What is the difference between direct and non-direct-vent furnace?

Direct vent (two-pipe) vent system This system uses one pipe to bring in outside air for combustion and another to remove exhaust gases. Non-direct (single-pipe) vent system This system uses only one pipe to remove exhaust gases.

What does 90 forced air mean?

AFUE shows how much of the fuel or energy going into a furnace gets converted into heat for your home. An AFUE of 90 percent means that 90 percent of the energy is used as heat, and only 10 percent is wasted, usually up the chimney. Older furnaces can have an efficiency as low as 60 to 70 percent.

What is the difference between a direct-vent and a non-direct-vent?

The two main types of gas fireplaces available today are Direct Vent and Ventless. Direct Vent fireplaces require a venting system while Ventless fireplaces are just that - completely vent-free.

What is a 90 percent furnace?

The 90% furnace uses 90% of the heat generated and only 10% goes to waste. This is also called a condensing furnace because the gas is passed through a heat exchanger and then forced past radiator/coils and the remaining moisture is cooled, condensed, and released. The 90% is best for the comfort for your home.

What does direct-vent mean on a furnace?

A direct-vent wall furnace is a self-contained sealed combustion heating appliance that warms inside air by recirculating it around a sealed chamber, and discharges combustion byproducts outside the home via direct-vent.

Is direct-vent furnace better?

The safest and most efficient venting option is direct venting. As the name indicates, direct venting conveys outside air to the furnace via a sealed pipe. A sealed second pipe usually parallel to or encompassing the smaller supply pipe conveys hot combustion gases from the furnace to the air outside your home.

What is a non-direct vented furnace?

A non-direct vented furnace takes all air for combustion from the room in which furnace is installed. Non-direct venting requires only one pipe for venting the flue gases to the outdoors but you must make sure there is enough air for combustion and ventilation.

What is the difference between direct vent and non-direct vent furnace?

Direct vent (two-pipe) vent system This system uses one pipe to bring in outside air for combustion and another to remove exhaust gases. Non-direct (single-pipe) vent system This system uses only one pipe to remove exhaust gases.

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INSTALLATION INSTRUCTIONS 90 Single Stage Category IV Gas Furnace N9MP1 N9MP2 N9MPD C9MPD H9MPD T9MPD Upflow/Downflow/Horizontal These instructions must be read and understood completely before attempting installation. Safety Labeling and Signal Words DANGER WARNING CAUTION and NOTE The signal words DANGER WARNING CAUTION and NOTE are used to identify levels of hazard seriousness. The signal word DANGER is only used on product labels to signify an immediate hazard. The signal words WARNING CAUTION and NOTE will be used on product labels and throughout this manual and other manual that may apply to the product. DANGER Immediate hazards which will result in severe personal injury or death. WARNING Hazards or unsafe practices which could result in severe personal injury or death. CAUTION Hazards or unsafe practices which may result in minor personal injury or product or property damage. NOTE Used to highlight suggestions which will result in enhanced installation reliability or operation* TABLE OF CONTENTS Safety considerations. Safe Installation Requirements. Installation. Combustion Ventilation Air. Vent and Combustion Air Piping. Concentric Termination. Gas Supply and Piping. Electrical Wiring. Ductwork and Filter. Checks and Adjustments. Furnace Maintenance. Sequence of Operation Diagnostics. Technical Support. Use of the AHRI Certified TM Mark indicates a manufacturer s participation in the program* For verification of certification for individual products go to www. ahridirectory. org. International Comfort Products LLC Lewisburg TN 37091 U*S*A. www. icpusa*com Signal Words in Manuals this manual in the following manner WARNING CAUTION Signal Words on Product Labeling Signal words are used in combination with colors and/or pictures or product labels. Safety alert symbol When you see this symbol on the unit and in instructions or manuals be alert to the potential for personal injury. PERSONAL INJURY AND/OR PROPERTY DAMAGE HAZARD Failure to carefully read and follow this warning could result in equipment malfunction property damage personal injury and/or death. Installation or repairs made by unqualified persons could The information contained in this manual is intended for use by a qualified service technician familiar with safety procedures and equipped with proper tools and test instruments. Installation must conform with local building codes and with the Natural Fuel Gas Code NFCG NFPA 54/ANSI Z223. 1 and National standards of Canada CAN/CSA B149. 1 and. 2 Natural Gas and Propane INSTALLER Affix these instructions on or adjacent to the furnace. CONSUMER Retain these instructions for future reference. Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223. 1 2009 with permission of National Fire Protection Association Quincy MA 02269 and American Gas Association Washington DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI on the referenced subject which is represented only by the standard in its entirety.

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