Project Junkeez

Bathroom exhaust fans are not optional if you want a healthy, lasting space. Bathrooms produce a lot of moisture, and without proper ventilation, humidity lingers on ceilings, walls, mirrors, and trim. This creates the perfect conditions for mold, mildew, peeling paint, and even wood rot.

Industry standards recommend sizing your fan based on the square footage of your bathroom. Typically, this is about 1 CFM per square foot. A 7 by 10-foot bathroom needs at least 70 CFM, while larger spaces often require 100 to 150 CFM or multiple fans to handle higher moisture loads.

Exhaust fans must vent directly to the outside. Venting into an attic or crawlspace allows moisture to accumulate in insulation and framing, which causes hidden mold and structural issues over time. Correct fan sizing and installation protect your home’s structure and indoor air quality.

We will cover more about fan selection, placement, and moisture control in our upcoming podcast.