HVAC & Airflow calculators

340 free hvac & airflow tools, each with the formula and step-by-step working.

• 3D Printer Enclosure Ventilation CalculatorExhaust airflow for an enclosed FDM/resin 3D printer.
• ACFM to SCFM CalculatorActual to standard cubic feet per minute.
• ACH to CFM CalculatorFan size from the air changes you want.
• ACH50 to Natural ACH CalculatorEstimate natural infiltration ACH from a blower door ACH50 result.
• Air Balance CalculatorCompare design CFM against measured CFM per branch.
• Air Balancing Percent CalculatorCompare measured airflow to design targets.
• Air Compressor CFM CalculatorCompressor size from tool air demand.
• Air Density CalculatorAir density from temperature, pressure and altitude.
• Air Density Correction CalculatorAir density from temperature and altitude for fan corrections.
• Air Purifier CADR CalculatorCADR needed for a room and resulting ACH.
• Air Purifier CADR to ACH CalculatorAir changes per hour from a purifier's CADR rating.
• Air Receiver Tank Size CalculatorTank volume for a compressed air system.
• Air Velocity CalculatorDuct air speed in FPM, m/s and mph.
• Altitude Airflow Correction CalculatorCorrect CFM and capacity for altitude.
• Altitude Fan Derate CalculatorFan pressure and horsepower derate at high altitude.
• Anemometer Traverse Average CalculatorAverage velocity and CFM from grid anemometer readings.
• Animal Shelter Ventilation CalculatorAir changes per hour for an animal shelter housing area.
• Aquaculture Blower CFM CalculatorRegenerative blower airflow for pond/tank aeration.
• Attic Fan CFM CalculatorPowered attic ventilator size and intake area.
• Attic Temperature Reduction CalculatorCooling effect of attic ventilation.
• Available Static Pressure CalculatorAvailable static pressure for duct design.
• Axial vs Centrifugal Fan CalculatorCompare which fan type suits your CFM and pressure requirement.
• Bar Ventilation CalculatorOutdoor air CFM for a bar or lounge.
• Barn Ventilation CFM CalculatorLivestock barn airflow by animal weight.
• Basement Exhaust Fan CalculatorMechanical ventilation airflow for a basement.
• Basement Ventilation CFM CalculatorFan size for a basement or cellar.
• Bathroom Fan CFM CalculatorExhaust fan size for any bathroom.
• Bathroom Fan Duct Size CalculatorDuct diameter and run length limits for an extractor.
• Bathroom Fan Fixture Count CalculatorExhaust fan CFM by bathroom fixtures.
• Bathroom Fan Sone Noise CalculatorCompare fan loudness and estimate combined sone level.
• Battery Room Ventilation CalculatorHydrogen dilution airflow for battery banks.
• Bedroom CFM CalculatorSupply airflow for a bedroom.
• Belt Length Calculator (Fan Drives)V-belt length from center distance and sheave sizes.
• Blower Door ACH50 CalculatorConvert blower door CFM50 to ACH50 and natural ACH.
• Blower Door CFM50 CalculatorBuilding leakage flow at a 50 Pascal test pressure.
• Blower Wheel Tip Speed CalculatorPeripheral tip speed of a centrifugal blower wheel.
• Boiler Combustion Air CalculatorCombustion air openings for a gas or oil boiler room.
• Branch Count per Ton CalculatorTypical number of branch runs per ton of AC.
• Branch Duct Size CalculatorBranch duct size from register CFM.
• BTU to CFM CalculatorAirflow from heating or cooling load.
• Building Negative Pressure CalculatorNet pressure balance from supply and exhaust.
• Bypass Damper Size CalculatorBypass duct size for a zoned HVAC system.
• Cannabis Grow Room Airflow CalculatorCirculation and exhaust CFM for a cannabis grow room.
• Carbon Filter CFM CalculatorMatch filter rating to fan and check contact time.
• Ceiling Fan CFM CalculatorCeiling fan airflow needed for a room.
• Ceiling Fan Size CalculatorBlade span and CFM for a room.
• CFM CalculatorAirflow in cubic feet per minute from room size and air changes.
• CFM per Square Foot CalculatorAirflow intensity per square foot of floor area.
