# Fan Applications & System Guide

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1 Fan Applications & System Guide Airflow for general ventilation can be calculated by; Area Method Air Change Method Occupancy Method Ventilation Calculation Methods Area Method Derives the ventilation rate from the area of the space (in square feet) to ventilated multiplied by ventilation rate per square foot. Example: For residential bathrooms up to 100 sq. ft. in area, HVI recommends an exhaust rate of 1 CFM per square foot. A bathroom is 6 x 10 or 60 sq. ft. Multiply 1 cfm x 60 sq. ft. for a flow rate of 60 cfm. Air Change Method - Derives the ventilation rate from the volume of the space (in cubic feet) to be ventilated multiplied by the number of total air changes in one hour. Example: For an auditorium the suggested air change rate is 4 to15 air changes per hour. An auditorium is 80 x 90 with 20 ceiling or 144,000 cu. ft. Use 10 air changes per hour. CFM = 144,000 cu. ft. x 10 AC p/ hr CFM = 24, Occupancy Method - Derives the ventilation rate from the number of people that will occupy the space at any given time. Example: For an office, the recommended ventilation rate is 20 cfm per person. The occupancy of a general office is one person per 80 to 150 sq. ft. An office is 40 x 60 or 2,400 sq. ft. Occupancy = 2,400 sq. ft./150 sq, ft p/ person CFM = 16 people x 20 cfm per person CFM = 320 Heat Removal Method When the temperature of a space is higher than the ambient outdoor temperature general ventilation can be used to provide cooling. What is needed to calculate CFM is the amount of heat to be removed in BTU/hr, the desired indoor temperature and design outdoor dry bulb temperature. Example: 200,000 BTU/hr to be removed, 70 degree desired indoor temperature and 90 outdoor dry bulb temperature. CFM = 200,000 (BTU/hr) / (1.08 x 90-70) CFM = 9,260 (Note: rule of thumb outdoor / indoor temperature differential is 20 degrees)

2 Applications Listed below are ventilation rates for some common applications. Where more than one method is shown use the method that results in the higher airflow rate. Application Area Air Change Occupancy Method Other Method Method cfm/ person sq ft/ person General Ventilation 1 cfm Attic Ventilation.7 cfm 10 Auditoriums 4 to 15 Banks 4 to to 150 Battery Charge Room 1.5 cfm 4 Boiler Room 15 to 30 Chemical Storgage Area 1.5 cfm Class Room Computer Room 15 to to 150 Conference Room Corridors.05 cfm Churches 20 5 to 20 Elevators 1 cfm Electrical Room 2 cfm 10 5 cfm / KVA of transf. Fire Station 4 to to 500 Garage (Parking) 1.5 cfm 5 to 15 Garage (Repair) 6 to cfm / car Gymnasium 6 to 30 Hospital (Patient Rooms) Kitchen Hood (Charbroiler) 300 cfm x linear. ft.. Kitchen Hood (Island Type) 150 cfm / sq. ft. Kitchen Hood (Wall Mounted) 100 cfm / sq. ft. Kitchen (General Ventilation) to to 150 Libraries / Museums to 100 Locker Room 12 to 30 Manufacturing (Light) 5 to 10 Manufacturing (Heavy) 10 to 20 Mechanical Room 2 cfm Mech. Room (Combustion Air) 8 cfm / BHP Mech. Room (Comb. Exhaust) 2 cfm / BHP Medical / Dental Office 8 to to 150 Municipal Buildings 4 to to 150 Police Station 4 to to 500 Retail Store.3 cfm to 75 Supermarket to 100 Toilet Room (Public) 75 cfm p/ WC & urinal Toilet Room (Residential) 1 cfm 8 Warehouse Ventilation 1 cfm 6 to 15 Welding Operation 2500 cfm p/ welder

