AirKing Lasko B-Air Blue-dri

Duct, Duct, Duct, Insulate – Insulating Your Ductwork

Have you ever taken a shower and the mirror starts to fog up? For almost all of us, we have experienced this at least one time in our life, probably more often than not. You might open a window, wipe it down with a towel, or think to yourself that you need a better exhaust fan (Air King can help with that!). What a lot of people don’t think about is that same steam that is causing your mirror to fog over is also going through your ducting. This presents a prime opportunity for condensation to form within your ducting. Condensation in the ductwork forms when the hot steam from the shower passes through the cooler ducting, causing the steam (water vapor) to turn into a liquid form (water). This is especially true in cooler climates of the country. A very simple fix is insulating your ductwork as well as placing insulation around and on top of the actual exhaust fan (make sure to check the rating of your exhaust fan as to how much insulation can be placed on top of it. Generally fans are rated for at least an R40 factor). By insulating your ductwork it does not allow the air flowing through it to cool fast enough to cause condensation.

What is the big deal with condensation? Condensation can be harmful in many ways. Anytime you have sitting water, the potential for mold and bacteria growth exists, so you are working against one of the main reasons you have an exhaust fan in the first place. Another issue is depending on the situation you could cause enough condensation to form that it starts to drip out of your fan and possibly cause damage to the ceiling material around the fan.

Air King, as well as the Home Ventilation Institute and ENERGY STAR® all strongly recommend that insulated ducting be used with all exhaust fans, so take a minute and check to see if your fan’s ducting is insulated or not. Your fan’s ducting will thank you!

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