• CFM per Ton CalculatorAirflow per ton of cooling capacity.
• CFM per Watt CalculatorAirflow efficiency of a fan in CFM delivered per watt consumed.
• CFM to BTU CalculatorHeat carried by an airstream.
• CFM to CFH CalculatorConvert cubic feet per minute to cubic feet per hour.
• CFM to CMH CalculatorCFM to cubic metres per hour, shorthand CMH.
• CFM to CMM CalculatorConvert CFM to cubic metres per minute.
• CFM to FPM CalculatorAir velocity in feet per minute from CFM and duct size.
• CFM to kg/s CalculatorConvert volumetric CFM to a mass airflow rate.
• CFM to L/s CalculatorConvert CFM to litres per second.
• CFM to m³/h CalculatorConvert cubic feet per minute to cubic metres per hour.
• CFM to m³/min CalculatorConvert CFM to cubic meters per minute.
• CFM to MMBtu CalculatorConvert airflow heating/cooling duty to MMBtu/hr.
• Chemical Storage Ventilation CalculatorExhaust airflow for a flammable/chemical storage room.
• Chicken Coop Ventilation CalculatorVent area and fan CFM for a coop.
• Chiller Tons to CFM CalculatorAir handler airflow for a chiller load.
• Chimney Draft CalculatorStack effect draft from height and temperature.
• Church HVAC Load CalculatorCooling airflow for a church sanctuary by capacity.
• Cigar Humidor CalculatorHumidification device sizing for a humidor room.
• Classroom Ventilation CalculatorVentilation and filtration for a classroom.
• Cleanroom Air Changes CalculatorACH and HEPA coverage by ISO class.
• CMH to CFM CalculatorCubic metres per hour to CFM.
• CNC Dust Collection CFM CalculatorDust collection airflow for a CNC router or mill.
• CO2 Ventilation Rate CalculatorOutdoor air needed to hold a CO2 target.
• Commercial Hood Linear Foot CalculatorTotal exhaust CFM from multiple hood sections.
• Commercial Laundry Exhaust CalculatorExhaust airflow for a commercial laundry facility.
• Compost Room Ventilation CalculatorExhaust airflow for an indoor compost or organics room.
• Compressed Air Pipe Size CalculatorPipe diameter for a compressed air line.
• Cooling Load Tons to CFM CalculatorConvert refrigeration tons directly into supply air CFM.
• Cooling Tower Airflow CalculatorAirflow and evaporation for a cooling tower.
• CRAC Unit Sizing CalculatorPrecision cooling capacity and redundancy.
• Crawl Space Ventilation CalculatorVent area or fan CFM for a crawl space.
• Crawlspace Exhaust Fan CalculatorFan airflow for a vented or sealed crawlspace.
• Cyclone Separator Sizing CalculatorCyclone inlet velocity and body diameter.
• Dairy Barn Ventilation CalculatorFan airflow for a dairy freestall barn by cow count.
• Damper Authority CalculatorControl authority of a modulating damper in a duct system.
• Data Center CFM per kW CalculatorRack airflow from IT load and delta T.
• Data Hall Cooling CFM CalculatorCooling airflow for a data hall from rack load.
• Dehumidifier Size CalculatorPints per day for a room or whole home.
• Delta T HVAC CalculatorSupply and return split with a health verdict.
• Dental Surgery Ventilation CalculatorAir changes and pressure for a dental operatory.
• Dew Point CalculatorDew point from temperature and humidity.
• Diffuser Count CalculatorNumber of ceiling diffusers for a space.
• Diffuser Throw CalculatorAir throw distance and spacing for diffusers.
• Dish Room Exhaust CalculatorExhaust airflow for a commercial dish washing room.
• Door Undercut Airflow CalculatorAirflow capacity of a door undercut gap.
• Downdraft Vent CFM CalculatorAirflow for a downdraft cooktop ventilator.
• Dryer Vent Airflow CalculatorVent length allowance and airflow check.
• Dryer Vent Length Derating CalculatorEffective airflow loss from dryer duct length and elbows.
• Duct CFM CalculatorHow much air a duct can carry at a target velocity.
• Duct CFM from Velocity CalculatorAirflow from measured velocity and duct size.
