Cfm volts x amps x 3 412 δt x 1 08 δt f volts amps.
Electric duct heater sizing calculator.
This hvac calculator is the closest estimate to the actual manual j calculation done by hvac pros.
Multiply that result by the temperature increase you calculated in step 3.
Face area h 2 5 w 0 5 144 in2 ft2 12 2 5 24 0 5 144 in2 ft2 1 53 ft2.
Calculate the btus you need.
Rounding up this means that 7 feet or 84 inches of heater is needed.
Take the guesswork out of garage heater sizing.
Calculate the duct size by using a duct calculator.
Use our heater sizing charts to determine what garage heater is right for you.
This hvac load calculator quickly estimates the size of your heating and cooling system in btu s.
The heat load estimate is based on your climate region total square footage number of rooms or zones you want ceiling height insulation type number of windows and doors.
An example of calculating the minimum air velocity needed.
A one kw heater will produce 3 413 btu s per hour.
Given all the different options available for heaters space vented gas console and more narrowing down the choices can be a great way to ensure that you are choosing the best option.
When shopping for heaters many people make the mistake of choosing the wrong size for their actual needs.
1 electric heat temperature rise method.
If a room is 250 square feet the result will be a duct size of 8 inch round.
Cfm btu s δt x 1 08 input.
Enter any two parameters to get the third.
Standard heaters are not available in this length so in this case a single 8 foot or two 4 foot heaters would be the likely choice.
The result rounded off to the nearest thousand is the total btus or heater size you need.
In the example this would be 40 000 btus.
Answer a few questions about your energy source and garage and the garage heater calculator free tool recommends models that will do the job.
You can also do this by checking for them online or by using a manual that is sold by distributors.
Our free garage heater calculator takes the guesswork out of selecting a garage heater.
Heater selection sizing determining the size of your duct heater.
If you know the cfm of your air handler and the temperature rise needed you can use the chart below to approximate the kilowatt rating of the duct heater needed for your application.
Rise f δt volts amps.
