NOTE: Studies indicate that it only takes 8 ounces of dirt to ruin an engine
Centri pre-cleaners Remove dirt particles before they get to your air filter

Get Cleaner Air For your Equipment Make Your Air Filter Last Much Longer As A Result Prolong Your Engine Life And Also Increase Engine Performance Extends air filter life up to 12 times Compatible with all air filter systems Expels dirt so it is maintenance free Removes dirt, chaff, dust, snow, rain Aluminum & stainless steel construction Precisely balanced for noise free operation 8 models cover 50-1600 cubic feet per minute How It Works 1. Dirty air enters the Centri pre-cleaner, which is clamped onto your equipment air intake. 2. Specially designed vanes direct the air Flow, move the dirty air toward the stainless steel impeller. 3. The impeller creates a tornado inside The pre-cleaner housing. 4. The centrifugal force of the tornado expels the heavier than air dirt, dust, chaff, etc out of the discharge louver. 5. Cleaned air enters the engine intake pipe so the air filter element only has very light particles to remove. On Centri models pages within our A&I on-line parts catalog see slide show/video about how it operates. Depending on spacing and filter housing location the Centri may be under the hood or above the hood. A three inch minimum clearance is required between your equipment’s hood and the bottom of the Centri. Sizing Guidelines For Centri Pre-cleaners The air intake inlet pipe size is NOT the determining factor for choosing a pre-cleaner. Pre-cleaners must operate at a certain RPM to be effective. Therefore the pre-cleaner must be sized to the engine. Within our on-line parts catalog in the pre-cleaner model pages use the automatic CFM calculator to determine the proper size pre-cleaner for your application. Or you may use the formulas guides below to make the CFM calculations yourself.

C.F.M. FORMULA C.F.M.= CUBIC FEET PER MINUTE For all engines, the C.F.M. can be determined by using the formula below: 4 CYCLE ENGINES C.F.M. = C.I.D. x R.P.M. x Vol. Eff. / 3456 VOLUMETRIC EFFICIENCY: Diesel Naturally Aspirated = .85 Turbocharged = 1.60 Turbocharged-Aftercooled = 1.85 Gasoline up to 2500 r.p.m. = .80 2500 to 3000 r.p.m. = .75 3000 to 4000 r.p.m. = .70 2 CYCLE ENGINES C.F.M. = C.I.D. x R.P.M. x Vol. Eff. / 1728 VOLUMETRIC EFFICIENCY: Diesel Blower-Scavenged = 1.40 Turbocharged = 1.90 Turbocharged-Innercooled = 2.10 Gasoline up to 2500 r.p.m. = .85 2500 to 3000 r.p.m. = .80 3000 to 4000 r.p.m. = .75 C.I.D.-Cubic Inch Displacement R.P.M.-Revolutions Per Minute (high end of your main operating) Vol.Eff.-Volume Efficiency To convert Metric Displacements to C.I.D. for use in the formulas, use the following conversion factors: Displacement in Cubic Centimeters (cm3) x 0.06102 = C.I.D. Displacement in Liters x 61.02 = C.I.D. NOTE: Engines equipped with twin air intake pipes, divide the engine C.F.M. by two and apply the proper Centri Pre-cleaner to each of the pipes. The Centri pre-cleaner models, dimensions, and CFM Ranges Product Specifications, U.S. *Please make sure it’s going to fit your location before ordering. They can be mounted straight up, sideways, and even upside down. CENTRI MODEL NO. A Inches B Inches C Inches Weight Pounds Recommended CFM Range EX-20 5.25 3.375 2 1 50-100 EX-25 6.5 4.25 2.5 1.75 100-200 EX-30 6.5 5.0 3 2.75 150-275 EX-40 8.875 5.875 4 3.75 200-400 EX-50 11.25 7.5 5 6.5 350-700 EX-60 12.75 7.75 6 7.25 500-950 EX-70 14.75 8.5 7 9.5 750-1350 EX-80 14.75 8.5 8 9.5 950-1600 Reduce Vibration With Rubber Adapters - Highly Recommended !!!! When your Centri Model Has The Same Inside Diameter As Your Air Cleaner Intake Rubber Hump Hose With Clamp Part # I.D.-I.D. Hose Length A-94400 4” 5.5” A-94500 5” 6” A-94600 6” 7” A-94700 7” 7” A-94800 8” 6” When Your Centri Model Has A Different Inside Diameter Than Your Air Cleaner Intake Rubber Hump Hose Reducer With Clamp Part # I.D.-I.D. Hose Length A-954030 4” – 3” 5.25” A-954045 4”-5.5” 6” A-955040 5”-4” 5.5” A-955055 5”-5.5” 6” A-956050 6”-5” 6” A-956055 6”-6.5” 6” A-957060 7”-6” 6” A-958060 8”-6” 6” A-958070 8”-7” 5” When You Want Anti-Vibration Rubber With Centri & Air Cleaner Nearly Touching Short Rubber Insert Extrusion *O.D. is of Centri opening and I.D. is of air cleaner intake opening Part # I.D.-I.D. A-972522 2.5”-2.25” A-973027 3”-2.75” A-974030 4”-3” A-974035 4”-3.5” A-974037 4”-3.75” A-975040 5”-4” A-975045 5”-4.5” A-975047 5”-4.75” A-976050 6”-5” NOTE: Additional steel adapter stacks, steel extension pipes, and rubber elbows are available through our A&I catalog. Call us when you are looking for such adapters. The Centri comes with a lifetime warranty. This warranty doesn’t include damage to the Centri unit caused by user misuse, abuse, accident, or improper installation. Centri Pre-Cleaners Come With Mounting Instructions & Warranty To Purchase Your Centri Pre-Cleaner Please Enter Our: Aftermarket Parts Catalog WHAT WILL CENTRI PRECLEANERS FIT? The Centri air filter pre-cleaner not only fits tractors, combines, and other AG equipment, but it also works on mining equipment, construction equipment, road maintenance equipment, logging equipment, and more. What kind of air filter will you keep cleaner?