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Fan power is measured by CFM, or cubic feet per minute. For every 1,000 feet of square footage in your attic, you need a minimum of 700 CFM. Steeper roofs may need larger fans or about 840 CFM.  You can figure the size of attic fan you need by multiplying the square footage of your attic floor by 0.7. (multiply by 1.2 for a steep roof and 1.15 for a dark roof). That number is the CFM required for your fan to run efficiently.

Stainless steel or aluminum fans are long-lasting and have less air resistance. They are best for outdoor use as their durability helps them withstand unpleasant weather conditions. Their heavy weight requires a stronger motor, which leads to more noise than other blade materials.

Wooden fan blades are a classic, durable option. They are much quieter than metal fans and feature a wide range of styles and finishes to choose from. However, they can be damaged by moisture if not covered with plastic.

Plastic fan blades are lightweight, easy to clean, and versatile. There are various shapes and styles to choose from as plastic is easily molded and dyed. They will also deteriorate slower than other materials as they aren’t as susceptible to humidity and moisture.

If you’re removing a ceiling fan without visible screws, start by locating the fan canopy—a round cover placed above the fan blades and motor. There should be a thin ring that can be turned counterclockwise to remove the canopy and reveal the screws. After unscrewing the fan, you can disconnect the wires and remove the entire fan from the mounting hardware. For safety, make sure the fan switch is turned off before you remove the canopy. It may be easier to remove the fan blades first, too.

A typical fan installation takes between two and six hours. The exact timeframe can be influenced by factors such as the home's structure, existing electrical characteristics, ease of attic access, and whether complex wiring or additional attic ventilation work is required.