Power Vent
An electrically powered exhaust fan installed on the roof or gable wall that actively pulls hot air from the attic. Controlled by a thermostat or humidistat that activates the fan when attic conditions reach a set threshold.
What Is a Power Vent
A power vent is an electrically powered attic exhaust fan, mounted on the roof or gable wall, that actively draws hot and humid air from the attic space when triggered by a built-in thermostat or humidistat, providing more aggressive ventilation than passive vents alone. Unlike static box vents or wind-driven turbine vents, a power vent operates on demand regardless of wind conditions, making it effective on still, hot days when passive ventilation provides minimal airflow.
Power Vent Damage
Power vents are vulnerable to hail damage (dented housing, broken fan blades), wind damage (displaced mounting), and lightning strikes (burned-out motor or thermostat). During a storm damage inspection, check the fan for free rotation, listen for bearing noise, and verify the thermostat activates the unit. A power vent that does not turn on may have a burned motor, tripped breaker, or damaged wiring, all of which are claimable if caused by a covered event.
Power Vents in Insurance Estimates
Power vent replacement in Xactimate includes the vent unit, electrical wiring, thermostat or humidistat, and the roof or gable flashing. Unlike passive vents, power vents require an electrical connection, so the estimate should include any wiring work needed. If the existing power vent was hardwired, the electrician cost to reconnect is a separate trade item. Document the existing vent type, location, and electrical configuration during the inspection so the estimate accurately reflects the replacement scope.
Frequently asked questions
A power vent is an electrically powered attic exhaust fan mounted on the roof deck or gable wall. It activates automatically when a thermostat or humidistat detects that attic temperature or humidity exceeds a set threshold. The fan pulls hot, moist air from the attic and exhausts it outside, with replacement air drawn in through the soffit vents.
If a power vent is damaged by a covered peril such as hail, wind, or lightning, replacement is covered. The estimate should include the vent unit, wiring, thermostat, and any roof or gable flashing required for installation. Each component is a separate line item in Xactimate.
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