Heat Recovery Ventilator

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Broan HRV1150H Heat Recovery Ventilator 1150 cfm    US $3,350.00

American Aldes HRV300DDD Heat Recovery Ventilator    US $1,729.00

Fantech Heat Recovery Ventilator Model SHR 3005R    US $1,633.88

Broan HRV100H Heat Recovery Ventilator 135 cfm    US $1,025.00

Broan HEPA Filtration Heat Recovery Ventilator GSHH3K    US $1,021.88

Fantech Heat Recovery Ventilator Model SHR 1505R    US $972.88

American Aldes HRV 155SRD Heat Recovery Ventilator    US $969.88

Aldes LT 20 Heat Recovery Ventilator    US $947.88

MECHANICAL VENTILATION HEAT RECOVERY 3500sqft MITSUBISHI LOSSNAY MVHR EXTRACTION    US $853.50

Nu Air Heat Recovery Ventilator ES170    US $955.00

Fantech Heat Recovery Ventilator Model SHR1504 New    US $799.00

A NEW Fantech Heat Recovery Ventilator Model VHR704R    US $757.00

Nu Air Heat Recovery Ventilator ES100    US $806.00

Fantech Heat Recovery Ventilator Model VHR1404 New    US $729.00

Honeywell ER150C2004 Energy Recovery Ventilator Fresh Air Heat Recovery System    US $527.99

DreamAire 5000 Heat Recovery Ventilator with ESP Filter    US $499.00

BEAT ANY PRICE Heat Recovery Fan Ventilation Condensation Vent Axia Manrose    US $251.33

Whole House In Line Heat Recovery ventilation System KIT Controls Condensation    US $251.33

Greentek professional fifth port heat recovery ventilator HRV    US $250.00

Insulated Ducting HEAT RECOVERY VENTILATION Grow Room    US $31.61

Air Vent Ceiling Grill Outet Inlet Heat Recovery Ventilation Fan 8 200mm dia    US $17.07

I thought I should let you read the Patent of an electronically commutative motor....!! LOL http://www.freepatentsonline.com/5457366.html Now lets try this in English: Imagine a "standard" forced air heating system. The fan motor is either "On" of "Off", right? But this is often not necessary, and the noise can be annoying. An electronically commutative motor (ECM) is - as you suspect - very much a "basic electromagnetic motor", but it is controlled by an electronic circuitry which takes readings from sensors and "decides" how fast the fan motor *really needs* to turn, and then controls the motor speed accordingly. This saves electricity, increases the (power-) efficiency of the whole system, and cuts down on humming noise as well.... But as so often with these "good things", you have to spend money upfront (for the control electronics), in order to save a few dollars over the coming years.....