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A single-wall vent pipe used as a vent connector in resi-
dential or commercial applications, or as a vertical vent in
commercial applications, must have all seams and joints
sealed with pressure-sensitive aluminum tape or silicone
rubber sealant. The aluminum tape must have a
temperature rating of 400°F (204°C) i.e., 3M 433 or
equivalent. Silicone rubber sealant must have a
temperature rating of 482°F (250°C), i.e., Dow Corning
RTV-736 or equivalent. All joints must be secured with at
least two corrosion-resistant screws. All joints must be
checked for gas tightness after installation. Single-wall
vent pipe used as vertical vent in commercial
applications must not pass through any attic, interior wall,
concealed space, or floor.
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These compact unit heaters are listed as Category 1
appliances for vertical vent installations.
1 - These unit heaters are to be used with NFPA- or
ANSI-approved chimneys or U.L.-listed type B-1
gas vents, or listed chimney lining systems for gas
venting where applicable, as well as the modifications
and limitations listed in figure 3. Seal single-wall vent
material according to
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section.
2 - The vent connector shall be 4” (102mm) diameter
on 30 , 45 , 60 , 75 , 090, 105 , 125 , and 150
Btuh
units; 5” (127mm) diameter on 175 , 200 , 250 ,
& 300 Btuh units; 6” (152mm) on 360 & 400 Btuh
units. On 175-400 units, a flue transition piece
(supplied) is required to fit over the outlet of the
induced draft assembly on the appliance.
127(
If needed, loosen the upper right two or three
screws securing the combustion air blower. Slide the tran-
sition into place and secure loosened screws.
3 - eep the vent connector runs as short as possible
with a minimum number of elbows. Refer to the
current edition of ANSI Z223.1 or CSA-B149
installation compliance codes for maximum vent and
vent connector lengths.
4 - The entire length of a single-wall metal vent connector
shall be readily accessible for inspection, cleaning
and replacement.
5 - Single-wall vent pipe used as vertical vent in
commercial applications must not pass through any
attic, interior wall, concealed space, or floor.
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0$;,080+25,=217$/9(17&211(&725$1'
+25,=217$/9(173,3(/(1*7+6
No. of
Elbows
30, 45, 60, 75, 90, 105, 125,
150, 175, 200, 350, 400
250 & 300
ft
m
ft
m
1
25
7.6
35
10.7
2
20
6.1
30
9.1
3
15
4.6
25
7.6
4
10
3.0
20
6.1
5
5
1.5
15
4.6
6
-
-
10
3.0
7
-
-
5
1.5