• Duct Cross-Section Area CalculatorCross-sectional area of round or rectangular duct.
• Duct Friction Loss CalculatorPressure drop along a duct run.
• Duct Heat Gain CalculatorCooling season heat gain into ducts.
• Duct Insulation Heat Loss CalculatorHeat loss through duct insulation.
• Duct Insulation R-Value CalculatorHeat gain or loss through duct insulation.
• Duct Leakage CalculatorCFM25 leakage against code limits.
• Duct Leakage Percent CalculatorDuct leakage rate as a percent of system airflow.
• Duct Pressure Drop CalculatorFriction loss over a duct run.
• Duct Sheet Metal Weight CalculatorEstimate sheet metal duct weight.
• Duct Size by Tonnage CalculatorTrunk and return duct size from AC tonnage.
• Duct Size CalculatorRound and rectangular duct size for a target CFM.
• Duct Static Regain CalculatorStatic pressure regain at a duct expansion.
• Duct Surface Area CalculatorTotal surface area of a duct run.
• Duct Takeoff Size CalculatorSize a branch takeoff fitting from a trunk.
• Duct Traverse Points CalculatorNumber of equal-area traverse points for a round or rectangular duct.
• Duct Velocity CalculatorAir speed in a duct from CFM and duct size.
• Duct Velocity Noise CalculatorCheck duct velocity against noise limits.
• Dust Collection CFM CalculatorWorkshop dust collector sizing by machine.
• Dust Collector Main Duct CalculatorMain trunk sizing for a shared dust collection system.
• Elbow Equivalent Length CalculatorEquivalent duct length added by fittings.
• Electrical Room Ventilation CalculatorExhaust airflow to remove heat from an electrical/switchgear room.
• Electronics Enclosure Cooling CalculatorFan or AC sizing for a sealed electronics enclosure.
• Elevator Shaft Ventilation CalculatorVent area for an elevator hoistway per code.
• Engine Bay Airflow CalculatorRadiator airflow needed to reject engine heat.
• Equivalent Duct Diameter CalculatorRound equivalent of a rectangular or oval duct.
• Equivalent Round Duct Diameter CalculatorConvert rectangular duct to equivalent round.
• ERV / HRV Sizing CalculatorBalanced ventilation airflow for a home.
• ERV/HRV Balance CalculatorSupply/exhaust airflow balance for a heat/energy recovery ventilator.
• Evaporative Cooler Pad Area CalculatorPad face area needed for a swamp cooler's airflow.
• Evaporator Airflow Per Ton CalculatorCFM per ton for an evaporator coil.
• Exhaust Fan Operating Cost CalculatorAnnual electrical operating cost of an exhaust fan.
• Extended Plenum Size CalculatorSize an extended plenum trunk system.
• Fan Affinity Density CalculatorPressure and power correction for air density change.
• Fan Affinity Diameter CalculatorCFM, pressure and power from a fan wheel diameter change.
• Fan Affinity Speed CalculatorCFM, pressure and power from a fan speed change.
• Fan Annual Operating Cost CalculatorYearly electricity cost of running a fan.
• Fan Array CFM CalculatorTotal airflow and redundancy from a fan array.
• Fan Brake Horsepower CalculatorShaft power required to move air against a fan's static pressure.
• Fan CFM from RPM CalculatorApply fan law one to a speed change.
• Fan Curve Operating Point CalculatorFind where a fan curve meets a quadratic system curve.
• Fan Efficiency CalculatorTotal fan efficiency from airflow, pressure and power.
• Fan Energy Cost CalculatorRunning cost of a fan per day, month and year.
• Fan Inlet Velocity CalculatorAir velocity entering a fan's inlet cone or box.
• Fan Laws CalculatorNew CFM, pressure and power from a speed change.
• Fan Power CalculatorBrake horsepower and running cost of a fan.
• Fan RPM Change CalculatorRequired RPM to hit a target CFM.
• Fan Static Efficiency CalculatorStatic efficiency from CFM, static pressure and shaft power.
• Fan Static Pressure CalculatorSystem resistance a fan must overcome.
• Fan System Pressure Loss CalculatorTotal system pressure loss a fan must overcome across components.
• Fan Temperature Correction CalculatorCorrect fan pressure and BHP rating for high or low air temperature.
