Greenheck 240XP-CUb - Manuals

Reading Performance Charts Assume that a job requires a belt drive roof exhausterto move 1000 cfm against 0.25 in. Ps. Refer to theperformance model at the bottom of this page. Start atthe top of the chart with the 0.25 in. Ps column. (Allnumbers in this column correspond to .25 in. Ps.) Nowfollow t...

Model Common Accessories Roof Curb G & GB Backdraft Damper Roof Curb CUBE Grease Trap SB Wall Mount Housing orWall Mount Collar Model Common Accessories Speed Control SP & CSP Discharge Vents Backdraft Damper SQ & BSQ Vibration Isolators One advantage of choosing the GB-101-4-R2 over the...

Model RSF and BCF Selection The RSF and BCF selection charts are different from allother selection charts. For these models, the cfmvalues are at the left side of the chart in a single columnand the rpms are in the performance boxes. It is just theopposite for other models. The reason for this is th...

Cross Reference Chart (Models in italics refer to older models) Direct Drive120 W 10 D Direct Drive rpm x 100 Model ACW Wheel Size Belt Drive150 V 6 B Belt Drive 3/4 hp Model VCR Wheel Size = 15 in. Direct DrivePW 135 A 8 860 rpm 1/20 hp Wheel Size =13.5 in. Model PW Belt DrivePNN 163 G 1/2 hp Wheel...

FAN SELECTION BASED ON FAN APPLICATION Direct Drive vs Belt Drive Direct drive fans are economical for low volume (2000cfm or less) and low static pressure (0.50 in. or less).They require little maintenance and most direct drivemotors can be used with a speed control to adjust thecfm. Belt drive fan...

Recommended Exhaust Fans Commercial Kitchen Ventilation Model CUBE Model USGF Model CWB Model SWB Belt Drive Belt Drive Belt Drive Belt Drive Upblast Roof Exhaust Upblast Roof Exhaust Sidewall Exhaust Utility Blower 300-30,000 cfm 300-7,000 cfm 300-12,000 cfm 500-30,000 cfm Up to 5.0 in. wg Up to 3 ...

Commercial Kitchen Ventilation Fan Sizing Exhaust When not specified by local codes, the following guidelines may be usedto determine the minimum kitchen hood exhaust cfm. Some local codesrequire 100 cfm/ft. 2 of hood area for wall style hoods. Supply Recommended supply airflow is 90% ofexhaust cfm....

General Commercial Ventilation Models SQ and BSQ are versatilefans that can be used for exhaustor supply and can be mounted inany position. Two removable sidepanels provide access for service. Model G Direct Drive Roof Exhaust90-3,200 cfmUp to 1.0 in. wg Model GB Belt Drive Roof Exhaust80-44,700 cfm...

General Industrial Ventilation Typical Applications Propeller fans are ideal for ventilating high air volumes at low static pressures (0.50 in. or less). Industrialapplications often include factories and warehouses. A variety of fan models offer flexibility for roof or wall mountas well as exhaust ...

High Static Pressure Ventilation Typical Applications Models SWB and BSQ are general, all-purpose fans that are capable of moving high air volumesagainst high static pressures (up to 5.0 in wg). High static pressures are generated by long or complexduct systems, especially when capture hoods are pre...

Area Min./Chg. Area Min./Chg. Area Min./Chg. Assembly Hall 3-10 Dance Hall 3-7 Machine Shop 3-6 Attic 2-4 Dining Room 4-8 Mill 3-8 Auditorium 3-10 Dry Cleaner 2-5 Office 2-8 Bakery 2-3 Engine Room 1-3 Packing House 2-5 Bar 2-4 Factory 2-7 Projection Room 1-2 Barn 12-18 Foundry 1-5 Recreation Room 2-...

Determining Static Pressure (Ps) The pressures generated by fans in ductwork are very small.Yet, accurately estimating the static pressure is critical toproper fan selection. Fan static pressure is measured in inches of water gauge.One pound per square inch is equivalent to 27.7 in. of watergauge. S...

Motor Horsepower The motor horsepower for direct drive fans is alwayssized by Greenheck and does not require furtherconsideration. For belt drive models, the catalogidentifies which horsepower is recommended.However, there are times when it is wise to bump thehorsepower one size. For example, the hp...

Installation To ensure proper fan performance as cataloged,caution must be exercised in fan placement andconnection to the ventilation system. Obstructions,transitions, poorly designed elbows, improperly selected dampers, etc., can cause reducedperformance, excessive noise, and increasedmechanical s...

FAN PERFORMANCE System Dynamics For a given flow rate (cfm), an air distribution systemproduces a resistance to airflow (Ps). This resistance isthe sum of all static pressure losses as the air flowsthrough the system. Resistance producing elementsinclude ductwork, dampers, grills, coils, etc. A fan ...

Combining Fan and System Dynamics The previous two sections introduced fan curves andsystem resistance curves. This section will show howthese relate to each other to provide an understandingof the way the fan-system operates as a completeentity. Remember that a fan curve is the series of points atw...

Adjusting Fan Performance There is a direct relationship between cfm and rpmwithin a system. Doubling the fan rpm will double thecfm delivered. Sample problem: The figure on page 21 showed a fan curve at 700 rpmwhich had an operating point of 1000 cfm at 0.25 in. Ps.What rpm is required to move 2000...

In a steady-state system, as the fan rpm changes, cfm, Psand BHp (horsepower) also change. The equations below,known better as fan laws, show the relationship betweenthese performance parameters. cfm New = rpm New x cfm Old rpm Old Ps New = ( rpm New ) 2 x Ps Old rpm Old Bhp New = ( rpm New ) 3 x Bh...