Goodman GMP Installation & Operating Instructions Manual page 31

13. A Category I appliance must never be con-
nected to a chimney servicing a solid fuel
appliance. If fireplace chimney flue is used
to vent this appliance, the fireplace open-
ing must be permanently sealed.
14. A vent connector shall be supported without
any dips or sags and shall slope a mini-
mum of 1/4" per linear foot of connector,
back towards the appliance.
15. Vent connector shall be firmly attached to
draft hood outlets or flue collars by sheet
metal screws or other approved means,
except vent connectors of type B vent ma-
terial that shall be assembled according to
the manufacturer's instructions. Joints be-
tween sections of single wall connector
pipes shall be fastened by sheet metal
screws or other approved means.
16. When the vent connector used for Category I
appliances must be located in or pass
through a crawl space or other area which
may be cold, that portion of the vent con-
nector shall be of listed double wall type B
vent material or material having equivalent in-
sulation qualities.
17. The entire length of single wall metal vent
connector shall be readily accessible for
inspection, cleaning or replacement.
18. For appliances with more than one input rate,
the minimum vent or connector (Fan - Min)
capacity determined from the tables shall be
less than the lowest input rating and the
maximum vent or connector (Fan or Nat
Max) capacity determined from the tables
shall be greater than the highest appli-
ance input rating.
19. For single appliance vents:
a) If the vertical vent or tile lined chimney
has a larger diameter or flow area than
the vent connector, use the vertical vent
diameter to determine the minimum vent
capacity and vent connector diameter to
determine the maximum vent capacity.
The flow area of the vertical, however,
shall not exceed 7 times the flow area
IO137
of the listed appliance categorized vent
area, draft hood outlet area or flue collar
area unless designed according to ap-
proved engineering methods. See table 9
for calculated areas.
For multiple appliance vents:
b) The flow area of the largest section of a
vertical vent or chimney shall not exceed
7 times the smallest listed appliance
categorized vent area, flue area, or draft
hood outlet area unless designed accord-
ing to approved engineering methods.
See table for calculated areas.
Maximum vent or tile lined chimney flow area
*Draft hood outlet diameter, flue collar diame-
ter or listed appliance categorized vent di-
ameter.
c) In no case, shall the vent connector be
upsized more than 2 consecutive table
size diameters over the size of the draft
hood outlet, flue collar or listed catego-
rized vent. Example: An appliance with a
4 inch diameter flue outlet collar or draft
hood connector cannot be vented with a
connector larger than 6 inches.
20. Masonry chimneys used to vent Category
I central furnaces must either be tile lined
or lined with a listed metal lining system or
dedicated gas vent. Unlined chimneys are
prohibited. (See note 1)
21. A fan assisted furnace may be common
vented into an existing chimney provided;
a) The chimney is currently serving at least
one draft hood appliance.
SINGLE APPLIANCE VENTING OF A
FAN ASSISTED FURNACE INTO A TILE
LINED, MASONRY
PROHIBITED.
FIRST BE LINED WITH EITHER TYPE B
VENT SIZED IN ACCORDANCE WITH
TABLES 1 OR 2 OR A LISTED SINGLE
WALL, METAL LINING SYSTEM, SIZED
IN ACCORDANCE WITH NOTE 22.
31
2
= TT(D*) X 7
4
CHIMNEY
THE CHIMNEY
IS
MUST