• Fan Total Efficiency CalculatorTotal (mechanical) efficiency from CFM, total pressure and power.
• Filter Grille Size CalculatorSize a return filter grille for low pressure drop.
• Filter Pressure Drop CalculatorFace velocity and pressure loss across an air filter.
• Fireplace Chimney Draft CalculatorTheoretical draft pressure for a masonry chimney.
• Flex Duct CFM CalculatorRealistic airflow through flexible duct.
• Flex Duct Equivalent Size CalculatorUpsize flex duct to match rigid duct capacity.
• Flex vs Rigid Duct CalculatorCompare pressure loss of flex versus rigid duct.
• Floor Register Size CalculatorSize a floor supply register.
• Flow Hood CFM CalculatorCorrect a balometer flow hood reading for its calibration factor.
• FPM to CFM CalculatorAirflow from measured velocity and duct area.
• FPM to m/s CalculatorFeet per minute to metres per second.
• Free Area Register CalculatorPercent free area and true velocity of a register.
• Fresh Air CFM per Person CalculatorOutdoor air rate for occupied spaces.
• Fume Hood Face Velocity CalculatorExhaust CFM from sash opening and face velocity.
• Fume Hood Sash Airflow CalculatorExhaust airflow for a lab fume hood by sash opening.
• Furnace Airflow CalculatorCFM and temperature rise for a furnace.
• Gable Fan CFM CalculatorPowered gable-mounted attic exhaust fan sizing.
• Gable Vent Size CalculatorGable vent area for attic ventilation.
• Garage Exhaust Fan Sizing CalculatorExhaust fan CFM for a residential garage.
• Garage Ventilation CFM CalculatorExhaust fan size for a garage or workshop.
• Generator Enclosure Ventilation CalculatorCooling airflow for an enclosed standby generator.
• Generator Room Ventilation CalculatorCombustion and cooling air for a standby generator room.
• Grease Duct Velocity CalculatorCheck grease duct velocity against code minimums.
• Greenhouse Evaporative Cooling CalculatorFan CFM for a pad-and-fan greenhouse cooling system.
• Greenhouse Heater BTU CalculatorHeating load for a greenhouse.
• Greenhouse Ventilation CalculatorExhaust fan sizing for a greenhouse.
• Grow Room Exhaust Fan CalculatorExtraction for a sealed or vented grow room.
• Grow Tent CFM CalculatorInline fan size for a grow tent with filter losses.
• Gym Ventilation CFM CalculatorOutdoor air for a gym or fitness studio.
• Heat Load CFM CalculatorVentilation needed to remove a watt or BTU heat load.
• Heat Pump Airflow CalculatorAirflow checks for a heat pump in both modes.
• HEPA Filter Airflow CalculatorFace velocity and airflow for a HEPA filter.
• HEPA Room ACH CalculatorNumber of HEPA units for a target ACH.
• High-Wall Register Size CalculatorSize a high sidewall supply register.
• Hood Static Pressure CalculatorTotal static for a hood exhaust system.
• Horse Stable Ventilation CalculatorAir changes per hour for a horse stable/barn.
• Hot Aisle Containment CalculatorReturn airflow needed for a contained hot aisle.
• Hot Wire Anemometer CFM CalculatorCFM from averaged hot-wire velocity readings at low speed.
• Humidifier CFM CalculatorDuct humidifier capacity from airflow and target RH gain.
• Humidity Ratio CalculatorGrains and pounds of moisture per pound of air.
• HVAC Tonnage Calculator by Square FootRough air conditioner size for a home.
• Hydrogen Room Ventilation CalculatorDilution ventilation for a hydrogen storage or battery charging room.
• Indoor Pool Dehumidification CalculatorMoisture load and dehumidifier CFM for an indoor pool.
• Inline Duct Booster Fan CalculatorSize an inline booster fan for extra duct run pressure loss.
• Island Hood CFM CalculatorExhaust airflow for an island kitchen hood.
• Isolation Room Air Changes CalculatorACH, exhaust and purge time for isolation rooms.
• Jumper Duct Size CalculatorSize a jumper duct to relieve a closed room.
• Kennel Ventilation CalculatorVentilation airflow for an animal kennel or boarding facility.
