Direct Vent Furnace Installation

This unit can be installed as either a direct vent or a non direct vent gas central furnace.

Direct vent furnace installation.

14 000 22 000 and 30 000 btu hr. Airflow with temperature rise for cfm versus static is shown in the service facts accompanying this furnace. Wall strap bands are available for this purpose. The installation for this natural type is quite easy with modest cost.

Non direct vent installations combustion air is taken from indoors or ventilated attic or crawl space and flue gases are discharged outdoors. These models require no electricity and are great during power outages. Attractive and economical direct vent furnaces are a popular choice for heating the home. The best is to get a heating technician to install your direct vent gas furnace for you as they have all the knowledge experience and tools but if you fancy yourself to be a handyman you could do the installation yourself.

If you are not properly trained you must not install this unit. The ml193df can be installed as a direct vent or non direct vent gas central furnace. Always install the furnace to operate within the furnace s intended temperature rise range with a duct system which has an external static pressure within the al lowable range as specified on the unit rating plate. Direct venting uses a power ventilating blower or fan and in some models a heat exchanger plenum to cool outgoing gases passing through the building wall sidewall direct exhaust or roof or through an existing unused chimney through which a vent pipe is passed vertical direct exhaust.

In direct vent installations combustion air is taken from outdoors and flue gases are discharged outdoors. Rinnai direct vent appliance must be installed by a state qualified or licensed contractor and a properly trained rinnai installer. However this kind of vent is commonly experiencing back drafting where the indoor air pulls the combustion gas back to the indoor. When the vent is withdrawing air from the house it expels the gas outside through the vent.

Figure 1 direct vent installation non direct vent installation exhaust outlet combustion air intake outside of house combustion air intake. Direct vent gas furnaces are contained in a sealed combustion box which makes installation very easy. All offset or horizontal runs must be supported at least every 8 feet. In non direct vent installations combustion air is taken from indoors and flue gases are discharged outdoors.

Non direct vent installations combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged outdoors. See figures 1 and 2 for applications involving roof termination.