Rheem 97MDV060 Series Installation Instructions Manual page 28

GENERAL VENTING REQUIREMENTS AND
GUIDELINES
TERMINATION REQUIREMENTS
THE COMBUSTION PRODUCTS AND MOISTURE
IN THE FLUE GASES WILL CONDENSE AS THEY
LEAVE THE TERMINATION. THE CONDENSATE
CAN FREEZE ON THE EXTERIOR WALL, UNDER
THE EAVES AND ON SURROUNDING OBJECTS.
SOME DISCOLORATION TO THE EXTERIOR OF
THE BUILDING IS TO BE EXPECTED. HOWEVER,
IMPROPER LOCATION OR INSTALLATION CAN
RESULT IN FINISH DAMAGE TO THE BUILDING
AND MAY RE-CIRCULATE THE PRODUCTS OF
COMBUSTION INTO THE COMBUSTION AIR TER-
MINAL AND FREEZE.
Vent terminations for both Non-Direct and Direct-Vent in-
est edition of ANSI Z21.47 Gas-Fired Central Furnaces.
stallations must adhere to guidelines specified by the lat-
These are clearly detailed in Figure 26 for Direct-Vent in-
stallations. In addition to these requirements, the installa-
tion and venting must also comply with the National Fuel
Gas Code (U.S.) and CSA-B149.1; Canadian Natural Gas
and Propane Installation Code (Canada) and the following
NOTE: Screens of any kind on the inlet or exhaust pipes
requirements must also be met:
are not permitted and will void the manufacturer's war-
In addition to the requirements shown in Figure 26 for Di-
ranty.
rect-Venting, the vent must be installed with the following
minimum clearances:
1. The vent terminal shall have a minimum horizontal
clearance of 4 feet from electric meters, gas meters,
regulators and relief equipment.
2. Locate the furnace combustion air inlet a minimum of 3
feet from the vent of any other gas or fuel-burning ap-
28
pliance or clothes dryer to prevent recirculation of the
flue gases into the furnace combustion air inlet. The
only exception to this requirement is the case of multi-
venting two or more furnaces, which is covered in the
section on multiventing of these instructions.
Figure 26 (Direct-Vent), the vent location should also be
In addition to the minimum clearances listed above and in
governed by the following guidelines.
1. Avoid terminating under any kind of patio or deck. How-
ever, if necessary, vent piping may be installed under a
deck as long as the termination(s) is (are) not under the
deck.
2. If installing the vent under a deck, insulate it to insure
that no condensate freezes and blocks the pipes.
3. Do not terminate in any area or behind any obstruction
that may allow the flue products to become stagnant
and/or re-circulate.
4. Do not locate on the side of a building with prevailing
winter winds. This will help prevent moisture from
freezing on the walls and overhangs (under eaves).
5. If extending vent through a brick or masonry surface, a
sleeve between the wall and venting is suggested to
protect against damage from thermal expansion and
contraction.
6. A corrosion-resistant sheet metal or plastic backing
plate installed on the wall behind the vent is suggested
to prevent exhaust gases and condensate from con-
tacting the wall.
7. Avoid locating too close to shrubs as condensate may
stunt growth or kill them.