• Kiln Ventilation CFM CalculatorExhaust hood airflow for a pottery kiln.
• Kitchen Exhaust CFM CalculatorWhole-kitchen ventilation by air changes.
• Kitchen Exhaust Makeup Air Balance CalculatorBalance kitchen exhaust against makeup air supply.
• Kitchen Makeup Air CalculatorMakeup air for a large range hood.
• L/s to CFM CalculatorConvert litres per second to CFM.
• Laminar Flow Hood CFM CalculatorAirflow for a clean bench or flow hood.
• Laser Cutter Exhaust CalculatorExhaust airflow for a CO2 or fiber laser cutter.
• Latent Heat Load CalculatorMoisture removal load from airflow and grain difference.
• Laundry Room Ventilation CalculatorExhaust airflow for a laundry room.
• Living Room CFM CalculatorSupply airflow for a living or family room.
• Loading Dock Ventilation CalculatorExhaust airflow for an enclosed loading dock area.
• m/s to FPM CalculatorMetres per second to feet per minute.
• m³/h to CFM CalculatorConvert cubic metres per hour to CFM.
• Make-Up Air CFM CalculatorReplacement air for powerful exhaust fans.
• Makeup Air Heating Load CalculatorHeating capacity needed to temper makeup air.
• Manual D Friction Rate CalculatorDesign friction rate for duct sizing.
• Marine Cabin Ventilation CalculatorBlower CFM for a boat cabin or engine compartment.
• MERV Filter Airflow CalculatorAirflow penalty from a higher MERV filter.
• Mini Split Head Airflow CalculatorCFM output for a ductless mini split head by BTU.
• Motor HP to CFM CalculatorEstimate achievable CFM from available motor horsepower.
• Mushroom House Ventilation CalculatorFresh air exchange for a mushroom fruiting room.
• Natural Ventilation Opening CalculatorWindow area for natural ventilation.
• NC Rating Estimate CalculatorEstimate an NC noise criterion rating from an overall dBA level.
• Negative Pressure Kitchen CalculatorNet pressure differential for a commercial kitchen.
• Negative Pressure Room CalculatorExhaust offset needed to hold a room negative.
• Noise Attenuation with Distance CalculatorSound level drop-off from a fan or equipment as distance increases.
• Office Ventilation CFM CalculatorTotal and outdoor airflow for an office.
• Orifice Plate Flow CalculatorAirflow from an orifice plate differential pressure reading.
• Oval Duct Size CalculatorFlat oval duct equivalent diameter and size.
• Paint Booth Air Changes CalculatorBooth airflow from cross-draft velocity.
• Paint Booth Face Velocity CalculatorCross-draft or downdraft face velocity for a paint booth.
• Paint Tent CFM CalculatorExhaust airflow for a portable spray paint tent.
• Parallel Fans CFM CalculatorCombined airflow of identical fans running in parallel.
• Parking Garage Ventilation CalculatorCode airflow for an enclosed parking garage.
• PC Case Airflow CalculatorCase fan CFM for a PC build.
• PC Case Pressure Balance CalculatorIntake vs exhaust airflow balance for a PC build.
• PC Fan CFM to m3/h CalculatorConvert a computer/case fan's CFM rating to cubic meters per hour.
• Pet Grooming Room Ventilation CalculatorExhaust airflow for a pet grooming or drying room.
• Pitot Tube Traverse CalculatorAverage duct velocity and CFM from multiple pitot readings.
• Pizza Oven Hood Exhaust CalculatorExhaust hood airflow for a wood or gas pizza oven.
• Plenum Cross-Section CalculatorSupply plenum cross-section from air handler CFM.
• Pool Dehumidification CFM CalculatorEvaporation load and airflow for an indoor pool.
• Portable AC Sizing CalculatorBTU sizing for a portable air conditioner.
• Poultry Barn Ventilation CalculatorMinimum and tunnel ventilation CFM for a poultry house.
• Propeller Fan CFM CalculatorFree-air CFM of a propeller (axial) fan from disk area and velocity.
• Pulley & Sheave Size CalculatorDriven sheave size for a target fan RPM.
• PWM Fan Speed CalculatorEstimated fan RPM and airflow from a PWM duty cycle.
