Submittal

17
ENCLOSURE REQUIREMENTS
Through Rooms: Interior vents shall be enclosed where they
extend through closets, storage areas, occupied spaces, or
anyplace 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."
FIRESTOPS (Fig. 8)
1. Firestops are required at each ceiling/floor penetration
including an attic. Firestops are not required at the
roof deck penetration.
2. Cut and/or frame hole. (Table 3)
3. Slide the two halves together and attach to the ceiling.
Figure 8
FIRESTOP
FIRESTOP
ENCLOSURE
FIRESTOP
Table 3 - Wall & Ceiling Penetration Sizing Table
VENT DIAMETER
Termination 2" 3" 4" 5" 6" 8"
CONCENTRIC VERTICAL OR HORIZONTAL 4 ⁄" / 105mm 5 ⁄" / 130mm 6 ⁄" / 155mm N/A N/A N/A
TWIN PIPE HORIZONTAL CLASS IIB
7 ⁄" x 2⁄"
187mm x 65mm
8 ⁄" x 3⁄"
212 x 85mm
9" x 4⁄"
228 x 100mm
N/A N/A N/A
TWIN PIPE HORIZONTAL
CLASS IIC (Framing Dimensions)
8" x 3"
200 x 77mm
8 ⁄" x 3⁄"
225 x 98mm
9 ⁄" x 4 ⁄"
238 x 112mm
N/A N/A N/A
SINGLE HORIZONTAL
CLASS IIB 2⁄" / 65mm 3 ⁄" / 85mm 4" / 100mm N/A N/A N/A
SINGLE HORIZONTAL
CLASS IIC (Framing Dimensions)
3"
77mm
3 ⁄”
98mm
4 ⁄”
112mm
N/A N/A N/A
SINGLE WALL W/ Locking Clamp VERTICAL 3 ⁄" 4 ⁄" 5 ⁄" 6 ⁄" 7 ⁄" 9 ⁄"
SINGLE PIPE NO Locking ClampS VERTICAL 3" 3 ⁄" 4 ⁄" 5 ⁄" 6 ⁄" 8 ⁄"