Heater selection sizing determining the size of your duct heater.
Electric duct heater sizing calculator.
Rise f δt volts amps.
An example of calculating the minimum air velocity needed.
When shopping for heaters many people make the mistake of choosing the wrong size for their actual needs.
Cfm btu s δt x 1 08 input.
If a room is 250 square feet the result will be a duct size of 8 inch round.
Answer a few questions about your energy source and garage and the garage heater calculator free tool recommends models that will do the job.
Use our heater sizing charts to determine what garage heater is right for you.
You can also do this by checking for them online or by using a manual that is sold by distributors.
Face area h 2 5 w 0 5 144 in2 ft2 12 2 5 24 0 5 144 in2 ft2 1 53 ft2.
In the example this would be 40 000 btus.
Calculate the btus you need.
Calculate the duct size by using a duct calculator.
Our free garage heater calculator takes the guesswork out of selecting a garage heater.
Enter any two parameters to get the third.
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.
This hvac load calculator quickly estimates the size of your heating and cooling system in btu s.
A one kw heater will produce 3 413 btu s per hour.
Rounding up this means that 7 feet or 84 inches of heater is needed.
1 electric heat temperature rise method.
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.
First multiply by 133 the total cubic feet of area determined in step 2.
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.
A 25 kw open coil duct heater is to be installed in a duct that is 12 inches high by 24 inches wide.
The result rounded off to the nearest thousand is the total btus or heater size you need.
Cfm volts x amps x 3 412 δt x 1 08 δt f volts amps.