• Rack Cooling Airflow CalculatorPer-rack CFM for a server cabinet.
• Radiator Fan CFM CalculatorElectric cooling fan sizing for an engine.
• Radon Fan CFM CalculatorSub-slab depressurisation fan sizing.
• Radon Fan Power CalculatorElectrical operating cost of a sub-slab radon mitigation fan.
• Raised Floor Tile Airflow CalculatorPerforated tile count for a rack row.
• Range Hood CFM CalculatorKitchen hood size by cooktop width and type.
• Rectangular Duct Area CalculatorArea and aspect ratio for rectangular duct.
• Rectangular Duct Aspect Ratio CalculatorCheck a rectangular duct's aspect ratio.
• Reducing Trunk Duct CalculatorStep down trunk size after each branch takeoff.
• Refrigeration Condenser Airflow CalculatorAir-cooled condenser CFM from heat of rejection.
• Register Boot Size CalculatorSize a duct boot transition to a register.
• Register Face Velocity CalculatorGrille face velocity and noise check.
• Register Size CalculatorSupply register size from CFM and face velocity.
• Register Spread CalculatorLateral spread angle of a supply register.
• Register Throw CalculatorEstimate register throw distance from velocity.
• Restaurant Dining Ventilation CalculatorOutdoor air CFM for a restaurant dining room.
• Restaurant Exhaust CFM CalculatorCommercial kitchen hood exhaust airflow.
• Retail HVAC Load CalculatorSupply airflow for a retail sales floor.
• Return Air Duct Size CalculatorReturn grille and duct size for your airflow.
• Return Air Duct Sizing CalculatorCentral return duct size from system CFM.
• Return Air Grille Size CalculatorReturn grille size from return CFM.
• Ridge Vent Airflow CalculatorPassive exhaust airflow through a ridge vent by stack effect.
• Ridge Vent Length CalculatorRidge vent run to balance attic intake.
• Roof Ventilation CalculatorNet free area for intake and exhaust vents.
• Room Air Change Check CalculatorCheck a room's air changes per hour from CFM.
• Room CFM CalculatorSupply CFM a room needs from its square footage.
• Round Duct Area CalculatorCross-sectional area of a round duct.
• RV Vent Fan CFM CalculatorRoof vent fan size for an RV or van.
• RV/Van Ventilation CalculatorRoof fan and intake CFM for a camper van conversion.
• Salon & Nail Bar Ventilation CalculatorSource-capture and dilution exhaust for a nail salon.
• Sauna Ventilation CalculatorFresh air exchange rate for a sauna room.
• SCFM to ACFM (Fan) CalculatorConvert standard CFM to actual CFM at fan operating conditions.
• SCFM to ACFM CalculatorStandard to actual cubic feet per minute.
• Sensible Heat Airflow CalculatorCFM needed for a sensible heat load.
• Sensible Heat Ratio (SHR) CalculatorSplit total cooling into sensible and latent.
• Series Fans Pressure CalculatorCombined static pressure of identical fans in series.
• Server Room Cooling CalculatorCooling tonnage and airflow for IT load.
• Server Room Exhaust CalculatorExhaust/supply airflow for a small server or IT closet.
• Sheave Ratio CalculatorDriven RPM from motor and sheave sizes.
• Shop Dust Collector Sizing CalculatorCollector CFM for a woodshop machine list.
• Smoke Heat Exhaust Fan CalculatorSmoke and heat vent airflow for a large-area building.
• Smoking Room Ventilation CalculatorExhaust airflow for a designated smoking room.
• Soffit Vent CalculatorHow many soffit vents your intake needs.
• Solder Fume Extractor CFM CalculatorLocal extraction airflow for a soldering station.
• Sones to dBA Estimate CalculatorApproximate A-weighted sound level from a sone rating.
• Specific Fan Power CalculatorSFP in W/(L/s) or W/CFM for system efficiency comparison.
• Spiral Duct Size CalculatorRound spiral duct size from CFM.
• Spot Exhaust Energy Cost CalculatorAnnual conditioned-air cost of a spot exhaust fan.
• Spray Booth CFM CalculatorBooth airflow from cross-draft face velocity.
• Spray Booth Filter Velocity CalculatorFilter face velocity for paint booth intake or exhaust filters.