3 Systems General Ventilation Plan and Spec Jobs - required airflow and system static pressure is calculated by the engineer and is listed on the fan schedule. Retro Fit and Design Build Jobs - the system static pressure can be calculated using the required airflow, the duct size, duct layout and total duct length and duct friction loss chart (Friction Loss Chart needed). When the duct layout is not known the following rules of thumb can be used to estimate system static pressure 1. Non Ducted Applications -.10 to Ducted Applications -.20 to.40 per 100 feet of duct (based on duct velocity of 1000 to 1800 feet per minute). Fittings.08 per fitting (elbows, register, grille, damper) Example: Retrofit a fan for a mechanical room. Area of room is 20 x 60 or 1,200 sq, ft. Fan is ducted to roof with 16 x 16 duct. Total duct run is 25. There are 2 elbows and a grille in the system. Required Air Flow - 2,400 cfm. (2 cfm p/ sq. ft. x 1200 sq. ft.) Duct Velocity 1,400 fpm (air flow / duct area) Duct Losses -.08 (.30 / 100 ft of duct x 25 ) Fitting Losss -.24 (.08 x 3 fittings) Estimated SP. = , round to nearest 1/8. Size Fan for 2,400 sp Another rule of thumb that can be used if number of fittings is not known is; Estimated SP. = 1.5 x System Length (ft.) x Friction Rate (Inches W.G.)* *Friction Loss Chart needed Kitchen Hoods Use.625 to 1.50 sp. Minimum duct velocity 1,500 fpm Make up air 80% of exhaust air Sound Level Guidelines Application Sones Bathroom 13 to 18 Conference Room 1.7 to 5 Corridors 9 to 13 Church 1.5 to 5 Hospital Private Room 1.7 to 5 Hospital Ward 2.5 to 9 Kitchens 10 to 18 Application Sones Manufacturing (Light) 12 to 36 Manufacturing (Heavy) 20 to 50 Office (Open) 4 to 12 Office (Professional) 3 to 9 Post Office 4 to 12 Schools & Classrooms 2.5 to 8

4 Basic Fan Laws Fan Laws are equations used to predict a fan s performance at other conditions. Once a system is installed if the CFM, SP and BHP are known (by measurement) the CFM, SP and BHP at every other point along the system curve can be calculated. VARIATION FAN SPEED CHANGE DENSITY CHANGE VOLUME PRESSURE With Speed Ratio cfm2 = cfm1 (rpm2 / rpm1) Varies with SQUARE of Speed Ratio No Change with density Ratio P2 = P1 (rpm2 / rpm1) 2 P2 = P1 (D2 / D1) HORSE Varies wwith CUBE of Speed Ratio with density Ratio POWER hp2 = hp1 (rpm2 / rpm1) 3 hp2 = hp1 (D2 / D1) Example: Fan is selected at 4,000 SP, 825 RPM and.72 BHP. Balancer reports 3,000 SP, 825 rpm and motor operating at nameplate full load amps. Calculate the required RPM using fan laws CFM2 / CFM1 = RPM2 / RPM1 4,000 / 3,000 = RPM2 / 825, New RPM = 1100 Calculate the new SP using fan laws SP2 / SP1 = (RPM2 / RPM1)2 SP2 /.375 = (1100 / 825)2, New SP =.67 Calculate the new BHP using fan laws BHP2 / BHP1 = (RPM2 / RPM1)3 BHP2 =.75 because fan motor was operating nameplate amps BHP2 /.75 = (1100 / 825)3, New BHP = 1.78 The system SP is actually higher than calculated. To meet the operation point at the new SP the fan will need to operate at 1,100 rpm and will require a 2 hp motor.

5 Air Density Correction Fan performance tables are based on standard air conditions. An installation s altitude and the air temperature will affect the air density. Use the Air Density Correction Factors (df) listed below to determine the corrected fan performance. Correction for temperatures between 40 deg. F and 100 deg. F and/or elevations between 1,000 ft. and +1,000 ft. are generally not required. Air Density Correction Factors (df) Altitude TEMPERATURE (Degrees F) (Ft) Example: A fan is selected to deliver 4,000 SP. Fan will be installed 5,000 ft above sea level; air temperature is 70 deg. F. From the Air Density Correction Factor table above the density correction factor (df) is determined to be.86 by using the fans operating altitude. Divide design SP by the Air Density Correction Factors (df).25 sp /.86 =.29 sp It is determined by from the fan performance table that the fan must operate at 774 rpm to develop the design CFM at the corrected SP at 5,000 feet above sea level at the operating temperature of 70 deg. F. From the fan s performance table it is determined that at standard conditions.51 BHP is needed meet the design point. This is corrected to conditions at altitude by multiplying the BHP by the Air Density Correction Factor.51 BHP x.86 =.44 BHP The final operating conditions at altitude are determined to be 4,000 SP, 774 rpm and.44 BHP

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