This article's table of contents introduction:
- Scenario A: You mean 1000 CFH (16.7 CFM)
- Scenario B: You mean 1000 CFM (60,000 CFH)
- How to Properly Specify the Fan (Critical!)
- Recommendation
To give you an accurate answer about a "1000 CFH centrifugal fan," I need to clarify a critical point: CFH typically stands for Cubic Feet per Hour.
However, 1000 CFH is a very low flow rate (about 16.7 CFM). Centrifugal fans at this flow rate are usually very small (e.g., for lab exhaust, small boilers, or fume hoods) or you might be looking for 1000 CFM (Cubic Feet per Minute) , which is a much more common size for industrial ventilation.
Here is a breakdown of what to expect for 1000 CFH vs 1000 CFM, and how to specify the fan.
Scenario A: You mean 1000 CFH (16.7 CFM)
This is a small, specialized fan.
- Typical Applications:
- Small wood stoves or pellet stoves (draft inducer).
- Laboratory fume hoods (low flow).
- Electronic equipment cooling.
- Small paint booths.
- Fan Type: Likely a Forward Curved (Squirrel Cage) blower or a Backward Inclined for higher pressure.
- Duct Size: Probably 3" to 5" diameter.
- Motor: Typically 1/20 HP to 1/8 HP, 115V or 230V single phase.
- Sample Specs (1000 CFH @ 0.5" w.g.):
- Price: $100 - $300 (e.g., Dayton, Fasco, Greenheck small units).
- Inlet/Outlet: 4" round side ports.
- Sound: 50-65 dBA (relatively quiet).
Scenario B: You mean 1000 CFM (60,000 CFH)
This is a standard, medium-sized industrial fan.
- Typical Applications:
- Medium warehouse ventilation.
- Spray booths.
- Dust collection (pre-filter).
- HVAC make-up air units.
- Fan Type: Backward Inclined (most efficient for this flow) or Airfoil (best efficiency).
- Duct Size: 10" to 14" diameter.
- Motor: 1/2 HP to 1 HP, 115/230V or 208V/460V three-phase.
- Sample Specs (1000 CFM @ 1.0" w.g.):
- Price: $500 - $1,500 (e.g., Greenheck, Chicago Blower, Cincinnati Fan).
- Inlet/Outlet: 10" or 12" round or square.
- Sound: 70-85 dBA (may require silencers).
How to Properly Specify the Fan (Critical!)
A centrifugal fan is defined by Flow (CFM/CFH) AND Static Pressure (SP) . Without the pressure requirement, your fan will either fail to push air through ductwork or will run inefficiently.
You must answer these 4 questions:
- Flow Rate: Exactly 1000 CFH (16.7 CFM) or 1000 CFM (60,000 CFH)?
- Static Pressure (in w.g.): Use a manometer or estimate (e.g., 0.5" for low resistance, 1.0" for standard, 2.0"+ for filters or long duct runs).
- Motor Voltage: 115V, 230V single phase? Or 208V/460V three phase?
- Temperature: Standard room temp (70°F) or hot air (300°F+)?
Quick Rule of Thumb:
- 1000 CFH @ 0.5" SP $\rightarrow$ Small blower (e.g., Fasco, Grainger 4").
- 1000 CFM @ 1.0" SP $\rightarrow$ Medium industrial fan (e.g., Greenheck BIDW).
Recommendation
If you truly need 1000 CFH: Search for "100 CFM centrifugal blower" (1 CFM = 60 CFH, so 1000 CFH $\approx$ 16.7 CFM). Look for models like the Dayton 2M175 or Fasco A200 series.
If you need 1000 CFM: Search for "1000 CFM backward inclined fan" or "1000 CFM inline centrifugal fan." Look for models like the Greenheck BIDW-220 or Soler & Palau TD-2000.
Next Step: Please confirm if you need 7 CFM (1000 CFH) or 1000 CFM, and what static pressure you are fighting against (duct length, filters, etc.).
