There are no plastic parts to crack. Constructed with heavy-gauge aluminum and steel, all General blowers offer laboratory certified air flow rates from independent, third party, agency testing. Due to friction loss caused by air moving against the inside surface, air flow rates decrease as duct lengths increase. Configurations requiring additional duct length or drastic directional changes can result in substantially lower air flow rates. The key factor is the capacity differences between 8 inch and 12 inch diameter ducts.
Greater capacity means less friction loss.
The EP12AC matches the power of its motor against the high static capacity of the specially-designed propeller. This combination enables the EP12AC to better overcome friction losses and deliver higher air flow rates over longer duct lengths. The air flow rate, regardless of duct length, directly affects the total number of times per hour the atmosphere within a confined space can be properly recirculated. Federal OSHA regulations do not specify minimum air flow standards for blowers or an air recirculation requirement. However, many states have developed individual air recirculation standards that directly affect the final ventilation configuration, blower selection, duct length and even the number of blowers required.