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re: MERV level on home AC filters in South Louisiana
Posted on 5/20/24 at 12:21 pm to CrawDude
Posted on 5/20/24 at 12:21 pm to CrawDude
quote:
The system has to work harder, blower motors, etc to overcome resistance to airflow with a restrictive filter.
Well, not as much work harder, just you won't get the effective air flow and run the risk of icing the evaporator. Most systems have the blower after the filter so a dirty or restrictive high-MERV filter will actually have the blower motor drawing less amps (air flow is a load for any fan). My upstairs blower with a brand new FPR 7 filter draws about ~511 W, when the filter is due to be changed it will draw around 490 W.
1
Posted on 5/20/24 at 12:37 pm to Clames
quote:
so a dirty or restrictive high-MERV filter will actually have the blower motor drawing less amps (
For old school PSC blowers, that is true. For modern ECM motors, restrictive filters will result in much higher blower motor power consumption to the point of causing the motor to burnout and die early. Undersized ductwork with ECM blowers also has the same issue.
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