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Marvair GAA A/C w/Gas Heat I&O Manual
06/2023 Rev.5
4.17 Venting of the Furnace
The wall mounted air conditioner with gas heat furnace is a Category I furnace, i.e., a central furnace
which operates with a non-positive vent static pressure and with a flue loss not less than 17%. The furnace
is fan assisted, i.e., an appliance equipped with an integral means to either draw or force products of
combustion through the combustion changer and / or the heat exchanger. The installation of the furnace
vent must be in accordance with the National Fuel Gas Code ( NFGC ), ANSI Z223.1-2000/NFPA 54-
2002, and /or Section 7 and Appendix C of the CSA B149.1-00, National Standard of Canada, Natural Gas
& Propane Installation Code; the local building codes; furnace and vent manufacturer’s instructions. The
air conditioner with gas heat shall not be connected to a chimney flue serving a separate appliance designed
to burn solid fuel. Do not connect any other vents or flues from any other appliances to the flue of the unit.
Multistory venting is prohibited. Single wall metal vents shall not be used. Vents must be installed verti-
cally. Use only the vent supplied with the unit. Vent connectors shall not be connected into any portion of
mechanical draft systems operating under positive pressure.
WARNING
CARBON MONOXIDE POISONING, FIRE, AND EXPLOSION HAZARD
Failure to properly vent this furnace could result in death, personal injury and / or property damage. Read and
follow all the instructions in this section.
AVERTISSEMENT
DANGER DE MONOXYDE DE CARBONE, D’INCENDIE OU D’EXPLOSION
Une mauvaise ventilation de cette chaudière peut entraîner blessures graves ou mortelles et / ou dégâts
matériels. Lisez et respectez toutes les instructions dans cette section.
4.18 Installation of the Vent Hood.
1. The vent hood assembly is shipped inside the compressor / lower compartment. Remove the side
screen to access the vent hood assembly.
2. Attach the vent hood for the wall mounted air conditioner with gas heat furnace as shown below.
Maintain 18” clearance between the vent hood and any thing that would restrict or impede air flow
from the hood.
Figure 6. Vent Hood Installation
3. The intake of the combustion air is thru louvers located on the side of the wall mounted air conditioner
with gas heat furnace. Maintain 19” clearance between the louvers and anything that would restrict or
impede air flow into the louvers.
