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	FAQ Type: [ General ] [ HVAC Definitions ] [ Misc ] Frequently Asked Questions: General Where can I find a dealer for new HVAC Equipment or replacement parts of existing units? Can I purchase units or replacement parts on line? Can I get some advice on installing or repairing my Reznor HVAC Equipment? I have an old Reznor Heater from the 1940's, 1950's, 1960's, 1970's, 1980's, or 1990's in my home / business. Are replacement units or parts available? I am an Engineer/Architect. How can I get technical specifications for your HVAC Equipment? How can I get a wiring diagram for specific piece of equipment? Is there a kit available that will change my Reznor Heater from natural gas to propane fueled (or propane to natural gas)? I need an installation / operation / maintenance / parts /or other type of manual for my hvac equipment. Where can I find this information? What size heater do I need for a space/room that measures (x ft. wide by y ft. deep) I am an hvac/mechanical engineer instructor at my institution (or, I am a student working on a project). Do you have any instructional information on heating and heating equipment. I have an old Reznor Heater. How can I determine exactly how old it is? Is there a comparison tool for Direct Fired versus LDAP units? What is the New York City Approval ( MEA ) Number for Reznor Models? When Engineers specify “CFM”, do they mean ACFM or SCFM? Frequently Asked Questions: HVAC Definitions What is the difference between ACFM and SCFM? Frequently Asked Questions: Misc Is Trent Reznor, the lead singer for the band Nine Inch Nails, associated with Reznor HVAC Equipment? Are those Reznor Unit Heaters hanging in the background of Michael Douglas' loft apartment in the movie, "It Runs in the Family"? What is the difference between ACFM and SCFM? ACFM (actual cfm) is the volume of air moved per minute by a fan regardless of air density.  According to the fan laws, a fan will move the same volume of air at a given RPM, regardless of air density.  As the air gets denser, the fan does more work, and brake hp increases, but ACFM remains constant.  SCFM (“standard” cfm) is the volume of air moved by a fan at a given RPM when that fan is at sea level and the blower temperature is 70 deg F (for HVAC applications – the definition may be different for compressors, etc ).  For HVAC calculations, Dry Air Mass Flow (DAMF, measured in lb dry air per hour) is used, because cooling BTUH is easily calculated by: Cooling BTUH = DAMF x (h1 – h2),  where h1 and h2 are the entering and leaving enthalpies, respectively.