Design Rules of Thumb
The design rules below are intended for informational purposes only. They are based on new home construction using the latest technologies and standards. One should have a heat loss calculation done by a professional to insure a proper system is designed.
North Itasca Electric is able to help you in these calculations. If you desire assistance, call 1-800-762-4048 or 218-743-3131 Monday thru Friday 8:00 AM to 4:30 PM (Winter hours) or Monday thru Friday 7:00 AM to 3:30 PM (Summer hours).
Plenum Heaters:Plenum heaters can be sized using 8 to 10 watts per square foot with 8 foot ceilings.
A minimum air flow of 1000 CFM's is needed for 15 kW plenum heaters with proper ductwork installed and about 10 registers.
A minimum air flow of 1200 CFM's is needed for 20 kW plenum heaters with proper ductwork installed and about 12 registers.
Steffes Furnace:The sizing of brick storage units receiving 8 hours of charge each day:
Square foot Method:
Cubic foot method:
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