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General Commercial Ventilation

Models SQ and BSQ are versatile
fans that can be used for exhaust
or supply and can be mounted in
any position. Two removable side
panels provide access for service.  

Model G

Direct Drive Roof Exhaust
90-3,200 cfm
Up to 1.0 in. wg

Model GB

Belt Drive Roof Exhaust
80-44,700 cfm
Up to 3.25 in. wg

Model CW

Direct Drive Wall Exhaust
80-6,000 cfm
Up to 2.25 in. wg

Model CWB

Belt Drive Wall Exhaust
300-12,000 cfm
Up to 2.75 in. wg

The above models are designed for exhausting relatively clean air at temperatures up to 130°F. Motors
are out of the airstream. Direct drive sizes 60-95 are equipped with 3-speed motors for maximum airflow
flexibility. All direct drive units except 1725 rpm (A speed) can be used with a speed control.

Model SP

Ceiling Exhaust Fan
50-1,600 cfm
Up to 1.0 in. wg

Model CSP

Inline Cabinet Fan
100-3,800 cfm
Up to 1.0 in. wg

Models SP and CSP are designed for exhausting relatively
clean air at temperatures up to 110°F. Motors are in the
airstream. All models are direct drive and can be used with
a speed control.

12

Model BSQ

Belt Drive Inline Fan
150-28,000 cfm
Up to 4.0 in. wg

Model SQ

Direct Drive Inline Fan
120-5,000 cfm
Up to 1.75 in. wg

Содержание 240XP-CUB

Страница 1: ...Fan Selection Application Based Selection Performance Theory...

Страница 2: ...e and static pressure This section also interprets Greenheck model numbers and illustrates the relationship between fan speed and airflow Section Two covers the basics of fan selection determining the...

Страница 3: ...N FAN APPLICATION Basic Overview 9 Commercial Kitchen Ventilation 10 General Commercial Ventilation 12 High Static Pressure Ventilation 15 Determining CFM 16 Determining Static Pressure 17 Sound Level...

Страница 4: ...B Model is G rpm is 1140 Nominal Wheel Dia 12 in The table below lists model designation suffixes for motor horsepower and fan rpm Belt Drive Direct Drive Suffix Motor hp Suffix Fan rpm 6 1 6 A 1725 4...

Страница 5: ...1 cfm the fan will be running at 1260 rpm At 1269 cfm the fan will be running at 1635 rpm Therefore there is an rpm for this model that will correspond to 1000 cfm obviously somewhere within the 1260...

Страница 6: ...rpm D 1300 rpm G and 1050 rpm E Changing a motor lead is all that is necessary to change speeds When selecting a model with 3 speed motors it is recommended that the G speed be chosen whenever possib...

Страница 7: ...1 2 hp motor RSF 90 4 1 4 hp motor is not recommended for this job Matching a Specification There will be times when a Greenheck model will have to be matched to a competing manufacturer s unit To ai...

Страница 8: ...WD CW Fumex WFX Domex WX WA WB PDU W PW CWD VWDK VWDB CWD CWF CDU WDC DU CWB GWB ACWB CWB TWB Fumex WFXB Domex WCB WLB PNU W PWB NBTD NBRTD UL 762 VWBK VWBB CWB CBU WBC NCA SP Gemini GC Zephyr Z RA TD...

Страница 9: ...fan model and the air volume flow rate cfm Other considerations include the resistance to airflow static pressure or Ps and sound produced by the fan Sones Occasionally a customer will require a fan t...

Страница 10: ...2 listed for restaurant applications and for operation with air temperatures up to 300 F Recommended Supply Fans The above models are designed to provide efficient economical make up air to replenish...

Страница 11: ...s The National Fire Protection Association specifies minimum distance criteria for restaurant exhaust and supply fans as shown below 10 ft Horizontal Separation 1 Roof deck to top of exhaust fan windb...

Страница 12: ...sting relatively clean air at temperatures up to 130 F Motors are out of the airstream Direct drive sizes 60 95 are equipped with 3 speed motors for maximum airflow flexibility All direct drive units...

Страница 13: ...Typical Commercial Ventilation Installations 13...

Страница 14: ...ount as well as exhaust or supply However because the motors are mounted in the airstream these models are not recommended for temperatures above 110 F Model SB Belt Drive Propeller Sidewall 3 600 85...

Страница 15: ...generated by long or complex duct systems especially when capture hoods are present Both models can be used for either exhaust or supply Model SWB is designed to be mounted indoors or outdoors while...

Страница 16: ...rmal area usage select a lower number in the range to change the air more quickly For moderate climates with lighter usages select a higher number in the range To determine the cfm required to adequat...

Страница 17: ...an be used for estimating static pressure To calculate the system losses one must know the ductwork system configuration see Ductwork figure This duct is sized for air velocities of 1400 feet per minu...

Страница 18: ...8 0 76 15 9 0 77 14 9 0 77 14 8 0 77 14 7 0 78 2318 2104 1875 1587 8 9 0 18 8 5 0 19 8 3 0 19 7 8 0 19 2555 2359 2162 1932 1624 10 6 0 24 10 1 0 25 9 7 0 26 9 4 0 26 8 8 0 25 2909 2737 2567 2382 2176...

Страница 19: ...essure levels For example a sound level of 10 sones is twice as loud as 5 sones Refer to the Suggested Limits for Room Loudness chart to determine the acceptable sone range for the application As a ge...

Страница 20: ...w into the fan Wheel Rotation A common problem is wheel rotation in the wrong direction For centrifugal fans incorrect wheel rotation will provide some airflow However the airflow will be far below th...

Страница 21: ...application The information in this section is useful once the fan has been selected and installed on the job The fan curves and system resistance curves below will help to solve fan performance probl...

Страница 22: ...ossible to move 2000 cfm at only 0 25 in Ps For any given system every cfm requires a unique Ps This series of cfm Ps points forms a system resistance curve such as the one above Once the system resis...

Страница 23: ...that as we doubled our airflow from 1000 cfm to 2000 cfm the Ps went up from 0 25 in to 1 0 in It must be kept in mind that we are not changing the system only increasing fan speed Therefore we must...

Страница 24: ...s in those sections on how to apply these equations The third equation relates horsepower to rpm The change in horsepower can be determined when the rpm is increased by 25 This is shown below BhpNew 1...

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