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RED Calc Free Help Ventilation Elec Usage
Ventilation Electrical Usage Tool User Guide

Ventilation Electrical Usage
Red Calc Tool User Guide

What this tool can do for you

This tool allows you to easily calculate the annual electrical cost of operating a ventilation fan that is set up for continuous or intermittent use. If the fan is set up for intermittent use, you will need to know the operating schedule in order to calculate the annual motor operating cost.

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Calculated values

  • Annual electrical cost.
  • Annual electrical usage.
  • Annual usage time.

Tips

  • Clicking the label for any input or result will cause a popup help box to appear. This help box includes the allowed and normal values (for inputs). Read more.
  • Keep in mind the CFM/W (m3/min/W) when you are selecting a fan; the higher this value, the better. This is called the efficacy level.
  • If the homeowner turns the fan off when the dwelling windows are open, do your best to estimate this fan-off time and include it in your input values for the Ventilation Electrical Usage tool.

Inputs and field measurements

  • Power rating - from fan nameplate or manufacturer's specifications.
  • Days per year in use - from programmed controller or homeowner.
  • Hours per day in use - from programmed controller or homeowner.
  • Minutes per hour in use - from programmed controller or homeowner.
  • Average cost per kWh - from utility bill.

Background

When installing a ventilation fan, especially one that will operate most of the time, it is important to consider the cost of running the motor. If the fan you are using meets EnergyStar standards (see table below), the energy used and the cost of operating the fan will be as low as possible.

References

  • EnergyStar Program Requirements for Residential Ventilating Fans.
    Comment: The table below gives the criteria for EnergyStar qualified residential ventilating fans:
  • "The mission of the Home Ventilating Institute (HVI) is to serve consumers and members by advancing residential ventilation for healthy, energy-efficient homes. HVI is a nonprofit association offering a variety of services for manufacturers including, but not limited to, test procedures, certification and verification programs for airflow, sound and energy performance, and market support."
    Comment: This is a great resource for finding ventilation fans and related information.

Related tools

  • ASHRAE 62.2-2013 Ventilation: Determine whole-building ventilation requirements for new and existing dwellings, with the choice of using advanced blower door options and the alternative compliance path.
  • ASHRAE 62.2-2010 Ventilation: Determine whole-building ventilation requirements for new and existing dwellings, with the choice of using advanced blower door options and the alternative compliance path.

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