/A
N/A
N/A
N/A
N/A
9 1⁄ 4 "
8 3⁄ 4 "
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