• Squirrel Cage Fan CFM CalculatorEstimate CFM output of a squirrel-cage (forward-curved) blower.
• Stack Effect CalculatorPressure difference from indoor-outdoor temperature.
• Standard Cubic Meters Per Minute CalculatorConvert actual CFM to standard cubic meters per minute (SCMM).
• Static Pressure CalculatorTotal external static pressure health check.
• Steam Room Ventilation CalculatorExhaust airflow for a commercial steam room.
• Supply Air Temperature Rise CalculatorFurnace temperature rise from CFM and BTU.
• Supply Register Count CalculatorHow many supply registers a room needs.
• Supply Register Sizing CalculatorHow many registers and what size for a room.
• Supply/Return Ratio CalculatorCheck supply-to-return airflow balance.
• Swamp Cooler CFM CalculatorEvaporative cooler sizing by air changes.
• System Curve Resistance CalculatorSystem curve coefficient and pressure at any flow.
• Telecom Closet Cooling CalculatorCooling capacity for a telecom or IDF closet.
• Theatre HVAC Load CalculatorCooling airflow for a theatre or auditorium by occupancy.
• Toilet Room Exhaust CalculatorExhaust CFM for a standalone toilet or powder room.
• Tons to CFM CalculatorAirflow needed for a cooling tonnage.
• Total Equivalent Length CalculatorSum straight duct length and fitting equivalents.
• Total External Static Pressure CalculatorTESP from supply and return readings.
• Total vs Static Pressure CalculatorSplit total pressure into static and velocity components.
• Transfer Grille Size CalculatorSize a transfer grille for a closed-door room.
• Trash Room Exhaust CalculatorExhaust airflow for a refuse or trash compactor room.
• Trunk Duct Size CalculatorMain trunk duct size from total CFM.
• Tunnel/Mine Ventilation CalculatorFan airflow for tunnel or mine ventilation by workers and diesel equipment.
• UPS Room Ventilation CalculatorCooling and hydrogen-safe ventilation for a UPS room.
• Vacuum CFM CalculatorAirflow and pipe size for a vacuum system.
• VAV Box Sizing CalculatorVAV box size, minimum flow and reheat.
• Velocity Pressure CalculatorVelocity pressure and equivalent velocity from a pitot reading.
• Velocity Pressure to FPM CalculatorConvert pitot velocity pressure to air speed.
• Venturi Flow CalculatorAirflow from a venturi meter's throat differential pressure.
• Vertical Farm Airflow CalculatorPer-tier airflow for a vertical farming rack.
• Vet Clinic Ventilation CalculatorAir changes for a veterinary clinic kennel/exam area.
• VFD Energy Cost Savings CalculatorAnnual dollar savings from adding a VFD to a fan.
• VFD Speed vs Power Savings CalculatorPower reduction from slowing a fan with a VFD.
• Walk-In Cooler CFM CalculatorEvaporator airflow for a walk-in cooler.
• Walk-In Freezer CFM CalculatorEvaporator airflow for a walk-in freezer.
• Wall Canopy Hood CFM CalculatorExhaust airflow for a wall-mounted canopy hood.
• Warehouse Ventilation CFM CalculatorAir changes and fan count for a warehouse.
• Water Heater Vent Sizing CalculatorVent pipe diameter for a gas water heater.
• Welding Booth Ventilation CalculatorLocal exhaust airflow for a welding booth.
• Welding Fume Extraction CFM CalculatorCapture airflow for a welding hood or arm.
• Wet Bulb Temperature CalculatorWet bulb from dry bulb and relative humidity.
• Whole House Fan CFM CalculatorFan size and attic vent area for whole-house cooling.
• Wind Pressure on Vent CalculatorWind-driven pressure and natural ventilation flow.
• Wine Cellar Cooling CalculatorBTU/hr sizing for a wine cellar cooling unit.
• Woodshop Branch Duct CFM CalculatorBranch duct sizing for one woodshop dust collection machine.
• Workshop Exhaust Fan CalculatorGeneral exhaust airflow for a home workshop.
• Yoga Studio Ventilation CalculatorOutdoor air CFM for a yoga or hot yoga studio.
• Zone Damper Size CalculatorZone damper size for a zoned duct system.

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