Minimum clearance
Clearances from combustibles and clearances maintenance must meet the requirements of the manufacturer. In the absence of these, refer to B149.1 existing natural gas. (4.13.2)
Natural gas supply
Stopcock easily accessed manual must be installed in the pipe down or bottom or the horizontal pipe between the pipe and the train of taps of the appliance to natural gas. (6.18.2)
Installation surface
The furnaces to natural gas should be installed on the floor or on a sturdy structure, level and non-combustible. If shims are needed to place the unit level, they must be fixed permanently. (7.13.1)
BAN & RECOMMENDATION
> No air return must be in the same room as the furnace. (7.13.6, 8.21.4)
>Do not install a stainless steel corrugated pipe (WardFlex, TracPipe, etc.) between the shutoff valve and the unit.
> Do not install natural draft system in a room where there would be a negative pressure.
Natural Gas Furnace
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OPERATION
Installed in each dwelling unit, the furnace can heat the air in the home and distribute heat evenly in each room.
Connected to an air distribution system, it allows easy and economical installation of a heat exchanger, an air conditioner and a humidification and electronic air filtration 
Bet on energy-efficient appliances.
Avantages
> Easy to install, the natural gas warm air furnace standardizes air temperature and quality in every room
> Provides fast heat and does not dry the air.
> Enables the exchange filtration and air distribution. Ability to integrate an air conditioning unit and a humidifier.
> Provides the ability to evenly distribute the heat between rooms.
> Greater flexibility in interior design allows with no baseboards or radiators.
> Allows fresh air per piece, as required in Section 9 of the National Building Code.
TIPS FOR INSTALLATION
> The integration of the unit and its pipes should be planned from the architectural design.
>Important: consult the manufacturer's installation manual before installing the furnace and its components
DO NOT FORGET
> Check the following with the installer:
– Device capacity relative to the surface to be heated;
– Location of the generator relative to the length allowed for evacuation vents;
– Outside clearance space required for installation of the drainage system;
– Access to a drain to evacuate the condensation of heating and cooling.
> Provide the location of the outdoor air conditioning unit (condenser) and the thermostat.
>Ideally, install a type of anti-vibration seal canvas on food and the return air
