Aprilaire 400M Humidifier Bypass<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Manual Drainless Bypass Humidifier </span></li><li><span class="a-list-item"> Humidifies a tightly-constructed home of up to 4，000 square feet </span></li><li><span class="a-list-item"> The Aprilaire 400M Humidifier includes a built-in bypass damper that is conveniently labeled for winter and summer settings </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/4106dNdXMZL.jpg" noproxy>