Multiply that result by the temperature increase you calculated in step 3.
Electric duct heater sizing calculator.
Rise f δt volts amps.
The result rounded off to the nearest thousand is the total btus or heater size you need.
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.
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.
Rounding up this means that 7 feet or 84 inches of heater is needed.
1 electric heat temperature rise method.
You can also do this by checking for them online or by using a manual that is sold by distributors.
An example of calculating the minimum air velocity needed.
Face area h 2 5 w 0 5 144 in2 ft2 12 2 5 24 0 5 144 in2 ft2 1 53 ft2.
A one kw heater will produce 3 413 btu s per hour.
This hvac load calculator quickly estimates the size of your heating and cooling system in btu s.
This hvac calculator is the closest estimate to the actual manual j calculation done by hvac pros.
Use our heater sizing charts to determine what garage heater is right for you.
When shopping for heaters many people make the mistake of choosing the wrong size for their actual needs.
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.
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.
First multiply by 133 the total cubic feet of area determined in step 2.
A 25 kw open coil duct heater is to be installed in a duct that is 12 inches high by 24 inches wide.
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.
Calculate the duct size by using a duct calculator.
In the example this would be 40 000 btus.
Heater selection sizing determining the size of your duct heater.
Calculate the btus you need.
Cfm volts x amps x 3 412 δt x 1 08 δt f volts amps.
Take the guesswork out of garage heater sizing.
