Before installing an attic fan, it is crucial to check for moisture presence in walls. This can be done with a moisture meter or a simple test:
**Materials:**
* 1 square foot of clear plastic
* Tape
**Procedure:**
1. Tape the plastic to the wall surface, ensuring no air gaps.
2. Leave the plastic in place for 24 hours.
3. If condensation forms on the underside of the plastic, moisture is present in the wall.
Attic fans offer numerous advantages, including:
* **Temperature regulation:** They circulate hot air out of the attic, reducing overall cooling costs and discomfort in upper-level rooms.
* **Humidity control:** By removing moisture from the attic, attic fans help prevent mold and mildew growth and associated health issues.
* **Energy efficiency:** They can supplement air conditioning systems, reducing energy consumption and utility bills.
* **Extended roof life:** Dry attics prolong the life of roofing materials by preventing rot and warping.
* **Improved air quality:** Attic fans remove stale air and odors, creating a healthier living environment.
There are two main types of attic fans:
* **Powered attic fans:** These use electricity to blow hot air out of the attic. They are generally more effective than passive fans but require professional installation.
* **Passive attic fans:** These rely on natural convection currents to move air. They are less expensive and easier to install but may not be as effective as powered fans.
When selecting an attic fan, consider the following factors:
* **Size of the attic:** The fan’s CFM (cubic feet per minute) rating should be appropriate for the attic’s square footage.
* **Type of insulation:** If the attic has blown-in insulation, a hood-mounted fan is recommended to avoid disturbing the insulation.
* **Ventilation openings:** Adequate ventilation openings are necessary for proper airflow.
* **Professional installation:** It is highly recommended to hire a professional electrician or HVAC contractor for proper installation and wiring.
To keep an attic fan functioning optimally, regular maintenance is essential:
* **Clean the fan blades:** Regularly remove dust and debris from the fan blades to ensure proper airflow.
* **Lubricate the fan motor:** Follow the manufacturer’s instructions for lubricating the fan motor according to the recommended schedule.
* **Check electrical connections:** Inspect electrical connections for tightness and corrosion, especially after heavy storms or power outages.