Est. 1998 — 27 years of woodworking knowledge
Happy New Year to all! and a HVAC question
Denis Ch�nard, Orl�ans, Ont.
>Best wishes to all, looking forward to another year at WC :-)
Question: what kind of CFM does a furnace blower pump? Mine was taken off my old furnace last summer, it is 20+ years old, has a 1/3 HP motor, and the furnace was rated at 125,000 BTU if my memory serves me right.
TIA,
DC
Re: Happy New Year to all! and a HVAC question
Paul Leuba
>Denis:
Last year I had a 1 1/2 ton heat pump installed in my shop. The 1/6 HP motor runs on two speeds, the low speed delivers approximately 650 CFM and the high speed delivers approximately 900 CFM. The blower operates at 900 RPM on high speed. I can not find in the documentation the RPM for low speed operations.
Hope this helps.
Paul in Hunt Valley
Re: Happy New Year to all! and a HVAC question
Al Stokka - Cambridge, Iowa
>Denis,
Mine has a five-speed direct drive 1/3 HP motor. At 0 static pressure, at the various speeds it will move (in CFM):
low - 1520
med-low - 1725
medium - 1940
med-high - 2140
high - 2275
The furnace is about 45,000 BTU on propane.
Al
1200-1500 cfm
Jim in Burlington On
>Without the fan curve it's just a good guess.
Re: Happy New Year to all! and a HVAC question
Bill Turpin in WNC mountains
>About 1200 tops. It takes 3/4 HP for 2000 cfm if installed in a closed loop duct system.
Bill in WNC mountains
NC Refrigeration License #2821
Re: Happy New Year to all! and a HVAC question
Larry Clinton in Frankfort, Indiana
>Dennis, a good site for reference would be W W Grainger. They sell many replacement blower units for furnaces and you may find one with the same hp and fan diameter which would give you a good idea. Twenty years ago they were still selling some furnaces without the capability of adding central air - the units which will accomodate CA usually have a higher fan capacity.