How many CFM do I need for my HRV?

How many CFM do I need for my HRV?

For continuous indoor air quality ventilation, a heat or energy recovery ventilator (HRV or ERV) should provide 0.35 air changes per hour. This calculation must consider the complete occupied volume of the house. This rate can be more easily calculated by allowing 5 CFM per 100 square feet of floor area.

How many CFM do I need for ERV?

A typical ERV, though, can move 100 to 200 cubic feet per minute (cfm) of air. A typical house needs maybe 50 cfm (depending on which ventilation standard you go by). What many designers do is set the ERV to run intermittently, say 20 minutes out of each hour, to meet the ventilation needs of the house.

How do I choose an ERV?

How To Choose An Energy Recovery Ventilator

  1. Energy transfer rating– what percentage of outbound energy is transferred to inbound air?
  2. Cost-of-Ownership– how much does it cost per year to operate?
  3. Moisture transfer efficiency– does the system effectively manage moisture and not just heat?

How often should you run an ERV?

A common one is to have it run every hour for 20 minutes. If you want to get precise about it, you can have it run just enough each hour to get your air changes to the desired level.

Should I run my ERV all the time?

An ERV doesn’t need to. While the ERV contains a fan that’s less powerful than your HVAC fan, it’s still powerful enough to ventilate your entire home. The ERV fan can run all the time, providing more consistent ventilation. Efficiency: Compared to an HVAC blower fan, your ERV’s fan is less expensive to operate.

Which is better HRV or ERV?

The best option between an HRV and an ERV depends on your climate and specific needs. If your house is too humid in winter (above 60% RH) then an HRV is the better choice, as it would surely get rid of excess humidity while an ERV would tend to keep it at a high level.

Is HRV or ERV better?

When Your Home Was Built: ERVs are recommended for homes built prior to the 1970s that usually have drier indoor air, because their construction allows humidity to escape outdoors. HRVs are good for more airtight newer homes.

How many CFM do I need for my HRV? For continuous indoor air quality ventilation, a heat or energy recovery ventilator (HRV or ERV) should provide 0.35 air changes per hour. This calculation must consider the complete occupied volume of the house. This rate can be more easily calculated by allowing 5 CFM per 100…